Craze Extension Ratio of Semiflexible Polymer Glasses
Craze Extension Ratio of Semiflexible Polymer Glasses
复制标题
半柔性聚合物玻璃的裂纹延伸率
DOI:
10.1021/acs.macromol.3c01608
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发表时间:
2023
期刊:
影响因子:
5.5
通讯作者:
Hoy, Robert S.
中科院分区:
文献类型:
--
作者:
Nan, Kai;Hoy, Robert S.
Using molecular dynamics simulations, we show semiflexible bead–spring polymer glasses’ craze extension ratio, whereNeis their entanglement length andC∞is their Flory characteristic ratio, over the entire range of chain stiffnesses for which their parent melts remain isotropic (1 ≤Ne/C∞≲ 28). Kramer’s classic predictionqualitatively captures trends for flexible chains with smallC∞, but quantitatively fails badly over the entire range ofNe/C∞studied here because it incorrectly treats Kuhn segments as rigid and inextensible. As a consequence, polymer glasses withNe/C∞all the way down to the lower bound set by the onset of nematic order (Ne/C∞= 1) can exhibit a stable craze drawing and a ductile mechanical response.
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