Journal of Materials Research and Technology-JMR&T
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2020
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IF 5.289
Yufei Liu,Siyuan Jiang,Wei Yan,Jun Qin,Min He,Shuhao Qin,Jie Yu
In order to expand its application range in electronics and membrane industries, this paper aimed to develop polyamide 6 (PA6)/P ( N -(4-carboxyphenyl) maleimide-alt-triallyl isocyanurate) (PCT) composites with heat-resisting, thermally conductive and anti-moisture, by employing PCT as a reactive reinforcement material and applying irradiation for solid-state interfacial reaction (SSIR) between PCT and PA6. According to the results, the SSIR occurred between PA6 and PCT. Compared with non-SSIR PA6, the PA6/PCT composite with SSIR showed the highest heat resistance, thermal conductivity and anti-moisture absorption and its relative crystallinity ( X c ), glass transition temperature ( T g ), and heat deflection temperature ( HDT ), thermal conductivity and anti-moisture absorption were improved by 61.4, 24.0, 83.9, 18.5 and 40.2%, respectively. This is because that the chemical bond between the PCT surface and the PA6 matrix is formed by SSIR, which provides a theoretical basis either for the development of PA6 or other semi-crystalline polymers.
研究领域:
高分子材料科学
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材料工程
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Zhengqi Wang,Ai Liu,Yingying Li,Jianyong Yu,Ruchao Yuan,Faxue Li
In this study, a novel benzimidazole-modified phytate (PMI) was synthesized through the reaction of plant-derived phytic acid with benzimidazole derivatives, subsequently applied as an eco-friendly flame retardant for polyamide 6 (PA6). A series of flame-retardant PA6 composites (FR-PA6s) with different PMI loadings were prepared via melt-blending. The thermal stability, flame retardancy, and recyclability of these composites were systematically investigated through comprehensive characterization. Thermogravimetric analysis (TGA) indicated that PMI incorporation maintained the thermal degradation profile of PA6 while remarkably improving its char residue yield from 0% to 7.3% under air atmosphere. Particularly, the PA6/PMI-9 composite containing 9 wt% PMI demonstrated superior flame-retardant performance, achieving a limiting oxygen index (LOI) of 29.3% and attaining UL-94 V-0 rating with significant suppression of melt dripping. Cone calorimetry test results revealed substantial reductions in peak heat release rate (p-HRR, 40.4%) and total heat release (THR, 33.1%) compared with PA6, accompanied by the emergence of characteristic anti-dripping behavior in HRR profile. Notably, PMI exhibited excellent recyclability through a closed-loop recovery process achieving recovery efficiency of 62%. The recycled PMI (R-PMI) retained effective flame retardancy, as evidenced by comparable performance of re-blended composites (R-FR-PA6s) to their virgin counterparts. Especially, successful melt-spinning of PA6/PMI-9 into continuous filaments demonstrated its processability for textile applications. The enhanced fire safety originated from the formation of intumescent char layer that effectively isolates heat and oxygen, as well as free radical scavenging effect and NH 3 dilution effect in the gas phase. This multi-phase protection strategy provided new insights for developing sustainable flame-retardant polyamides.
研究领域:
高分子科学
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材料工程
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消防安全工程
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绿色化学
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纺织工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Xiaomin Luo,Jian Wang,Peng Zhang,Jianyan Feng,Xin Meng,Ka Li,Changyu Yin,Peng Wang,Lufeng Ji,Ying Liu,Zhilong Qiao
Nanofiltration membranes based on graphene oxide exhibit substantial potential for practical applications in water treatment, poised to lead the next generation of separation technology. It is noteworthy that the prominent hydration interaction among graphene–graphene oxide nanosheets stands as the primary factor influencing its stability. Simultaneously, the absence of suitable graphene substrates presents challenges to its large-scale production. In this study, our initial endeavor involved constructing a graphene-based selective layer on a PA6 substrate using a quasi-“rooting” strategy. The graphene selective layer was anchored onto the surface of PA6 fibers (with a diameter size of up to 190.0 mm and a selective layer thickness of approximately 5.0 µm). Experimental results reveal that the permeability of the hybrid graphene oxide/PA6 fiber composite nanofiltration membrane consistently maintained within the range of 7.7 to 14.9 L m⁻² h⁻¹ bar⁻ 1 , with a remarkable dye molecule removal rate of 99.06 %. Even under challenging operating conditions (such as strong acid, strong alkali, polar solvent, oxidation , and the coexistence of salt ions), its separation performance remained stable. The permeability of composite membranes was retained between 10.6 and 12.7 L m⁻² h⁻¹ bar⁻ 1 , and the rejection rate of CR dye reached 95.0 % under harsh conditions. Furthermore, the stability and anti-fouling performance of the composite membrane were significantly enhanced. Deposits on the membrane surface could be effectively removed through physical wiping and repeated water rinsing, maintaining membrane integrity even after vigorous ultrasonic cleaning (120 min, 950 W). Additionally, after undergoing 20 cycles of rinsing with deionized water and a 30-day soak in an aqueous solution, the PA6 substrate and graphene selective layer exhibited robust adhesion. No shedding was observed, and the dye rejection rate of the composite membrane consistently exceeded 95 %. This perfectly illustrates the exceptional structural stability and separation durability of the prepared separation membrane . Our work contributes fundamental design principles and theoretical insights for practical applications.
研究领域:
材料科学
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环境工程
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水处理
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纳米技术
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产品关联
DOI
高影响因子
Polymers
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2022
·Vol. 14
·期 18
·3888
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IF 4.967
Yingying Zhong,Qibei Bao,Lifeng Yuan,Jiawen Liu,Yan Cai,Xianfeng Chen
Microplastics are harmful to both marine life and humans. Herein, a pyrolysis–gas chromatography–mass spectrometry (Py-GC/MS) technique for the detection of microplastics in aquatic shellfish is demonstrated. The organic matter in aquatic shellfish was removed by alkali digestion. Subsequently, using hexafluoroisopropanol as the extraction solvent, the extraction method was optimized. The influence of the digestion process on the nature of microplastics was investigated by analyzing the samples before and after the alkali treatment via infrared spectrometry, laser particle sizing, and scanning electron microscopy. Spiked recovery experiments and an analysis of actual samples were performed using PA6 and PA66 as analytes. A quantitative analysis of the characteristic ion fragment produced by high-temperature cracking was performed after chromatographic separation and mass spectrometry identification. The linear range of this method for PA6 and PA66 was 2–64 μg. The limits of detection of PA6 and PA66 were 0.2 and 0.6 μg, while the limits of quantitation were 0.6 and 2.0 μg, respectively. Recovery ranged from 74.4 to 101.62%, with a precision of 4.53–7.56%. The results suggest that the Py-GC/MS technique is suitable for the analysis and detection of trace microplastics in aquatic shellfish.Keywords:microplastics;alkali digestion;pyrolysis–gas chromatography–mass spectrometry;aquatic shellfish;nylon
研究领域:
环境科学
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分析化学
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海洋生物学
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DOI
PubMed
高影响因子
POLYMER
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2024
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IF 4.1
Yu Gu,Jiahao Liu,Wei Gao,Meichen Liu,Chunwang Yi
The preparation of polyesteramides (PEAs) with regular block structure has long been a challenge, owing to the occurrence of the ester-amide exchange during the polymerization at high tempereture. In this work, we report a simple and green method to prepare polyamide 6 (PA6) based triblock PEA whose structure is poly(ε-caprolactone)-block-PA6-block-poly(ε-caprolactone) (PCL- b -PA6- b -PCL) using tetraphenyl tin as catalyst without solvent. The first segment PA6 was synthesized via cationic ring-opening polymerization (ROP) of ε-caprolactam (CPL), later, ROP of ε-caprolactone (CL) was involved to extend polycaprolactone (PCL) segments by using tetraphenyl tin as catalyst. By varying the proportion of CPL and CL, series PA6-based PEAs was prepared and characterized by gel permeation chromatography, 1 H, DOSY, and 13 C NMR. The results showed that PEA containing more proportion of CL presented a higher molecular weight with narrow polydisperse index. In particular, the lower water absorption and lower oligomers content infers that the PEA could have a prospective application in processing precision electronic devices.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Yue Zhou,Liupeng Zhao,Wei Tao,Tianshuang Wang,Peng Sun,Fangmeng Liu,Xu Yan,Geyu Lu
Sensing materials with fiber structures are excellent candidates for the fabrication of flexible pressure sensors due to their large specific surface area and abundant contact points. Here, an ultrathin, flexible piezoresistive pressure sensor that consists of a multilayer nanofiber network structure prepared via a simple electrospinning technique is reported. The ultrathin sensitive layer is composite nanofiber films composed of poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) and polyamide 6 (PEDOT:PSS/PA6) prepared by simultaneous electrospinning. PEDOT:PSS conductive fibers and PA6 elastic fibers are interwoven to form a multilayer network structure that can achieve ultrahigh sensitivity by forming a wealth of contact points during loading. In particular, gold-deposited PA6 fibers as upper and lower flexible electrodes can effectively increase the initial resistance. Due to this special fiber electrode structure, the sensor is able to generate a large electrical signal variability when subjected to a weak external force. The devices with different sensing properties can be obtained by controlling the electrospinning time. The sensor based on the PEDOT:PSS/PA6 nanofiber network has high sensitivity (6554.6 kPa–1 at 0–1.4 kPa), fast response time (53 ms), and wide detection range (0–60 kPa). Significantly, the device maintains ultrahigh sensitivity when cyclically loaded over 10,000 cycles at 5 kPa, which makes it have great prospects for applications in human health monitoring and motion monitoring.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 22
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IF 1.64
Yanyan Zhang,Hong Fan,Bo-Geng Li
Advance polyamide-6- b -polydimethylsiloxane (PA6- b -PDMS) multiblock copolymers were first synthesized via the polymerization in bulk. Binary carboxyl terminated PA6 was served as the hard segment and PDMS modified with hexamethylene diisocyanate (PDMS-NCO) was the soft segment. A series of PA6 -b- PDMS copolymers based on different content and length of soft segments were obtained. Interestingly, Differential scanning calorimetry (DSC) studies revealed no obvious change in melting temperature after introducing PDMS segments to copolymers. The high melting temperatures indicated these copolymers possess potential applications in automotive industry that require high continuous use temperatures. DSC and transmission electron microscopy studies both demonstrated increasing the length and the content of the soft segment contributed to increasing of the degree of microphase separation. However, the improvement of thermal stability resulting from PDMS segments was also observed by thermo gravimetric analysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41114.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2026
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IF 5.4
Wenxing Yuan,Rende Qin,Rongjie Lv,He Wang,Yongjie Yuan,Hailiang Zhang
A salt-based strategy enables PA6 copolymers with pyridine units in the backbone. • The incorporated pyridine groups provide intrinsic reactivity for surface quaternization. • Surface quaternization is achieved without polymer dissolution or harsh conditions. • Quaternized PA6/6P shows strong antibacterial activity with minimal loss of mechanics. Polyamide 6 (PA6) is widely used in textiles, automotive components, and consumer products due to its adequate mechanical strength, chemical resistance, and processability. However, conventional PA6 is prone to microbial colonization, leading to odor, material degradation, and potential health risks, which limits its application in hygiene-sensitive areas. Herein, we report a strategy to construct interface-activated antibacterial PA6 by integrating main-chain pyridine units with surface quaternization. A semi-aromatic pyridine-3,5-dicarboxylic acid/hexamethylenediamine salt was first synthesized in water with high yield and subsequently copolymerized with ε-caprolactam via hydrolytic ring-opening polymerization, affording PA6/6P copolymers with controlled molecular weight (relative viscosity 2.30–2.40) and good processability. Incorporation of rigid pyridine units enhanced chain rigidity and thermal stability (Td >390 °C) while maintaining favorable melt rheology and improved mechanical strength (tensile strength up to 78.6 MPa). Importantly, the embedded pyridine moieties served as intrinsic reactive sites for post-polymerization surface quaternization through a simple immersion in 1-bromooctane and ethanol, yielding quaternized q-PA6/6P materials. Surface analysis confirmed successful formation of immobilized pyridinium groups at the polymer interface. The resulting q-PA6/6P exhibited good contact-active antibacterial performance, with the 48 h quaternized sample almost completely inhibiting the growth of Staphylococcus aureus and Escherichia coli . Download: Download high-res image (135KB) Download: Download full-size image
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 15
·2300141
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IF 4.6
Tianqi Liang,Qiwen Huang,Zhaoyang Wei,Weiwei Lei,Jun You,Jie Liu,Xiaoming Ren,Qunchao Zhang,Guohua Hu,Dean Shi
In order to get stable co-continuous morphology in immiscible polymer blends, besides reducing the interfacial tension, the compatibilizer should not only promote the formation of flat interface between different phases, but also not hinder the coalescence of the dispersed phase. Herein, the relationship between the morphology of the compatibilized polystyrene/nylon 6/styrene-maleic anhydride (PS/PA6/SMA) immiscible polymer blends and the structures of the in-situ formed SMA-g-PA6 graft copolymers as well as the processing conditions are studied. Two kinds of SMA are used: SMA28 (28 wt.% MAH) and SMA11 (11 wt.% MAH). After melt blending with PA6, the in-situ formed copolymer SMA28-g-PA6 has on average of four PA6 side chains, while that of SMA11-g-PA6 has only one. Dissipative particle dynamics simulation results indicate that both SMA28-g-PA6 copolymer and PS/PA6/SMA28 blends tend to form co-continuous structure, while those related to SMA11 intend to form sea-island morphologies. These results are correct only at relatively low rotor speed (60 rpm). When the rotor speed is higher (105 rpm), sea-island morphologies are obtained in SMA28 systems, while that for SMA11 ones are co-continuous. This indicates that higher shear stress can elongate the minor phase domains to form flat interfaces, while the SMA28-g-PA6 copolymers can be pulled out from the interface.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
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2026
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IF 3.6
Rongrong Shen,Junjie Ge,Jing Zhou,Haihong Ma,Zhengfa Zhou,Weibing Xu,Fengmei Ren
Owing to its high strength and lightweight characteristics, polyamide 6 (PA6) is widely used in the field of engineering plastics. However, the relatively low heat deflection temperature (HDT) of PA6 constrains its application in high-temperature environments, particularly in electric vehicle charging infrastructure and related functional components. In this study, a composite filler with high surface roughness was prepared by combining sepiolite (SEP) fibers and nano-montmorillonite (MMT) via a simple, environmentally friendly physical electrostatic adsorption method. Modified composite filler was prepared via surface treatment with the silane coupling agent. The composite materials were prepared through melt compounding with PA6, with a maleic anhydride grafted ethylene-based elastomer used as a compatibilizer. Compared with composites reinforced with the modified single SEP filler, those prepared with the modified composite filler exhibited significantly improved thermal and mechanical properties. When the nano-montmorillonite content was 1.5 wt%, the HDT of the composite containing SEPM-1.5 reached 172°C, which was 24°C higher than that of the composite containing only SEP, while the flexural strength and flexural modulus reached 145 and 5200 MPa, which increased by 31% and 38%, respectively. Non-isothermal crystallization kinetics analysis revealed that the micro-nano composite structure of SEP and MMT accelerated the ordered arrangement of PA6 molecular chains through heterogeneous nucleation, significantly increased the crystallization rate, and thus improved the material properties. Highlights Green electrostatic assembly of sepiolite and nano-MMT makes composite filler. Rough filler surface improves interfacial interlocking and PA6 insulation. Composite filler acts as nucleating agent to accelerate PA6 crystallization.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiajun Du,Hao Shi,Xin Wang,Meiling Xiang,Jing Zhang
The emerging demands of the low-altitude economy necessitate structural materials that simultaneously achieve lightweight design, mechanical robustness, electromagnetic interference (EMI) shielding, and thermal management—capabilities rarely coexisting in conventional composites. Although polyamide 6 (PA6)/basalt fiber (BF) composites offer sustainability and high specific strength, their practical application is severely limited by weak fiber–matrix interfacial adhesion and intrinsic electrical insulation, resulting in poor EMI shielding and thermal transport capability. Herein, a noble-metal-free, self-catalytic electroless copper plating strategy is reported to functionalize basalt fibers and fabricate laminated PA6/Cu@BF composites with synergistic structural–functional integration. A uniform and compact three-dimensional conductive copper layer was constructed in situ on the BF surface without palladium activation, providing continuous electrical pathways and micro/nanoscale surface features that significantly enhanced interfacial wetting and adhesion with the PA6 matrix. As a result, the composite exhibited an ultrahigh average EMI shielding effectiveness of 85.6 dB in the X-band at a thickness of only 0.6 mm. Benefiting from the reinforced interface, the impact strength increased by 253.4% compared with the unmodified composite. In addition, the interconnected copper network enables enhanced in-plane thermal transport (80.2% improvement) and rapid Joule heating, reaching 98.5 °C within 30 s under a low voltage of 3 V, demonstrating strong potential for fast de-icing and localized thermal regulation. This work provides a sustainable, low-cost, and scalable strategy for simultaneously enhancing interfacial integrity and multifunctional performance of PA6/BF composites, offering a promising structural–functional integrated material platform for low-altitude aerial systems.
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 23
·47630
·
IF 2.188
Liang Wang,Wei Wu,Dietmar Drummer,Renbo Ma,Zhaowen Liu,Wanting Shen
To develop thermally conductive PA6 composites with the aim of decreasing filler content, structure-complexed fillers were fabricated. This research presented an effective approach by noncovalent functionalization of poly(dopamine) (PDA) followed by silver nanoparticles decoration to fabricate 3-dimensional (3-D) structured boron nitride hybrids (BN@PDA@AgNPs). BN hybrids were then introduced into PA6 to prepare thermally conductive PA6 composites. The results demonstrated that PA6/BN hybrids (PMB) composites exhibited higher thermal conducivity compared with PA6/BN composites, which revealed more effective construction of thermal conductive network in the composites with the addition of 3-D structured fillers. The effects of BN hybrids with different loadings on thermal stability, mechanical property, as well as electrical resistance of the composites were also analyzed. Overall, the prepared PMB composites exhibited outstanding performance in thermal conductivity, thermal stability, mechanical property, while retaining good electrical insulating property, which showed a potential application in electronic packaging fields. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47630.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）