JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Chaoyi Guo,Jie Jiang,Zhihua Zhu,Jinjin Li,Ling Zhao,Zhenhao Xi
Semi-aromatic nylon MXD6 shows superior mechanical strength and gas barrier properties. To improve its toughness and get sight into its excellent properties, a series of poly( m -xylylene adipamide-co-isophthalamide) (MXD6/I) random copolyamides were synthesized using adipic acid, isophthalic acid (IPA) and m -xylylene diamine as monomers via direct melt polycondensation. The effect of IPA content on the thermal, crystallization, heat resistant, mechanical, and barrier properties of the copolyamides were systematically investigated. The results showed that the increase of IPA content from 0 to 12 mol% resulted in a decrease in the melting point of the copolyamides from 238 to 217°C but the glass transition temperature ( T g ) increased from 88 to 105°C. Correspondingly, the Vicat softening temperature decreased from 199.2 to 172.5°C. The crystallization rate of the copolyamides significantly decreased with the increase of the IPA content. The copolyamides had improved elongation and rupture energy and decent oxygen barrier properties with the introduction of IPA. It is expected that this study would guide design of MXD6 macromolecular chain structure to prepare high-performance MXD6 materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Chonghui Li,Liyun Yu,Weizhen Zhao,Frederikke Bahrt Madsen,Anne Ladegaard Skov
Photoreversible, color-changing films have great potential in various optical applications. In this study, we developed a photochromic film by embedding droplets of metatitanic acid (hydrous TiO 2 ) and glycerol in commercially available poly(dimethylsiloxane) (PDMS) silicone elastomers. Benefiting from the electron–hole pair scavenging abilities of glycerol, the resulting film exhibited rapid photoresponse, high photoreversible stability, excellent antiaging capability, and remarkable stretchability. The degree of color changes upon ultraviolet (UV) irradiation was effectively controlled by adjusting both the concentration of hydrous TiO 2 (1–20 wt%) and UV irradiation time (5–30 min), thereby increasing total color-changing ability (Δ E ). High-resolution patterns could be repetitively printed, erased, and rewritten (≥20 times) with no significant loss of clarity. After a 30-day exposure to ambient air, there were no significant aging effects in the photochromic ability of the films, thus demonstrating promising potential as rewritable films for information storage.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 16
·e55264
·
IF 2.7
Yizhe Liu,Yang Wu,Kai Feng,Hui Liu,Chenxi Qin,Meirong Cai,Xiaowei Pei,Feng Zhou
In this work, a hydrophobic guest monomer containing adamant end-group was synthesized and introduced into the acrylamide hydrogel system to prepare macroscopic guest hydrogel. The swelling, transparency, and mechanical properties of the guest hydrogels can be significantly changed by soaking the guest hydrogel into hydrophilic cyclodextrin solution because the hydrophobic guest groups were recognized and covered by the hydrophilic host molecules. In addition, the surface lubrication property could be adjusted by changing the proportion of acrylamide and adamantane monomers in the hydrogel system. More importantly, cyclodextrin can bind with adamantane through host-guest interactions, enabling the adjustment of the hydrophilicity/hydrophobicity properties of the hydrogel system. By controlling the assembly time, the hydrogel with different lubrication behaviors can be obtained. The controllable surface friction that this specific binding of host-guest interaction has broad application prospects in intelligent device, bionic lubrication and other fields.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Yuxiu Yu,Jin Li,Yaodong Liu
This study investigated the fabrication of polyacrylonitrile (PAN) membranes using non-solvent induced phase separation methods, with the addition of thermoplastic polyurethane (TPU) as an additive. The incorporation of TPU and the utilization of stepwise induced phase separation techniques resulted in notable improvements in membrane structure and water filtration performance. Scanning electron microscopy revealed that membranes with TPU exhibited a denser pore network and finer primary channels, leading to enhanced water flux and protein rejection rates. Mechanical testing indicated that TPU addition improved the membrane's mechanical properties, particularly its elongation at break and tensile strength, especially under wet conditions. Additionally, optimization of the coagulation bath involved methanol spraying followed by water immersion, resulting in membranes with further enhanced flux and rejection properties. Compared with neat PAN membranes, the membranes with TPU exhibited increased water flux from 405 to 539 L/m 2 h, as well as improved elongation at break and tensile strength in both dry and wet conditions. Furthermore, the combination of stepwise induced phase separation significantly enhanced the water flux from 342.7 to 483.0 L/m 2 h, while also improving the retention rate of ovalbumin from 25.7% to 31.5%.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Dong Zhao,Ziyao Hu,Xin Wang,Xuezhong Gong,Yao Wang,Olga Grigoryeva,Mykhailo Danilov,Alexander Fainleib,Peter Strizhak,Jianguo Tang
Thermally stable polymeric coatings are widely used for metal protection at high temperatures, but their brittle weakness makes them unavailable to durable environment. To overcome that, we report properties of cyanate ester resin (CER) coating doped with unzipped carbon nanotubes (uCNTs) loaded with terbium complex (TBP) as nanofiller. The performance of the coating showed that the bending flexibility, adhesion, and impact resistance of the doped coatings was significantly improved. The cylinder bending test showed that the minimal bending diameter of CER doped with TBP-uCNTs coating reached 6 mm without failure, which represents a significant improvement compared to the pure CER coating (18 mm). Surprisingly, the impact resistance reached the highest value of 50 cm without any failure of the coating. X-ray diffraction, Fourier transform infrared spectroscopy, Raman, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy studies of CNTs, uCNTS, TBP-uCNTs, and properties of CER indicate that formation of CER/TBP-uCNTs composite is supported by a chemical reaction between hydroxyl groups of TBP-uCNTs and the cyanate groups of CER resulting in fabrication of a solid cross-linked structure. The thermal decomposition temperature of the coating increases from 409°C for pure CER to 453°C for CER/TBP-uCNTs. The fluorescence spectra show that CER/TBP-uCNTs exhibits strong luminescence at 550 nm.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Teng Ma,Yaxin An,Jiaxin Zhang,Zengliang Wen,Dandan Lian,Jianjun Lu,Hua Wang
In this study, a hybrid microsphere structure with a polyhexamethyleneguanidine hydrochloride (PHMG) core and a nano-zinc oxide (Nano-ZnO) antibacterial additive shell was designed through the reaction extrusion in polypropylene (PP). The realization of this structure enabled the successful resolution of the agglomeration problem of Nano-ZnO and achieved a synergistic antibacterial effect between Nano-ZnO and PHMG. Special attention was paid to the interaction between Nano-ZnO and PHMG through the organic–inorganic hybridization. In addition, the nonwoven materials with different Nano-ZnO and PHMG contents were prepared via a melt-blown technique in PP, and their antibacterial properties were evaluated as well. Based on the findings, the synergistic antimicrobial mechanism of Nano-ZnO/PHMG structures was established. The results showed that the addition of 2% Nano-ZnO and 1% PHMG in PP (PP/2%ZnO/1%PHMG) allowed for the production of a melt-blown nonwoven material with an antibacterial efficiency of 99.99% against Staphylococcus aureus and Escherichia coli . Besides that, the material exhibited the outstanding performance and durability (the breaking strength of 2.43 N, the air permeability of 537 mm/s, the filtration efficiency of 97.25%, and the filtration resistance of 28.38 Pa).
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 37
·e55948
·
IF 2.7
Hao-Kai Peng,Xiao-Feng Wu,Hong-Yan Zhao,Xiao-Meng Wang,Ting-Ting Li,Ching-Wen Lou,Jia-Horng Lin
The crucial point of solar thermal utilization makes solar heat collector gathering much attention. In this study, imitating polar bears' fur structure, fluorescent materials are modified into a solar heat collector, and the photothermal conversion is evaluated to examine the influence of polyvinyl alcohol concentration, fluorescent luminescence type and fluorescence concentration. The test results indicate that fluorescent materials that has a greater Stokes shift show the greater photothermal effect. Moreover, when composed of a PVA concentration being 5.0% and a fluorescent concentration being 0.50%, the composites exhibit the maximal photothermal conversion temperature (99.4°C) that is 17.9% higher than that of the solar heat collectors without fluorescent materials. This study proposes creating solar heat collector with modified fluorescent materials, and the new perspective of which demonstrates that the composites have a great potential and application prospect in the solar photothermal field.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Jinbiao Zhao,Huimin Duan,Hao Yang,Zhichao Huang,Dongming Qi
In order to reduce the high pollution and flammability of polyurethane in high-performance automotive synthetic leather, the development of a solvent-free flame-retardant reactive polyurethane (RPU) coating material has become a research focus. However, solvent-free environments not only place higher requirements on the fluidity and processability of materials but also present significant technical challenges in achieving a balance between strength and flame retardancy. In this paper, inorganic ionic polymer particle ammonium polyphosphate (APP) was used as filler and reactive polyurethane resin as a carrier to prepare a flame-retardant modified polyurethane composite membrane with a foaming structure through a two-step method. The results showed that adding 4% APP could extend the molding time of reactive polyurethane to 550 s—an increase by about 53%—and increase its mechanical strength to 23.01 MPa. Thermal analysis verified that the cross-linking degree of reactive polyurethane resin was increased due to APP, and its thermal stability could be effectively improved. The reactive polyurethane modified with 4% APP had a residual carbon content exceeding 12% after heat treatment, and its limiting oxygen index can reach 23.7%. Additionally, the peak value of heat release rate (PHRR) was reduced by 10.7% and total heat release rate (THR) by 25.1%, enhancing the flame retardant effect. This method was of great significance to the production of polyurethane for automotive leather.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 26
·e55563
·
IF 2.7
Yajun Wang,Yiyan Gao,Guanghui Gao
Ionic conductive hydrogels have caught much attention for serving as wearable sensors, however, most hydrogel sensors are difficult to be used for repeated sensing due to low toughness and poor self-recovery. Here, tough and self-recovery hydrogels are constructed by introducing xanthan gum into poly(acrylamide-co-trimethyl ammonium chloride) (P(Am-DMC)) hydrogel network. Xanthan gum can bind with P(Am-DMC) chains via hydrogen bonds and the carboxyl group from xanthan gum generates electrostatic interaction with DMC, thus improving the mechanical toughness and fatigue resistance. Furthermore, the hydrogel is highly sensitive to mechanical deformation and presents durability for repeated stretching or compression, which can be designed as a wearable sensor for human motion detection. It is anticipated that the successful design of xanthan gum-toughened hydrogel can broaden the application range of hydrogels.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Bo Mu,Yun'an Li,Kang Du,Xiaoqin Dai,Li Tian,Junhong Guo,Baoping Yang,Jinfeng Cui,Xuemei Bao
Dimensionally stable and high strength Polyimide(PI)/nKevlar composite aerogels are fabricated by the inclusion of nano Kevlar fibers with PI precursor polyamide acid via solution mixing and subsequent vacuum drying. The rigid macromolecular structure of nKevlars and the intermolecular hydrogen bonding result in lower shrinkage/density and larger porosity. The PI/nKevlar composite aerogels demonstrate a 23.4% reduction in the linear shrinkage. Compared with pure polyimide aerogel, the friction coefficient and wear rate of composite aerogel decreased significantly, with the dry friction wear rate of the PI/nKevlar-1.0 reduced by 34.14% and the friction coefficient of the oil-containing aerogel reduced by 28.29% ascribing to the increased loading bearing of the composite.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 14
·e55192
·
IF 2.7
Jing-Fang Zhang,Ren-Cheng Tang
Kapok fiber (KF) with a naturally hollow structure has found an increasing application in filling and composite materials, most of which have a demand of flame retardancy. To realize this high-value utilization, KF was phosphorylated by a reactive phosphorus- and nitrogen-containing flame retardant for enhanced fire safety. The flame retardant was first synthesized by the reaction of urea and diethylene triamine pentakis (methyl phosphonic acid) (a commercially available scale inhibitor) with low cost, and then, applied in the phosphorylation of KF in the presence of dicyandiamide. In thermogravimetric analysis, phosphorylated KF showed 38.1% residue weight in nitrogen and 10.2% residue weight in air at 700°C, whereas the residue weight of KF was 8.4% in nitrogen and 1.5% in air. In microcalorimetric analysis, the heat release capacity and total heat release of phosphorylated KF displayed a reduction of 81% and 55%, respectively. In vertical combustion test, phosphorylated KF was difficult to ignite and had no afterburning or smoldering. The tests indicated that phosphorylated KF had excellent charring properties, low heat release, and good flame retardancy. This work suggests a promising strategy of enhancing the flame retardancy of KF and increasing its applicability in filling and composite materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Linda Yahia Cherif,Nacira Naar,Ahmed Mekki,Amina Ouadah,Rania Ahmed Hamada,Djalal Trache
Polylactic acid (PLA) is a biosourced thermoplastic polymer widely used in various fields such as biomedical, packaging, and prototyping. Enhancing PLA thermal and mechanical properties has been a research focus, by transforming it into a vitrimer, a new polymer class. This study demonstrated the effectiveness of a dual reactive extrusion process followed by vacuum compression molding to improve a thermoplastic's properties with vitrimer tendency, using PLA as the main component, diglycidyl ether bisphenol A (DGEBA) as an additive, and zinc acetate as a catalyst. Several characterizations were carried out to assess the thermal, morphological, and mechanical properties of the developed PLA mixtures. Moreover, a kinetic study using three iterative isoconversional integral models (iterative Kissinger–Akahira–Sunose (it-KAS), iterative Flynn–Wall–Ozawa (it-FWO), and Trache–Abdelaziz–Siwani) was employed to analyze the effects of the catalyst and DGEBA on the cross-linking reaction kinetics after the process employed in this work. Results demonstrated the presence of a cross-linked structure in addition to a promising polymer behavior characterized by enhancements in toughness, ductility, and cross-linking density by 290%, 127.5%, and 80.5%, respectively. Finally, the optimal composition exhibited almost 96% self-healing of its surface, demonstrating significant potential for advanced material applications.
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高影响因子
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