文献类型：期刊文献

英文题名：Influence of polypropylene topological structure evolution during melt branching reactive processing on its melt performances

作者：Yang, Le Jiang, Tuanhui Gong, Wei He, Li Luo, Zhu Zhang, Chun

第一作者：Yang, Le

通信作者：Luo, Z[1];Zhang, C[2]|[14440f6a6d277849ce3bf]张纯;

机构：[1]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Guizhou, Peoples R China;[2]Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Guizhou, Peoples R China;[3]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Guiyang 550025, Guizhou, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Guiyang 550025, Guizhou, Peoples R China;corresponding author), Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Peoples R China.|贵州理工学院材料与冶金工程学院;贵州理工学院;

年份：2018

卷号：29

期号：8

起止页码：2300-2307

外文期刊名：POLYMERS FOR ADVANCED TECHNOLOGIES

收录：;EI(收录号：20182205265404);Scopus(收录号：2-s2.0-85047662109);WOS:【SCI-EXPANDED(收录号:WOS:000437840000016)】；

基金：National Engineering Research Center for Compounding and Modification of Polymer Materials; Technology Project of Guizhou Province China

语种：英文

外文关键词：long chain branched (LCB); melt performance; polypropylene (PP); rheology; topological structure

摘要：Gel-free long-chain-branched polypropylene (LCBPP) was prepared by the melt radical branching reaction in the presence of peroxide initiator 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane peroxide, zinc dimethyldithiocarbamate, and trimethylolpropane triacrylate in a torque rheometer. It could be inferred that recombination between PP chains via radical coupled reaction took place and trimethylolpropane triacrylate was grafted onto PP backbone by the torque curves and Fourier transformed infrared spectroscopy results. The presence of long chain branches (LCB) for modified PP was verified by the gel permeation chromatography measurements and vGP plots. On the other hand, it was found that the topological structure of PP chains transformed from linear form to a long star-like shape during the reaction progress, and the topological structure was directly determined by the radical reaction time. The topological structure of PP would further impact its melt behaviour. After complete melting of raw PP, sparse and long LCBPP firstly generated which possessed high melt strength owing to the increasing entanglement of long branching chains. And at the time corresponding to the summit of reaction peak on the torque curve, the modified LCBPP possess the highest melt strength owing to its long star topological structure. While as reaction time was prolonged, severe degradation of the LCBPPs would take place under too long mixing time and dense and short branches generated due to the residual radicals, with a sharp decline in melt strength.