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
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
复制标题
基于应变-温度空间微观结构演化重建聚丁二烯橡胶的力学响应：熵弹性和应变诱导结晶作为桥梁
DOI：
10.1039/c9sm02029b
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发表时间：
2020-01-14
期刊：
影响因子：
3.4
通讯作者：
Li, Liangbin
中科院分区：
文献类型：
--
作者：
Chen, Pinzhang;Lin, Yuanfei;Li, Liangbin
采用同步辐射广角X射线衍射（SR-WAXD）技术，在宽温度范围（-90 ℃ ~> 25 ℃）内研究了聚丁二烯橡胶（BR）的应变诱导结晶（SIC）。根据SIC的存在或不存在和静态结晶温度，三个温度区域被划分。详细的结构演变总结在应变-温度空间。基于此微观结构的演变信息，BR，聚（异丁烯-异戊二烯）橡胶（IIR）和天然橡胶（NR）的宏观力学响应，再现基于Flory和Plagge的理论。讨论了计算应力-应变曲线与实验应力-应变曲线不匹配的原因，特别是在大应变区，认为主要是宏观-微观连接方法和网络的不均匀性造成的。
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 degrees C -> 25 degrees 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.