高剪切速率下短链高分子熔体的非线性流变学行为

来源 :2014年大分子体系理论、模拟与计算研讨会 | 被引量 : 0次 | 上传用户:orc2008
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  在高剪切速率下,高分子熔体的非线性响应是高分子物理学中的热点问题。近年来,大量的实验和模拟数据显示,与缠结高分子熔体类似,在高剪切速率下短链高分子熔体也出现了一些非线性流变学行为;例如:应力过冲、剪切变稀等。这些现象不能很好地通过现有理论来解释,例如:经典的Rouse模型理论;然而,这些非线性流变学行为无论在理论方面,还是在实际应用方面对整个非线性流变学研究与应用都至关重要。在本工作中,我们通过布朗动力学模拟,观测到了在高剪切速率下短链高分子的一些重要非线性流变学现象,以及这些现象所对应的分子链运动过程;进一步地,我们还研究链间相互作用力的传递过程,以及与链内作用力的关系。这些研究结果可促进人们对短链高分子流变行为的理解。
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