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| 1 | Local Transient Jamming in Stress Relaxation of Bulk Amorphous Polymers显示文摘Bulk amorphous polymers become stretched and parallel-aligned under loading stress,and their intermolecular cooperation slows down the subsequent stress relaxation process.By means of dynamic Monte Carlo simulations,we employed the linear viscoelastic Maxwell model for stress relaxation of single polymers and investigated their intermolecular cooperation in the stress relaxation process of stretched and parallel-aligned bulk amorphous polymers.We carried out thermal fluctuation analysis on the reproduced Debye relaxation and Arrhenius fluid behaviors of bulk polymers.We found a transient state with stretch-coil coexistence among polymers in the stress relaxation process.Further structure analysis revealed a scenario of local jamming at the transient state,resulting in an entropy barrier for stretch-coil transition of partial polymers.The microscopic mechanism of intermolecular cooperation appears as unique to polymer stress relaxation,which interprets the hydrodynamic interactions as one of essential factors raising a high viscosity in bulk amorphous polymers.Our simulations set up a platform of molecular modeling in the study of polymer stress relaxation,which brought new insights into polymer dynamics and the related mechanical/rheological properties. | Ji-Ping Wang Yi-Huan Yu Ya-Qian Guo Wen Luo Wen-Bing Hu | 2021 | Chinese Journal of Polymer Science2021，39，7： | 1 |
| 2 | 静荷载作用下聚乙烯管材的粘弹塑性模型及流线扩散数值分析显示文摘聚乙烯管材在工程应用中占有极大比重,而在长期服役过程中管材常受静荷载作用。故而研究其粘弹性、粘塑性等本质力学行为对掌握聚乙烯管材的变形与应力规律进而指导工程实践具有重要意义。文章通过对聚乙烯材料及聚乙烯管材的室内应力松弛试验,找到了适合聚乙烯管材的Maxwell模型。再利用流线扩散有限元方法对聚乙烯管材静荷载作用下的粘弹塑性力学行为进行分析,同时利用Prony级数对其进行对比计算以验证SDM分析的准确性。结果表明:在静荷载作用下应力在开始阶段增大,到达一定值后开始随时间增加逐渐减小。而SDM分析值与Prony级数计算值相差无几,该方法及模型可用于聚乙烯管材的应力及变形分析。 | 李月丽 袁盛峰 | 2020 | 贵阳学院学报(自然科学版)2020，15，2： | 0 |
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