文献类型：期刊文献

英文题名：The Preparation and Characterization of Branching Poly(ethylene terephthalate) and its Foaming Behavior

作者：Liu, Haiming Wang, Xiangdong Zhou, Hongfu Liu, Wei Liu, Bengang

第一作者：Liu, Haiming

通信作者：Wang, XD[1]

机构：[1]Beijing Technol & Business Univ, Sch Mat & Mech Engn, Beijing 100048, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Met Engn, Guizhou 550001, Peoples R China

第一机构：Beijing Technol & Business Univ, Sch Mat & Mech Engn, Beijing 100048, Peoples R China

通信机构：corresponding author), Beijing Technol & Business Univ, Sch Mat & Mech Engn, Beijing 100048, Peoples R China.

年份：2015

卷号：34

期号：2

起止页码：63-94

外文期刊名：CELLULAR POLYMERS

收录：;EI(收录号：20152300918092);Scopus(收录号：2-s2.0-84930322449);WOS:【SCI-EXPANDED(收录号:WOS:000352335300002)】；

基金：This work was supported by Chinese Ministry of Science and Technology [grant number 2013EG111219].

语种：英文

外文关键词：Poly(ethyleneterephthalate); Chain extender; Branching; Degradation; Foam

摘要：Chain extension was an effective method for increasing the molecular weight, the melt strength and the foaming property of linear polymer In this paper, pyromellitic dianhydride (PMDA) was used as chain extender to improve these properties of linear poly (ethylene terephthalate) (PET). The intrinsic viscosity rheological and thermal characterizations of various PET samples was investigated. The results demonstrated that the increasement of the viscoelasticity at low frequencies was correlated to the raise of the intrinsic viscosity and the formation of long chain branching. These structural changes resulted in the decreasement of the crystallization temperature and melt temperature as well as the increase in the cold crystallization values with the increasing content of PMDA. The cellular morphology and expansion ratio of CEPET foams were also obviously improved by the introduction of PMDA. The expansion ratio of CEPET foam with the PMDA content of 1.0 phr would reach 31.78. In addition, the effect of the chain extension reaction time on the intrinsic viscosity the rheological behavior; and foaming properties of PET were also studied. The results showed that the intrinsic viscosity the rheological behavior; and the foamability of CEPET also decreased gradually with increasing chain extension reaction time, which should be attributed to the occurrence of more and more intense thermal degradation.