Implications of styrenic triblock copolymer gel mechanics on midblock bridging fraction
Implications of styrenic triblock copolymer gel mechanics on midblock bridging fraction
复制标题
苯乙烯三嵌段共聚物凝胶力学对中间嵌段桥联分数的影响
DOI:
10.1016/j.polymer.2022.125394
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发表时间:
2022
期刊:
影响因子:
4.6
通讯作者:
Lee, Byeongdu
中科院分区:
文献类型:
--
作者:
Mineart, Kenneth P.;Vallely, Matthew J.;Rankin, Lucas A.;Hill, Duncan M.;Lee, Byeongdu
Triblock copolymer gels have garnered considerable scientific interest over the past few decades and are used in a variety of applications including consumer cushioning, pressure-sensitive adhesives, and ballistics gels. While many of their applications rely upon understanding mechanical properties, mechanical studies of block copolymer gels are relatively disjointed with each focusing on specific copolymers, which inherently have a fixed molecular weight and composition. The present study examines the quasistatic mechanical response of styrenic triblock copolymer gels composed of seven unique triblock copolymers at various concentrations. Resultant stress-extension data is fitted with the slip-tube network (STN) theory that describes gel mechanics based upon crosslinked network (Gc) and chain entanglement (Ge) modulus contributions. Collectively, modulus contributions imply that midblock bridging is independent of copolymer identity (i.e., molecular weight and block fraction) and dependent on triblock copolymer concentration viaFb∝φABA0.91±0.39over the concentration range examined (φABA= 0.05–0.39). Gels composed of a complementary diblock-triblock copolymer pair were subsequently analyzed to explore the influence of interlocking loop-loop and loop-bridge pairs within the effective midblock bridging population. These results point to the presence of a physically significant quantity of interlocked loops, but quantitative analysis was inconclusive.
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