Processing Pathways Decide Polymer Properties at the Molecular Level
Processing Pathways Decide Polymer Properties at the Molecular Level
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DOI：
10.1021/acs.macromol.9b01195
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发表时间：
2019-10-08
期刊：
影响因子：
5.5
通讯作者：
Reiter, Guenter
中科院分区：
文献类型：
--
作者：
Chandran, Sivasurender;Baschnagel, Jorg;Reiter, Guenter
快速加工的条件通常会促使聚合物采用非平衡分子构象，这反过来又会导致结构、动力学和机械性能与热力学平衡时的性能明显不同。然而，尽管有可能控制所需的非平衡性能的聚合物，严格的微观理解的加工性能的关系是目前缺乏的。为了刺激沿着这一方向的进展，我们在这里集中在三个典型的和显然不同的情况下：旋涂聚合物薄膜，快速拉伸聚合物纤维，剪切聚合物熔体。在选定的情况下，常见的观察存在的启发，我们搜索序参数，例如，拓扑相关性和异质性，这可能允许表征加工诱导的行为的聚合物。我们强调，这种方法，需要从理论，模拟和实验的协同努力，可以提供一个深刻的理解，导致聚合物的可预测和可调的性能。
Conditions of rapid processing often drive polymers to adopt nonequilibrium molecular conformations, which, in turn, can give rise to structural, dynamical, and mechanical properties that are significantly different from those in thermodynamic equilibrium. However, despite the possibility to control the desired nonequilibrium properties of polymers, a rigorous microscopic understanding of the processing-property relations is currently lacking. In an attempt to stimulate progress along this topical direction, we focus here on three prototypical and apparently different cases: spin-coated polymer films, rapidly drawn polymer fibers, and sheared polymer melts. Inspired by the presence of common observations in the chosen cases, we search for order parameters as, for example, topological correlations and heterogeneities, which may allow characterizing the processing-induced behavior of polymers. We highlight that such approaches, necessitating concerted efforts from theory, simulations, and experiments, can provide a profound understanding leading to predictable and tunable properties of polymers.