화학공학소재연구정보센터
Polymer(Korea), Vol.43, No.5, 665-673, September, 2019
응고분석을 이용한 냉각환경에 따른 Poly(lactic acid)/Graphene 복합체의 비등온 결정 동역학에 대한 연구
Evaluation of Non-isothermal Melt Crystallization Kinetics of thePoly(lactic acid)/Graphene Composites under Variant Cooling Circumstances via Solidification Analysis Approach
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The poly(lactic acid) (PLA)/graphene (GN) composites were prepared by solution blending. An in situ measurement technique was adopted to examine the non-isothermal crystallization of PLA/GN composites, which was different from the typical circumstances at constant cooling rate in DSC. The rheological properties of the samples were investigated, and the Carreau-A model was applied to non-linearly fit the rheological data. The non-isothermal crystallization kinetics and solidification behaviors at variant cooling rates were investigated using a modified version of Avrami equation by Jeziorny coupled with three-parameter model (TPM) and four-parameter model (FPM). Our findings showed that the viscosity of the PLA/GN composites dropped with increasing shear rate or GN content. Crystallization kinetic analysis suggested that GN served as an effective nucleating agent for PLA under non-isothermal melt crystallization conditions with variant cooling rate.
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