非晶态聚合物导热的热阻网络模型
A Thermal Resistance Network Model for Heat Conduction of Amorphous Polymers
摘要：
绝大多数无定形聚合物的热导率（TC）在非常窄的范围内，0.1 $\sim$ 0.5 Wm $^{-1}$ K $^{-1}$，尽管单个聚合物链具有更高数量级的TC。高分子链的缠结在决定本体聚合物的相变温度方面起着重要的作用。提出了一个考虑分子链缠结的无定形聚合物中TC的热阻网络模型。我们的模型很好地解释了在无定形聚合物中观察到的普遍低TC的物理起源。从我们的模型可以成功地再现的压力和温度依赖性的TC的经验公式，不仅在固体聚合物，而且在聚合物熔体。我们进一步定量地解释了取向聚合物中的各向异性TC。
英文摘要：
Thermal conductivities (TCs) of the vast majority of amorphous polymers are in a very narrow range, 0.1 $\sim$ 0.5 Wm$^{-1}$K$^{-1}$, although single polymer chains possess TC of orders-of-magnitude higher. Entanglement of polymer chains plays an important role in determining the TC of bulk polymers. We propose a thermal resistance network (TRN) model for TC in amorphous polymers taking into account the entanglement of molecular chains. Our model explains well the physical origin of universally low TC observed in amorphous polymers. The empirical formulae of pressure and temperature dependence of TC can be successfully reproduced from our model not only in solid polymers but also in polymer melts. We further quantitatively explain the anisotropic TC in oriented polymers.
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