Kim Myounguk, Lee Jungmin, Roh Hyun-Gyoo, Kim Dahyun, Byeon Juhee, Park Jongshin
Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea.
Research Institute for Agriculture and Life Sciences, Seoul 08826, Korea.
Polymers (Basel). 2017 Sep 21;9(10):460. doi: 10.3390/polym9100460.
In this study, a PPS/MWCNTs composite was prepared with poly(phenylene sulfide) (PPS), as well as pristine and covalent functionalized multi-walled carbon nanotubes (MWCNTs) via melt-blending techniques. Moreover, the dispersion of the MWCNTs on the PPS matrix was improved by covalent functionalization as can be seen from a Field-Emission Scanning Electron Microscope (FE-SEM) images. The thermal properties of the PPS/MWCNTs composites were characterized using a thermal conductivity analyzer, and a differential scanning calorimeter (DSC). To analyze the crystallization behavior of polymers under conditions similar with those in industry, the non-isothermal crystallization behaviors of the PPS/MWCNTs composites were confirmed using various kinetic equations, such as the modified Avrami equation and Avrami-Ozawa combined equation. The crystallization rate of PPS/1 wt % pristine MWCNTs composite (PPSP1) was faster because of the intrinsic nucleation effect of the MWCNTs. However, the crystallization rates of the composites containing covalently-functionalized MWCNTs were slower than PPSP1 because of the destruction of the MWCNTs graphitic structure via covalent functionalization. Furthermore, the activation energies calculated by Kissinger's method were consistently decreased by covalent functionalization.
在本研究中，通过熔融共混技术，用聚苯硫醚（PPS）以及原始的和共价功能化的多壁碳纳米管（MWCNTs）制备了PPS/MWCNTs复合材料。此外，从场发射扫描电子显微镜（FE-SEM）图像可以看出，通过共价功能化改善了MWCNTs在PPS基体上的分散性。使用热导率分析仪和差示扫描量热仪（DSC）对PPS/MWCNTs复合材料的热性能进行了表征。为了分析聚合物在与工业条件相似的条件下的结晶行为，使用各种动力学方程，如修正的阿弗拉米方程和阿弗拉米-小泽组合方程，确定了PPS/MWCNTs复合材料的非等温结晶行为。由于MWCNTs的固有成核作用，PPS/1 wt%原始MWCNTs复合材料（PPSP1）的结晶速率更快。然而，由于共价功能化破坏了MWCNTs的石墨结构，含有共价功能化MWCNTs的复合材料的结晶速率比PPSP1慢。此外，通过基辛格方法计算的活化能通过共价功能化持续降低。
