共单体
共聚物
小角X射线散射
高分子化学
链式转移
材料科学
丙烯酸酯
聚合
极限抗拉强度
聚合物
自由基聚合
复合材料
散射
光学
物理
作者
Feng Jiang,Chu Fang,Juan Zhang,Wentao Wang,Zhigang Wang
出处
期刊:Macromolecules
[American Chemical Society]
日期:2017-08-11
卷期号:50 (16): 6218-6226
被引量:47
标识
DOI:10.1021/acs.macromol.7b01414
摘要
ABA triblock copolymer elastomers (TBCPEs) were first synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization, for which poly(isobornyl acrylate) (PIBA) was chosen as the dispersed hard microdomains, whereas poly(n-butyl acrylate)-co-poly(1-vinylimidazole) (P(BA-co-VI)) was chosen as the rubbery matrix. Two much distinct glass transition temperatures were found, corresponding to the soft matrix and hard microdomains, respectively. Although the mass percentages of the incorporated third comonomer, 1-vinylimidazole, were just about 2.0%, the imidazole groups on the TBCPE chains could be ionically cross-linked by 1,6-dibromohexane to bring these TBCPEs into much strong ones, half-cross-linked TBCPEs-HC and full-cross-linked TBCPEs-FC. It is interesting to demonstrate that the ultimate tensile strength for TBCPEs-FC could be increased up to 10 times that for TBCPEs, and the elastic recovery could also be improved to above 90%, while the elongation at break just showed modest decreases. Transmission electron microscope (TEM) and small-angle X-ray scattering (SAXS) measurements disclosed that TBCPEs, TBCPEs-HC, and TBCPEs-FC all had typical microphase-separated morphology, with the interdomain distance tunable by the molecular mass of TBCPEs. In-situ SAXS measurements revealed that the hard microdomains in TBCPEs-HC could be orientated along the tensile direction during stretching and be recovered to the original state after stress release.
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