Polymers
·
2023
·Vol. 15
·期 5
·1183
·
IF 5
Yanpeng Wu,Tonghui Yang,Yongchang Cheng,Tao Huang,Bin Yu,Qilin Wu,Meifang Zhu,Hao Yu
Preparing flame-retardant polyamide 66 (PA66) fibers through melt spinning remains one of the biggest challenges nowadays. In this work, dipentaerythritol (Di−PE), an eco-friendly flame retardant, was blended into PA66 to prepare PA66/Di−PE composites and fibers. It was confirmed that Di−PE could significantly improve the flame-retardant properties of PA66 by blocking the terminal carboxyl groups, which was conducive to the formation of a continuous and compact char layer and the reduced production of combustible gas. The combustion results of the composites showed that the limiting oxygen index (LOI) increased from 23.5% to 29.4%, and underwriter laboratories 94 (UL-94) passed the V-0 grade. The peak of heat release rate (PHRR), total heat release (THR), and total smoke production (TSP) decreased by 47.3%, 47.8%, and 44.8%, respectively, for the PA66/6 wt% Di−PE composite compared to those recorded for pure PA66. More importantly, the PA66/Di−PE composites possessed excellent spinnability. The prepared fibers still had good mechanical properties (tensile strength: 5.7 ± 0.2 cN/dtex), while maintaining good flame-retardant properties (LOI: 28.6%). This study provides an outstanding industrial production strategy for fabricating flame-retardant PA66 plastics and fibers.Keywords:PA66;Di−PE;flame retardance;melt spinning;flame retardant mechanism
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Wentao Wang,Xiaolong Guo,Weiwei Geng,Kanghui Wang,Wenzheng Zhang,Lu Liu,Yuang Zhang,Bingtao Tang,Liming Ding
High performance continuous phase change fibers are of great significance to promote the development and application of functional fibers. But, it is still a challenge to fabricate continuous phase change fibers with high phase transition enthalpy. Herein, a kind of continuous polyurethane phase change fibers (PUPCFs) was first reported which was prepared through melt spinning from the synthesized polyurethane phase change materials (PUPCMs). PUPCFs not only overcomes the leakage problem of phase change materials, but also exhibits high latent heat (110.54 J/g), superior mechanical properties (maximum strain, ∼141.83 %), outstanding fatigue resistance, and good thermal cycle stability. Furthermore, a phase change thermoregulation textile (PUPCT/PDMS) with high enthalpy, hydrophobicity and breathability can be obtained by weaving PUPCFs and then coating with polydimethylsiloxane (PDMS). This work can provide a new idea for efficient and economical production of continuous phase change fibers and opens up opportunities for wearable thermal management textiles.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·125327
·
IF 1.449
Guyu Feng,Xinyue Wang,Diantang Zhang,Xueliang Xiao,Kun Qian
In recent years, there has been increasing interest on maintaining the efficiency of Polypropylene (PP) fibers by various methods during its application. In this paper, bilayer antioxidant microcapsules were successfully prepared with Irgafos168 as inner core, hindered polyphenol as inner shell, and TEMPO as outer shell via in situ polymerization method combined with water phase separation method. Structure and property of microcapsules were investigated by FT-IR, XPS, SEM, and TGA analysis. Results showed that microcapsules were successfully prepared with bilayer structure. Microcapsules had spherical shape with particle sizes of 1.09 ± 0.35 μm. They also had good thermal stability to ensure stable structure and property during melt-spinning process. These microcapsules were then blended with PP melts to fabricate composite PP fibers via melt-spinning technique. DSC measurement and accelerated aging treatment was performed to investigate the effect of microcapsules on aging resistance of composite PP fibers. Results showed that the addition of bilayer microcapsules significantly increased the onset oxidation temperature and decreased the aging rate of PP fibers, indicating that the addition of bilayer microcapsule effectively improved the aging resistance of PP fibers. Furthermore, the addition of microcapsules contributed to maintain sound surface morphology of PP fibers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Yingying Li,Yali Liu,Ai Liu,Changjie Xu,Chijian Zhang,Jianyong Yu,Ruchao Yuan,Faxue Li
Introducing the renewable poly(trimethylene ether glycol) (PO3G) as soft segments into bio-based poly(propylene terephthalate) (PTT), which is synthesized from the bio-based propylene glycol (PDO) monomer, results in thermoplastic polyester elastomers (PTT-PO3G) with superior thermomechanical properties. As the PO3G content in PTT-PO3G copolymers increased from 20 wt% to 60 wt%, the melting temperatures of these copolymers decreased from 220 to 174°C, and the tensile strength decreased from 31.7 to 4.2 MPa with the Shore hardness falling from 60 to 26 D, whereas the elongation at break showed an increase tendency from 697 % to 1074 %. Characterizations utilizing dynamic thermomechanical analysis (DMA), small angle X-ray scattering (SAXS), and atomic force microscopy (AFM) revealed the presence of microphase separations in PTT-PO3G copolymers. The strength and moisture regain of PTT-PO3G-20 elastic fibers fabricated via an eco-friendly melt spinning technique reach 1.42 cN/dtex and 1.52 %, which are 58 % and 407 % higher than those of traditional wet-spun Spandex® fibers, respectively. Surprisedly, the resilience of PTT-PO3G-20 fibers exceeded 96 % at an elongation of 20 %, demonstrating its promising potential as a sustainable alternative to Spandex® fibers in textile applications. The excellent thermodynamic properties indicate that the bio-based PTT-PO3G copolymers have great potential to replace traditional petroleum-based elastomers for promoting the sustainable and low-carbon global development.
研究领域:
材料科学
·
纺织工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Jianan Shan,Gaoming Mo,Qing Sun,Jing Huang,Qin Ouyang,Qing Huang
SiC fiber is an important structural material in high-temperature extreme environments and nuclear energy applications. Oxidation and electron irradiation are main curing methods for the fabrication of industrial SiC fibers. In this work, a photo-sensitive polyvinylaluminocarbosilane (PVACS) is facilely prepared by blending polyaluminocarbosilane (PACS) and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4Vi), which can be melt spun, cured by ultraviolet irradiation at room temperature. After thermal pyrolysis and sintering, the SiC(OAl) fibers with oxygen content of 8.84 wt% and C/Si ratio of 1.34, the SiC(Al) fibers with oxygen content of 0.29 wt% and C/Si ratio of 1.03 are achieved. The cured mechanism and the structural evolution from the precursor fiber to the final ceramic fibers is investigated. The results show that homopolymerization of D4Vi is the main curing mechanism in addition to the β-addition of hydrosilylation. Different from the typical oxidative curing, the oxygen in the fibers mainly comes from D4Vi. At about 800 ℃, the SiAl x O y phase, the SiC x O y phase and free carbon are formed. At 1200 ℃, the Al-C bonds possibly in Al 4 C 3 are formed. At around 1600 ℃, Al may exist mainly in the form of Al 4 O 4 C, and the amorphous carbon phase changes into crystalline graphitic structure. Meanwhile, a lot of mesopores and macropores in the SiC(OAl) fibers are formed due to thermal decomposition of the SiC x O y phase. However, at 1800 ℃, the SiC(Al) fibers densify again due to the formation of Al 2 OC and Al 4 SiC 4 phases, which also inhibit the growth of β-SiC and favor the formation of α-SiC.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 15
·期 1
·186
·
IF 4.967
Qun Yang,Run Zhang,Mingfei Liu,Ping Xue,Lichao Liu
Ultra-high molecular weight polyethylene (UHMWPE)/high-density polyethylene (HDPE) blend with lower viscosity is more suitable for melt spinning compared to pure UHMWPE; however, the mechanical property of the blend fiber is hard to dramatically improve (the maximum tensile strength of 998.27 MPa). Herein, different content modified-nano-SiO2is incorporated to UHMWPE/HDPE blend fiber. After adding 0.5 wt% nano-SiO2, the tensile strength and initial modulus of UHMWPE/HDPE/nano-SiO2fiber are increased to 1211 MPa and 12.81 GPa, respectively, 21.57% and 43.32% higher than that of UHMWPE/HDPE fiber. Meanwhile, the influence of the nano-SiO2content on the performance for as-spun filament and fiber are emphatically analyzed. The crystallinity and molecular chain orientation of as-spun filament reduces with the addition of nano-SiO2. On the contrary, for fiber, the addition of nano-SiO2promoted the crystallinity, molecular chain orientation and grain refinement more obvious at a lower content. Furthermore, the possible action mechanism of nano-SiO2in the as-spun filament extrusion and fiber hot drawing stage is explained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Peng Wei,Jiaojiao Li,Jinfei Yan,Junhui Li,Jichao Zhang,Yuchen Liu,Wanwan Li,Yumin Xia,Yanping Wang
In order to acquire polymeric fibers have both excellent flame retardance and mechanical properties, high molecular weight phosphorus-containing liquid crystal copolyesters derived from 6-hydroxy-2-naphthenic acid (HNA), terephthalic acid (TA) and 10-(2,5-dihydroxypheny)-10-hydro-9-oxa-10-phospha phenanthrene-10-oxide (DOPO-HQ) were synthesized via “one-pot” melt polymerization, and then the fibers were obtained by melt spinning method. The structure and property of the copolyesters were studied elaborately by experimental characterization technique and molecular simulation method. Shear shinning behavior was observed from rheology measurement, indicating that the copolyesters had excellent melt fluidity and spinnability. The rigidity of molecular chain was efficiently improved by the phosphorus-containing monomer DOPO-HQ and naphthalene HNA units which could be reflected by the molecular simulation results as well as high T g values. The flame retardant mechanism of the phosphorus-containing flame retardant copolyester was systematically studied via limiting oxygen index (LOI), vertical burning (UL-94) test, cone calorimetry, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that the copolyesters exhibit synergistic flame retardant mechanism of gas phase and condensed phase. Meanwhile, mechanical property of the as-spun fibers could be significantly improved by increasing the spinneret draw ratio (SDR) attributed to high molecular chain orientation. The maximum tensile strength of the as-spun fiber was 0.77 GPa observed for P-HNA60P20 at a relatively low SDR of 29. It was shown the unique combination of good thermal stability, spinnability as well as mechanical and flame retardant properties of the copolyesters would make them could be used as high-performance flame retardant materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 10
·1599
·
IF 3.164
Xiaoming Qi,Wentong Yang,Laiming Yu,Wenjun Wang,Haohao Lu,Yanglong Wu,Shanwen Zhu,Yaofeng Zhu,Xiangdong Liu,Yubing Dong,Yaqin Fu
One-dimensional shape memory polymer fibers (SMPFs) have obvious advantages in mechanical properties, dispersion properties, and weavability. In this work, a method for fabricating semi-crystallization ethylene-vinyl acetate copolymer (EVA) fiber with two-way shape memory effect by melt spinning and ultraviolet (UV) curing was developed. Here, the effect of crosslink density on its performance was systematically analyzed by gel fraction measurement, tensile tests, DSC, and TMA analysis. The results showed that the crosslink density and shape memory properties of EVA fiber could be facilely adjusted by controlling UV curing time. The resulting EVA fiber with cylindrical structure had a diameter of 261.86 ± 13.07 μm, and its mechanical strength and elongation at break were 64.46 MPa and 114.33%, respectively. The critical impact of the crosslink density and applied constant stress on the two-way shape memory effect were analyzed. Moreover, the single EVA fiber could lift more than 143 times its own weight and achieve 9% reversible actuation strain. The reversible actuation capability was significantly enhanced by a simple winding design of the single EVA fiber, which provided great potential applications in smart textiles, flexible actuators, and artificial muscles.Keywords:shape memory polymer fiber;two-way shape memory effect;melt spinning;UV curing
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Zhihao Zhang,Zhiyuan Yao,Yujing He,Senlong Yu,Meijia Chen,Zhenjiang Shi,Jiaxu He,Hengxue Xiang,Meifang Zhu
In this work, a series of 1,4-cyclohexanedimethanol (CHDM)-based copolyester fibers are prepared by chemical structure design and crystal structure regulation. The chemical structures of poly(ethylene terephthalate-co-1,4-cyclohexanedimethylene terephthalate, (PETG)) copolyesters are first confirmed by 1 H- and 13 C-nuclear magnetic resonance which indicates that all copolyesters are random copolyesters. Then, the crystallization and melting behavior, thermal stability, and mechanical properties of copolyesters are significantly affected by the CHDM content and CHDM cis-trans isomerism ratio, showing that trans-CHDM can effectively improve the comprehensive performance of PETG copolyesters. Besides, the influence of the CHDM monomer (amount and cis-trans isomerism ratio) and melt-spinning drawing process on the crystal structure and mechanical properties (tensile strength, elongation) is also investigated by wide-angle X-ray diffraction, small-angle X-ray scattering, and tensile testing. Especially, the resultant PETG30-trans80 copolyester fibers exhibit good mechanical properties, and the tensile strength and elongation are 113.9 MPa and 136.5%, respectively. Therefore, our work provides a promising strategy for the fabrication of copolyester fiber. Highlights Bio-based PETG copolyester was obtained. Synergistic effects of a chemical structure and drawing process of PETG fiber were discussed. The influence of drawing process on crystallization, and orientation of fiber properties was studied.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Quzhi Song,Xin Long,Bing Wang,Qianlong Wang,Huabin Li,Ming Zou,Shuai Gao,Xianghua Hu,Shuo Xiong,Yingde Wang
The increasing operational temperatures of aircraft antenna windows caused by aerodynamic heating in high-speed flight systems necessitate microwave window materials with exceptional thermal stability. In this study, functionalized boron nitride nanosheets (F-BNNS) modified SiNO (F-BNNS/SiNO) fibers are obtained through melt spinning, air-curing, decarburization, and sintering process. The F-BNNS/SiNO fibers exhibit superior high-temperature stability, retaining 60% of initial tensile strength at 1600 °C, outperforming pristine SiNO fibers (19% at 1400 °C) and electron beam irradiation crosslinked Si 3 N 4 fibers (43% at 1450 °C). The composition and structure evolution of F-BNNS/SiNO fibers at 1400~1700 ℃ were investigated, and in combination with molecular dynamics simulations, it was revealed F-BNNS effectively mitigating the structural degradation at high-temperatures through interfacial bonding. Furthermore, F-BNNS enhances microwave transparency of SiNO fibers by reducing dielectric constant and loss. This work establishes a pathway for developing high-performance ceramic fibers with integrated thermomechanical stability and electromagnetic functionality, advancing aerospace material design.
研究领域:
材料科学
·
陶瓷纤维
·
航空航天材料
·
高分子复合材料
·
电磁功能材料
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Tan Hui,Zhang Luzhi,Ma Xiaopeng,Sun Lijie,Yu Dingle,You Zhengwei
Fibers, with over 100 million tons produced each year, have been widely used in various areas. Recent efforts have focused on improving mechanical properties and chemical resistance of fibers via covalent cross-linking. However, the covalently cross-linked polymers are usually insoluble and infusible, and thus fiber fabrication is difficult. Those reported require complex multiple-step preparation processes. Herein, we present a facile and effective strategy to prepare adaptable covalently cross-linked fibers by direct melt spinning of covalent adaptable networks (CANs). At processing temperature, dynamic covalent bonds are reversibly dissociated/associated and the CANs are temporarily disconnected to enable melt spinning; at the service temperature, the dynamic covalent bonds are frozen, and the CANs exhibit favorable structural stability. We demonstrate the efficiency of this strategy via dynamic oxime-urethane based CANs, and successfully prepare adaptable covalently cross-linked fibers with robust mechanical properties (maximum elongation of 2639%, tensile strength of 87.68 MPa, almost complete recovery from an elongation of 800%) and solvent resistance. Application of this technology is demonstrated by an organic solvent resistant and stretchable conductive fiber.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2020
·
IF 2.908
Peng Wei,Hejuan Lou,Wei Wang,Shaonan Geng,Yanping Wang,Yumin Xia,Yimin Wang,Mingli Jiao
In this study, wholly aromatic phosphorus-containing thermotropic liquid crystal polymers (TLCP) derived from 6-hydroxy-2-naphthenic acid (HNA), terephthalic acid (TA) and 10-(2,5-Dihydroxypheny)-10 h-9-oxa-10-phospha-phenanthrene-10-oxide (DOPO-HQ) are successfully synthesised via one pot melt polymerisation method. Although, the resulted copolyesters are amorphous, high glass transition temperature (182–196 °C) is observed due to the existence of kinked DOPO-HQ unit and crankshaft HNA monomer. The nematic liquid crystal behaviour is found for all of the copolyesters under POM at relatively low temperature (190–207 °C). The copolyesters show good thermal stability and high char yield under both nitrogen and air atmosphere, which of the initial degradation temperature (T5%) and char yield are above 450 °C and 50%, 439 °C and 29%, respectively. Dynamic rheology results show that viscous modulus of the obtained copolyesters are much more prominent under both frequency and temperature sweeping mode, indicating have excellent processing ability. The fibres can be easily drawn from the melt, and exhibit well oriented fibrillated structure. The convenient polymerisation method, excellent thermal stability and fibre formation ability of the phosphorus-containing TLCP endow them much potential use in the safety protection field.
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）