MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 308
·期 4
·2200547
·
IF 4.402
Peng Fu,Jiahui Zhang,Yuancheng Zhang,Wei Zhao,Xiaomeng Zhang,Ge Shi,Yanjie He,Zhe Cui,Xinchang Pang,Minying Liu
Shape memory polyamide elastomers have attracted large attention owing to a variety of favorable properties (e.g., designable chemical structure, good thermal stability, flexibility, and elasticity, et al). However, the polyamide elastomer reported recently still lack good mechanical property. In the present work, a new type of shape memory thermoplastic polyamide elastomer (TPAE), composed of long carbon chain PA1212 and polytetramethylene ether glycol (PTMEG), is synthesized through two-step melt polycondensation, which is named as poly(ether- b -amide) (PEBA). The chemical structure of PEBA is confirmed by FTIR results and it also shows excellent mechanical properties. PEBA, possessing two melting temperatures, stay in microphase separation among PTMEG soft domains and PA1212 hard domains that are amorphous and α crystal, respectively. Furthermore, PEBA can fix a temporary shape after the heated strip is twisted and cooled down and then recover to the original shape after secondary heating, which is attributed to the fixing force provided by PTMEG domains and entropy elasticity of physically cross-linked PA1212 domains, respectively. Besides, PEBA elastomer can be reshaped between ≈190 and ≈380 °C and it also has shape memory behavior. This new kind of TPAE proposes a new smart material for sensors and soft robotics.
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
MACROMOLECULAR SYMPOSIA
·
2025
·Vol. 414
·期 4
·e70085
·
IF 0
Chenjun Zhang,Xi Zhang,Xiaodan Liu,Yiheng Li,Xiaoqi Wang,Xu Jin,Man Shen,Lanqiong Zhang
Specialty engineering rubber has been put forward with more stringent requirements. In this paper, the material properties and reinforcing effects of several fillers were investigated, and polyamide was selected as the target reinforcing material to modify hydrogenated nitrile butadiene rubber (HNBR) in order to improve the temperature resistance of the system. It was concluded that the mechanical properties of PA1212/HNBR system were better than those of PC/HNBR system at 120°C. The optimum PA1212 additive amount was determined through the mechanical property test and dispersion state observation of the blended system, which proved that the PA1212 reinforcing system significantly improved the heat resistance and mechanical properties of HNBR. The modified HNBR has excellent tensile strength and elasticity, which effectively improves the reliability and service life of the sealing equipment under high temperature conditions, and provides experimental references and theoretical basis for the research and development of high-temperature resistant rubber.
研究领域:
材料科学
·
高分子科学
·
机械工程
·
化学工程
✓ 已验证
产品关联
DOI
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Feifei Ji,Peng Fu,Shangyun Wang,Tong Liu,Lingling Lv,Xinyu Guan,Xiaomeng Zhang,Haitao Zhao,Xiaoguang Qiao,Xinchang Pang,Minying Liu,Qingxiang Zhao,Zhe Cui
Although polyamide- co -polyether, the most important co-polyamide species, has achieved big success, the inadequate biocompatibility still restricts it further application in biomedical area. In this paper, polydimethylsiloxane (PDMS) segment is introduced into copolymer to replace polyether segment, which is intended to fulfill the copolymer with improved surface performance. Two prepolymer condensation process was used to synthesis the novel PA1212- b -PDMS series, which is constructed by PDMS flexible segment (M n = 1000 g/mol) and PA1212 rigid segment (M n = 1000, 3000, 5000, 7000, 10,000 g/mol). FTIR and 1 H NMR were carried out to evidence the success of the copolymerization and verify the chemical structure . Melting and crystallization behavior , thermal stability, and crystal structure of the series were characterized by DSC , TG and XRD , respectively. To explore the potential usage of the copolymers, mechanical properties were thoroughly investigated. The series possess tunable toughness and rigidity corresponding to different chain compositions . When M n of PA1212 segment is above 5000 g/mol, the copolymer presents typical tough and stiff feature with an ultimate elongation rate of around 500% and a fair tensile strength around 35 MPa. More than that, the platelet adhesion and activation test was conducted to estimate the biocompatibility of the polymers. The contact angel goniometry and XPS were further utilized to understand their surface performance. The as-prepared copolymers give distinct-different performance from homo-polyamide and polyamide- co -polyether. Barely cell adhesion on the surface indicates the greatly improved biocompatibility achieved by the series, which promises the mechanical-property-adjustable novel co -polyamide a broad prospect in biomedical area.
研究领域:
材料科学
·
生物医学工程
✓ 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）