JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 6
·1-14
·
IF 2.6
Jiang Jiacheng,He Zhen,Yin Wang,Chen Rui,He Jing,Lang Meidong
As a typical biodegradable material, poly(lactic acid) (PLA) has great development potential in fields such as packaging, textiles and biomedical applications due to its high modulus and strength as well as excellent biocompatibility. However, the inherent brittleness and poor toughness of PLA significantly limit its widespread application. In this study, a biodegradable aliphatic–aromatic copolyester called poly(ethylene adipate- co -terephthalate) (PEAT) was synthesized using the industrially well-established direct esterification method. PEAT demonstrated excellent flexibility and extremely high fracture elongation. Its fracture elongation exceeded 900%, making it a highly ductile material with exceptional toughness. Given the complementary nature of PLA and PEAT, blending PLA with PEAT becomes a natural choice for improving the performance of PLA. The influence of the addition of PEAT on the mechanical properties, thermal performance, crystallization, phase morphology and rheological behavior of the blends was thoroughly investigated. With the addition of PEAT, the fracture mode changed from brittle fracture of the neat PLA to ductile fracture of the blends as illustrated by tensile test. The best toughening effect on PLA was achieved at a PEAT content of 30 wt%, with the elongation at break increasing from 6.7% for neat PLA to 359% for the binary blend, an improvement of 53 times. Additionally, the impact strength also increased from 4.4 kJ/m 2 to 10.5 kJ/m 2 , an increase of 138%. DSC revealed that PEAT had a certain influence on the crystallization behavior of PLA. SEM showed that the PEAT toughening mechanism was primarily attributed to a shear yielding mechanism triggered by debonding cavitation.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 18
·48634
·
IF 2.188
Guoqiang Wang,Yin Liang,Min Jiang,Qiang Zhang,Rui Wang,Honghua Wang,Guangyuan Zhou
The purpose of this study was to enhance the glass-transition temperature of poly(butylene 2,5-thiophenedicarboxylate) (PBTF). A series of poly(butylene- co -1,4-cyclohexanedimethylene 2,5-thiophenedicarboxylate)s (PBCTFs) were synthesized from 2,5-thiophenedicarboxylic acid, 1,4-cyclohexanedimethanol (CHDM), and 1,4-butanediol. CHDM can increase the chain rigidity and lead the β relaxation temperature shift to lower temperature. Consequently, PBCTFs showed not only the high glass-transition temperature, but also high elongations at break. PBTF was a crystalline polyester. However, differential scanning calorimetry and wide-angle X-ray diffraction results suggested PBCTFs were amorphous polyesters. Thermogravimetric analysis results indicated the thermal stability of copolyesters was gradually enhanced with increasing the CHDM content. When the CHDM content was 95 mol %, PBCTF95 exhibited high glass-transition temperature (69.2 °C), tensile strength (44.4 MPa), and elongation at break (205%). © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48634.
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
RSC Advances
·
2022
·Vol. 12
·期 42
·27633-27640
·
IF 4.036
Jianliang Jiang,Junxue Zhai,Lingxin Kong,Dongqi Zhao,Yakai Feng
The tensile strength and elongation at break of rubbers are mutually restrictive factors. Design and preparation of chloroprene rubber (CR) with high tensile strength, high elongation at break and excellent flame retardancy at the same time is challenging. Melamine cyanurate (MCA) is for the first time discovered to be a reactive flame retardant for CR. The tensile strength of C-M36 (with 3 wt% ZnO and 36 wt% MCA) vulcanizate is 2.5 times that of C-M0 (only with 3 wt% ZnO) vulcanizate, while the elongation at break of C-M36 vulcanizate is 1.3 times that of ZnO cross-linked C-M0 vulcanizate. At the same time, the limiting oxygen index of C-M36 (39%) is 1.22 times that of C-M0 (32%). FTIR and the vulcanization tests confirm that the reaction between CR and cyanuric acid occurs under the catalysis of a base (melamine), and the cyanuric acid molecules are grafted onto the molecular chain of CR. Two types of crosslinking networks are formed in CR vulcanizate, namely the traditional covalent bond crosslinks and the triple hydrogen crosslinks formed between cyanuric acid and melamine. Thus, the flame-retardant CR/MCA vulcanizate with high strength and high elongation at break is obtained. This research will strongly promote the industrial application of CR.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·Vol. 45
·期 16
·2400228
·
IF 4.2
Zeshang Jiang,Zhongtian Li,Jieting Geng,Lin Xia
To enhance the low-temperature toughness and resistance of the engineering plastic polyamide PA12, this study introduces novel PA12/MVQ@POE- g -MAH ternary composites using a two-step process and dynamic curing. Analytical results indicate that incorporating MVQ@POE- g -MAH into the PA12 matrix markedly enhances its toughness and heat resistance. As the MVQ@POE-g-MAH content increases, the elongation at break of PA12 composites significantly expands from 52.83% to 204.69%, and the notch impact strength escalates from 8.69 to 74.34 kJ m −2 . In addition, the brittleness temperature of PA12 decreases from −59.5 to −67.0 °C. Experimental findings confirm that POE- g -MAH is dispersed at the interface between MVQ and PA12, creating an encapsulated structure of MVQ@POE- g -MAH. This enhancement significantly broadens the potential applications of PA12 by improving its toughness, and resistance to both low and high temperatures, as well as impact endurance.
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
Journal of Biobased Materials and Bioenergy
·
2019
·Vol. 13
·期 1
·29-35
·
IF 0
Qin Chengrong,Wang Cheng,Liu Baojie,Huang Lingzhi,Liang Chen,Yao Shuangquan
The polymer-blend films (PBFs) have the potential to be utilized as packaging material for enhancing food shelf life. But the most important factor restricting the application is low mechanical strength. Recycling hemicellulose can be used as a new value-added product to increase economic
efficiency. In this paper, bagasse hemicellulose was extracted by pH pre-controlled hot water extraction. Its utilization in the reinforcement of a gelatin/carrageenan PBFs was studied. The effect of reaction parameters on the tensile strength (TS) and elongation at break (EAB) of PBFs was
studied. The most important reaction parameter was hemicellulose dosage. The optimum preparation process of PBFs was determined by the response surface analysis method. The optimum reaction conditions of TS was 34.84 °C, glycerin dosage 1.43%, hemicellulose dosage 0.92%, TS was 54.19 MPa.
The optimum reaction conditions of EAB was 34.92 °C, glycerin dosage 1.45%, hemicellulose dosage 0.87%, EAB was 26.42%. The results provide theoretical support for the application of hemicellulose in food packaging.
研究领域:
食品科学
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材料科学
✓ 已验证
DOI
Materials
·
2024
·Vol. 17
·期 13
·3368
·
IF 3.1
Chengwei Wu,Haocheng Yang,Xinpeng Cui,Yachun Chen,Zhonghua Xi,Jun Cai,Junsheng Zhang,Hongfeng Xie
Waterborne polyurethane asphalt emulsion (WPUA) is an environmentally friendly bituminous material, whose performance is highly dependent on the phase structure of the continuous phase. In this paper, WPUAs in the vicinity of phase inversion were prepared using waterborne polyurethane (WPU) and asphalt emulsion. The chemical structures, thermal stability, dynamic mechanical properties, phase-separated morphology and mechanical performance of WPUAs were studied. Fourier-transform infrared (FTIR) spectra revealed that there are no –NCO bonds in either the pure WPU or WPUAs. Moreover, the preparation of WPUA is a physical process. The addition of WPU weakens the thermal stability of asphalt emulsion. WPU improves the storage modulus of asphalt emulsion at lower and higher temperatures. The glass transition temperatures of the WPUA films are higher than that of the pure WPU film. When the WPU concentration increases from 30 wt% to 40 wt%, phase inversion occurs; that is, the continuous phase shifts from asphalt to WPU. The WPUA films have lower tensile strength and toughness than the pure WPU film. However, the elongations at break of the WPUA films are higher than that of the pure WPU film. Both the tensile strength and toughness of the WPUA films increase with the WPU concentration. Due to the occurrence of phase inversion, the elongation at break, tensile strength and toughness of the WPUA film containing 30 wt% WPU are increased by 29%, 250% and 369%, respectively, compared to the film with 40 wt% WPU.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 41
·期 11
·1786-1795
·
IF 4.3
Yu Tian-Xin,Liu Ya-Yuan,Tian Fu-Yue,Ning Nan-Ying,Yu Bing,Tian Ming
3D printing silicone elastomer has demonstrated great potential in diverse areas such as medical devices, flexible electronics and soft robotics. It is of great value to investigate how to improve the mechanical properties, including tensile strength and elongation at break of printed parts. In this work, a light curing system that can be applied in silicone elastomer 3D printing is explored, which is composed of vinyl terminated polysiloxane as the macromer and thiol containing polysiloxane as the crosslinking agent, and a chain extension reaction is also introduced into this light curing system via the addition of the chain extender dithiol molecules, and a light curing system accompanied with chain extension is designed and realized based on the thiol-ene click reaction mechanism. After reinforced with silica fillers, the obtained light curing system can endow the light curing silicone elastomer with better mechanical properties under the condition of a lower viscosity of the precursor, the tensile strength and elongation at break can reach 525.5 kPa and 601%, respectively. This light curing system provides a feasible method to solve the contradiction between the viscosity of the precursor and the mechanical properties of the light curing elastomer in the digital light processing (DLP) 3D printing field.
研究领域:
材料科学
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生物医学工程
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yuning Gong,Jinsong Cui,Ziqi Qin,Lu Wang,Yuhui Ao,Yu Liu,Lei Shang
The toughening of epoxy resin , crucial for advanced materials , typically requires balancing between enhancing specific properties and potential compromises elsewhere. This study presents a breakthrough in epoxy resin toughening using a novel approach: incorporating isophorone diisocyanate (IPDI) modified naringenin (IPNA) to create an in-situ interpenetrating network (IPN) with a one-pot method alongside DDM. This method fosters a cohesive IPN structure without phase separation, markedly boosting both strength and toughness. Specifically, with 15 wt% IPNA, tensile strength surged by 61.9%, and elongation at break by 240.2%. Additionally, IPNA's robust carbonization at high temperatures significantly enhances flame retardancy. Tests revealed a 62.9% reduction in peak heat release rate (PHRR) compared to unmodified epoxy, achieving an oxygen index (LOI) of 33% and a UL-94 V-1 rating. This research not only advances the toughening of epoxy resins but also opens new pathways for utilizing bio-based materials to simultaneously improve mechanical properties and flame resistance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Food Packaging and Shelf Life
·
2024
·
IF 8.5
Yi-Qi Liu,Ze-Kun Li,Hao-Ran Zhang,Zhi-Wei Wang,Chang-Ying Hu
Mechanically recycled plastics used in food packaging are consistent with the current circular economy concept. In this study, the effects of recycled polypropylene (rPP) content on film properties and the migration of processing aids in the film to food simulant and milk were studied by self-made rPP films. The results showed that the rPP and processing aids increased the transparency of the films. However, the presence of tiny particles in the rPP film reduced its elongation at break. Furthermore, rPP and processing aids decreased the thermal stability of the film. At 70 °C for 2 h, the total migration order of the processing aids to food simulant and milk was 50 % ethanol (55.78–64.17 mg/kg) > whole milk (10.32–10.66 mg/kg) > low-fat milk (6.39–7.04 mg/kg) > skim milk (4.88–5.47 mg/kg). The migration of processing aids into milk in films containing 50 % and 100 % rPP was similar to that of virgin polypropylene (vPP) films, which indicates that rPP does not promote processing aid migration. Moreover the overall migration order of processing aids to 2 % (w/v) food ingredient aqueous solution was lecithin (3.05 mg/kg) > glyceryl trilaurate (2.68 mg/kg) > cholesterol (1.33 mg/kg) > NaCl (0.33 mg/kg) > casein (0.32 mg/kg) > lactose (0.29 mg/kg) > water (0.16 mg/kg). This confirmed that milk fat was the primary cause of processing aids migration from the film, and the kind of milk fat also had an effect on processing aids migration. Therefore, as long as the basic performance and food safety of packaging are met, a certain proportion of rPP can be added to vPP to achieve sustainable development of packaging.
研究领域:
材料科学
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食品科学
·
聚合物工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2025
·
IF 2.5
Jiang Nan,Wang Yubo,Li Ju,Li Jie,Sheng Zunrong,Shang Kefeng,Lu Na,Wang Zhihong
Massive production and consumption of ground tire rubber (GTR) for transportation have led to significant waste rubber accumulation, posing a serious environmental threat. Rubber devulcanization technologies, as a promising strategy for rubber recycling, still face several challenges, including high consumption, pollution concerns. This study proposes an innovative method for rubber devulcanization using dielectric barrier discharge (DBD) plasma. Experimental results demonstrate a significant reduction in crosslink density, decreasing from 2.1 × 10 −4 mol/cm 3 to 0.8 × 10 −4 mol/cm 3 , after plasma treatment at a discharge voltage of 18 kV for 30 min. This reduction is accompanied by a decrease in gel content from 96.79 to 90.54%, indicating the effective cleavage of S-S and C-S bonds within GTR. Notably, after plasma treatment, the tensile strength and elongation at break of the regenerated rubber reached 10.2 MPa and 357.7%, respectively, meeting the standards for high-grade rubber. These mechanical properties meet the standards for high-grade rubber, rendering the devulcanized rubber suitable for reuse in industrial manufacturing processes. However, when the discharge voltage surpasses a critical level, the electron energy attains a magnitude sufficient to cause extensive structural damage to the rubber backbone of GTR. Consequently, this degradation results in a significant reduction in the molecular weight of the regenerated GTR, which ultimately leads to a decrease in both tensile strength and elongation at break. Based on a comprehensive analysis of experimental data and characterization results, a plausible mechanism for plasma-assisted devulcanization is proposed, highlighting the significant potential to enhance environmental sustainability and support circular economy initiatives.
研究领域:
环境工程
·
高分子科学
·
材料回收
·
等离子体技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 10
·期 5
·757-764
·
IF 6.331
Wanglong Zhang,Yiwei Zhang,Yu Dai,Fan Xia,Xiaojin Zhang
Strong hydrogel adhesion requires the synergy of adhesion and cohesion. Gradient adhesive–tough hydrogels can balance adhesion and cohesion, however, their construction is still a challenging task. Here, we used ethylenediaminetetraacetic acid (EDTA) on-side coordination-induced diffusion chelating Ca2+ to form an adhesive surface in a polyacrylamide/alginate–calcium (PAAm/Alg–Ca2+) tough hydrogel as a facile method for the construction of gradient adhesive–tough hydrogels. The adhesion energy of a gradient adhesive–tough hydrogel to skin is increased by 128% compared with PAAm/Alg–Ca2+ tough hydrogels and the elongation at break is two times higher than that of PAAm/Alg hydrogels. In addition, gradient adhesive–tough hydrogels also exhibit wide linear sensitivity (the gauge factor (GF) = 0.196 (0% < ε < 400%); GF = 0.260 (400% < ε < 650%)) as a wearable strain sensor to monitor human motions. This work provides a versatile strategy for the design of gradient adhesive–tough hydrogels and also provides a practical model for the development of wearable strain sensors.
研究领域:
材料科学
·
生物医学工程
·
可穿戴技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2022
·Vol. 29
·期 1
·100-108
·
IF 2.297
Kehui Han,Xinyan Shi,Yupeng Su,Yanlu Chen
Modifying nanoparticles for polymer nanocomposites is important for multifunctional and low-cost developmental direction. However, nanoparticles have several deficiencies, such as dispersion, agglomeration, and poor binding ability with most polymers. This work used soft polyvinyl chloride (PVC with 33.1% plasticizer volume) as the matrix. Polycaprolactone (PCL) was synthesized on the surface of SiO 2 by the bridging effect of silane coupling agent (SiO 2 -PCL), which was expected to improve the bond strength between SiO 2 and soft PVC matrix. Moreover, it enhanced the dispersion of SiO 2 in the PVC matrix. The results revealed that SiO 2 -PCL was nanodispersed in a soft PVC matrix and played a plasticizer role in the composite, which enhanced the tensile strength and elongation at break of PVC composites. The thermal stability and solvent extraction stability of PVC composites elevated with the increase of SiO 2 -PCL content. When the content of SiO 2 -PCL was 8 wt%, the tensile strength (14.54 MPa) and elongation at break (149.47%) of PVC composites were the highest, 64.36% and 60.48% higher than those of unfilled PVC, respectively. It was indicated that PVC composites were dramatically toughened and strengthened by modified SiO 2 , improving their overall performance.
研究领域:
材料科学
·
高分子科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）