• 文献标题:   Enhanced cold crystallization and dielectric polarization of PLA. composites induced by P[MPEGMA-IL] and graphene
  • 文献类型:   Article
  • 作  者:   XU P, LUO X, ZHOU YY, YANG YW, DING YS
  • 作者关键词:   pla, graphene, ionic liquid, cold crystallization, dielectric polarization
  • 出版物名称:   THERMOCHIMICA ACTA
  • ISSN:   0040-6031 EI 1872-762X
  • 通讯作者地址:   Hefei Univ Technol
  • 被引频次:   4
  • DOI:   10.1016/j.tca.2017.10.005
  • 出版年:   2017

▎ 摘  要

To investigate the effect of modified graphene (Gra) by poly(methoxy poly(ethylene glycol) monomethacrylate-co-l-vinyl-3-ethylimidazolium bromide) (P[MPEGMA-IL]) on crystallization and dielectric behavior for poly (lactic acid) (PLA), the neat PLA and its composites were fabricated via solution blending and hot pressing. P [MPEGMA-IL.] can improve the dispersibility of Gra in PLA matrix. The crystallization rate of PLA composites was increased with increasing the content of P [MPEGMA-IL] and Gra due to the plasticizing effect of P [MPEGMA-IL] and the nucleating effect of better-dispersed Gra. In the frequency spectra of PLA composites treated by cold crystallization process, cc relaxation and interfacial polarization resulted in high values of dielectric permittivity. The incorporation of modified Gra into the matrix can accelerate interfacial polarization. The effect of modified Gra on charge carrier movement mechanism was resulted from the increase of the mobile charge carriers at the interphase and the dielectric strength of interfacial polarization.