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Melt foamability of reactive extrusion‐modified poly(ethylene terephthalate) with pyromellitic dianhydride using supercritical carbon dioxide as blowing agent
Author(s) -
Xia Tian,
Xi Zhenhao,
Liu Tao,
Pan Xun,
Fan Chaoyang,
Zhao Ling
Publication year - 2015
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23995
Subject(s) - materials science , pyromellitic dianhydride , supercritical carbon dioxide , blowing agent , reactive extrusion , extrusion , supercritical fluid , chemical engineering , ethylene , crystallization , rheology , composite material , isothermal process , polymer chemistry , organic chemistry , layer (electronics) , chemistry , catalysis , polyimide , physics , polyurethane , thermodynamics , engineering
By reactive extrusion with pyromellitic dianhydride (PMDA), foamable poly(ethylene terephthalate) (PET) was obtained, which achieved a maximum intrinsic viscosity of 1.36 dL/g with PMDA content 0.8 wt%. Dynamic shear rheological properties were measured to characterize the structure evolution of modified PET. And the Avrami analysis was extended for the non‐isothermal crystallization process of modified PET, which relates to cell stabilization in the melt foaming process. Based on the batch foaming process with supercritical carbon dioxide as blowing agent, broad foaming temperature windows were obtained for PETs modified with 0.8 and 0.5 wt% PMDA, in which PET foams with the expansion ratio between 10 and 50 times, the cell diameter between 15 and 37 μm, and the cell density between 6.2 × 10 8 and 1.6 × 10 9 cells/cm 3 were controllably produced. POLYM. ENG. SCI., 55:1528–1535, 2015. © 2014 Society of Plastics Engineers