Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Zhonglei Ma, Guangcheng Zhang, Quan Yang, Xuetao Shi, Yang Liu

科研成果: 期刊稿件文章同行评审

29 引用 (Scopus)

摘要

This article reports on the compressive, dynamic mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions fabricated using the environment-friendly supercritical carbon dioxide. The effects of cell morphologies such as relative density, cell-size distribution and porosity on the compressive strength, Young's modulus, storage modulus, loss modulus, dielectric constant and loss tangent of the microcellular polycarbonate foams are investigated quantitatively. Experimental values of the compressive strength and Young's modulus fit very well with the theoretical values calculated from the Gibson-Ashby model at low relative densities. The higher relative density leads to higher storage modulus and loss modulus. The bimodal foams significantly improve the compressive and dynamic mechanical properties compared to the unimodal foams with the same relative density. The dielectric properties of microcellular foams depend only on the total porosity, but not on the cell-size distribution or microstructure of the foams. With increasing porosity, the dielectric constant of the microcellular foams gradually decreases, and agrees very well with the curve calculated from the Maxwell-Garnett-spheres model.

源语言英语
页(从-至)307-327
页数21
期刊Journal of Cellular Plastics
51
3
DOI
出版状态已出版 - 6 5月 2015

指纹

探究 'Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions' 的科研主题。它们共同构成独一无二的指纹。

引用此