Heterogeneous Distribution of Entanglements in a Nonequilibrium Polymer Melt of UHMWPE: Influence on Crystallization without and with Graphene Oxide
作者： Kangsheng Liu , Ele L. de Boer , Yefeng Yao , Dario Romano , Sara Ronca
DOI: 10.1021/ACS.MACROMOL.6B01173
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摘要: In the past, studies have been performed to follow chain dynamics in an equilibrium polymer melt using low molar mass polymers. Here we show that linear ultrahigh molecular weight polyethylene entanglements formed during or after polymerization are influencing differently overall topology of melt. When a disentangled UHMWPE sample is crystallized under isothermal conditions melting, two endothermic peaks observed. The high temperature peak related melting crystals obtained on crystallization from domains heterogeneous (nonequilibrium) melt, whereas entangled On increasing annealing time enthalpy lower increases at expense due transformation nonequilibrium into one. However, indep...
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