On the origin of brittle fracture of entangled polymer solutions and melts
On the origin of brittle fracture of entangled polymer solutions and melts
复制标题
缠结聚合物溶液和熔体脆性断裂的起源
DOI：
10.1122/1.4995497
复制
发表时间：
2018
影响因子：
3.3
通讯作者：
Qian Huang
中科院分区：
文献类型：
--
作者：
M. Wagner;Esmaeil Narimissa;Qian Huang
提出了缠结聚合物液体脆性断裂的新标准：当缠结链段的应变能达到共价键的能量时，主 C-C 键的断裂就会引发裂纹。热波动导致应变能短时集中在缠结链段的一个 C-C 键上，从而导致链断裂。这将纠缠段的最大可实现拉伸限制为 fc≤6 的临界拉伸。黄等人的最新实验数据。 [物理。莱特牧师。 117, 087801 (2016)]] 以及 Huang 和 Hassager [Soft Matter 13, 3470–3474 (2017)] 关于溶解在低聚苯乙烯中的近单分散聚苯乙烯溶液和良好表征的多分散聚苯乙烯熔体的断裂，与该断裂准则大体一致。为了达成定量一致，必须考虑有限的可扩展性效应。
A novel criterion for brittle fracture of entangled polymer liquids is presented: Crack initiation follows from rupture of primary C–C bonds, when the strain energy of an entanglement segment reaches the energy of the covalent bond. Thermal fluctuations lead to a short-time concentration of the strain energy on one C–C bond of the entanglement segment, and the chain ruptures. This limits the maximum achievable stretch of entanglement segments to a critical stretch of fc≤6. Recent experimental data of Huang et al. [Phys. Rev. Lett. 117, 087801 (2016)]] and Huang and Hassager [Soft Matter 13, 3470–3474 (2017)] on fracture of solutions of nearly monodisperse polystyrenes dissolved in oligomeric styrene and of a well characterized polydisperse polystyrene melt, are in general agreement with this fracture criterion. For quantitative agreement, finite extensibility effects have to be considered.