文献类型：期刊文献

英文题名：Melt Foamability of Poly(ethylene terephthalate)/Clay Nanocomposites Prepared by Extrusion Blending in the Presence of Pyromellitic Dianhydride

作者：Xia, Tian[1];Xi, Zhenhao[1];Yi, Xuefeng[1];Liu, Tao[1,2];Zhao, Ling[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：54

期号：27

起止页码：6922

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20152901038652);WOS:【SCI-EXPANDED(收录号:WOS:000358395100011)】；

基金：The authors are grateful to the National Natural Science Foundation of China (Grant No. 21306043), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120074120019), the Fundamental Research Funds for the Central Universities, and the 111 Project (No. B08021).

语种：英文

外文关键词：Nanocomposites - Polyethylene terephthalates - Ethylene - Extrusion - Foams - Crystallization - Nucleation - Viscoelasticity - Molecular weight - Blowing agents

摘要：Exfoliated poly(ethylene terephthalate) (PET)/organoclay nanocomposites were prepared by extrusion blending method with different clay contents and molecular weights, of raw PET. Pyromellitic dianhydride (PMDA) was extruded, together with PET and day, to introduce long-chain branching to PET backbone and delaminate the,clay layers. Although the molecular weights and viscoelastic properties of nanocomposites were much lower than those of foamable PMDA-modified PET, the melt foamability of nanocomposites was significantly improved by the well-dispersed clays due to the heterogeneous nucleation effect, enhanced nonisothermal crystallization rate, and so on. Foaming temperature windows with a width of 20-60 degrees C Were explored for PET/day nanocomposites with intrinsic viscosities of 0.67-0.94 dL/g,, in which nanocomposites foams with cell diameters of 29-53 mu m, cell densities of 6.5 x 10(7)-6.9 x 10(8) cells/cm(3), and expansion ratio of 10-50 could be controllably produced using supercritical CO2 as a blowing agent.