Reconstructing the mechanical response of polybutadiene rubber based on micro-structural evolution in strain-temperature space: entropic elasticity and strain-induced crystallization as the bridges.,Soft Matter

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Reconstructing the mechanical response of polybutadiene rubber based on micro-structural evolution in strain-temperature space: entropic elasticity and strain-induced crystallization as the bridges.
Soft Matter ( IF 2.9 ) Pub Date : 2019-11-26 , DOI: 10.1039/c9sm02029b
Pinzhang Chen ₁ , Yuanfei Lin , Jingyun Zhao , Lingpu Meng , Daoliang Wang , Wei Chen , Liangbin Li

Affiliation

Strain-induced crystallization (SIC) in polybutadiene rubber (BR) was studied by in situ synchrotron radiation wide-angle X-ray diffraction (SR-WAXD) over a broad temperature range (−90 °C → 25 °C). Depending on the presence or absence of SIC and quiescent crystallization temperature, three temperature regions are divided. Detailed structural evolution is summarized in the strain-temperature space. Based on this micro-structural evolution information, the macroscopic mechanical response of BR, together with poly(isobutylene-isoprene) rubber (IIR) and natural rubber (NR), is reproduced based on Flory's and Plagge's theories. The origins of the mismatch of calculated and experimental stress–strain curves, especially in the large strain region, are discussed, and are mainly ascribed to the micro-macro connection approach and the network inhomogeneity.

中文翻译：

基于应变温度空间内的微观结构演化，重建聚丁二烯橡胶的机械响应：以熵弹性和应变诱导结晶为桥梁。

通过原位研究了聚丁二烯橡胶（BR）中的应变诱导结晶（SIC）在较宽的温度范围（-90°C→25°C）下进行同步辐射广角X射线衍射（SR-WAXD）。根据是否存在SIC和静态结晶温度，可分为三个温度区域。在应变温度空间中总结了详细的结构演变。基于这种微观结构的演化信息，基于弗洛里（Flory）和普拉格（Plagge）的理论复制了BR以及聚异丁烯-异戊二烯橡胶（IIR）和天然橡胶（NR）的宏观力学响应。讨论了计算应力曲线和实验应力应变曲线不匹配的根源，特别是在大应变区域，并且主要归因于微宏连接方法和网络不均匀性。

更新日期：2019-11-26

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