聚（乙烯-醋酸乙烯酯）纳米复合材料在熔融态下的结晶动力学及相关电导率动力学

Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State.

作者信息

Stalmann Gertrud, Matic Aleksandar, Jacobsson Per, Tranchida Davide, Gitsas Antonis, Gkourmpis Thomas

机构信息

Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden.

Department of Physics, University of Gothemburg, 405 30 Göteborg, Sweden.

出版信息

Nanomaterials (Basel). 2022 Oct 14;12(20):3602. doi: 10.3390/nano12203602.

DOI:10.3390/nano12203602

PMID:36296791

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9612297/

Abstract

Nanocomposite systems comprised of a poly(ethylene vinyl acetate) (EVA) matrix and carbon black (CB) or graphene nanoplatelets (GNPs) were used to investigate conductivity and crystallisation dynamics using a commercially relevant melt-state mixing process. Crystallisation kinetics and morphology, as investigated by DSC and SEM, turn out to depend on the interplay of (i) the interphase interactions between matrix and filler, and (ii) the degree of filler agglomeration. For the GNP-based systems, an almost constant conductivity value was observed for all compositions upon cooling, something not observed for the CB-based compositions. These conductivity changes reflect structural and morphological changes that can be associated with positive and negative thermal expansion coefficients. GNP-based systems were observed to exhibit a percolation threshold of approximately 2.2 vol%, lower than the 4.4 vol% observed for the CB-based systems.

摘要

由聚（乙烯 - 醋酸乙烯酯）（EVA）基体和炭黑（CB）或石墨烯纳米片（GNP）组成的纳米复合体系，通过与商业相关的熔体状态混合工艺，用于研究导电性和结晶动力学。通过差示扫描量热法（DSC）和扫描电子显微镜（SEM）研究发现，结晶动力学和形态取决于以下两个因素的相互作用：（i）基体与填料之间的界面相互作用；（ii）填料的团聚程度。对于基于GNP的体系，在冷却时所有组成的电导率值几乎保持恒定，而基于CB的组成则未观察到这种情况。这些电导率变化反映了与正负热膨胀系数相关的结构和形态变化。观察到基于GNP的体系的渗流阈值约为2.2体积％，低于基于CB的体系所观察到的4.4体积％。