Controlling the evolution of polypropylene microstructure during melt free radical modification using zinc dithiocarbamate with different N-substituted groups

Controlling the evolution of polypropylene microstructure during melt free radical modification using zinc dithiocarbamate with different N-substituted groups
复制标题

使用不同N-取代基团的二硫代氨基甲酸锌熔体自由基改性过程中控制聚丙烯微观结构的演变

DOI:
10.1016/j.polymdegradstab.2010.12.010
复制
发表时间:
2011-04
影响因子:
5.9
通讯作者:
Liu, Feng
Liu, Feng
中科院分区:
化学2区
文献类型:
--
作者:
Xing, Haiping;Tang, Tao;Wan, Dong;Wang, Lu;An, Yanjie;Jiang, Zhiwei;Zhang, Zhenjiang;Liu, Feng

文献摘要

参考文献

被引文献

相似文献

研究了二硫代氨基甲酸锌对聚丙烯(PP)在三官能度单体三羟甲基丙烷三丙烯酸酯(TMPTA)熔融自由基改性过程中的降解和支化作用。采用高温体积排阻色谱(HT-SEC)结合示差折光检测器(DRI)、光散射检测器(LSD)和粘度检测器(VD)和旋转流变仪对改性PP样品的微观结构进行了分析。在熔融自由基反应过程中,N-取代基的化学结构对PP微观结构的演变具有重要的控制作用。在N,N-二甲基二硫代氨基甲酸锌(ZDMC)的存在下,PP的链断裂得到控制,并形成大量的长链支化(LCB)部分。在没有助剂的情况下,PP的分子量显著降低,并且仅形成少量的LCB级分。重要的是,在这种情况下形成了大量的高度支化(微凝胶和超支化)结构。
The effects of zinc dithiocarbamates on degradation and branching of polypropylene (PP) were studied during melt radical modification using a tri-functional monomer (trimethylol propane triacrylate (TMPTA)). High-temperature size-exclusion chromatography (HT-SEC) coupled with differential refractive index detector (DRI), light scattering detector (LSD) and viscometer detector (VD) and rotational rheometry were used to analyse the microstructure of modified PP samples. The chemical structure of the N-substituted group showed an important influence in controlling the evolution of PP microstructure during melt radical reaction. The chain cleavage of PP was controlled in the presence of zinc N, N-dimethyldithiocarbamate (ZDMC), and a substantial long chain branched (LCB) fraction was formed. Without co-agent, the molecular weight of PP decreased measurably, and only a minor LCB fraction was formed. Importantly, considerable amounts of highly branched (microgel and hyperbranched) structures were formed in this case.
DOI: 10.1007/bf00396512
发表时间: 1996-11
期刊: Rheologica Acta
影响因子: 2.3
作者:
T. Pakuła;S. Geyler;Thomas M. Edling;D. Boese
通讯作者: T. Pakuła;S. Geyler;Thomas M. Edling;D. Boese
DOI: 10.1107/s0365110x65004619
发表时间: 1965-12
期刊: Acta Crystallographica
影响因子: --
作者:
M. Bonamico;G. Dessy;A. Mugnoli;A. Vaciago;L. Zambonelli
通讯作者: M. Bonamico;G. Dessy;A. Mugnoli;A. Vaciago;L. Zambonelli
DOI: 10.1016/j.polymer.2009.10.006
发表时间: 2009-11-27
期刊: POLYMER
影响因子: 4.6
作者:
Li, Shuzhao;Xiao, Miaomiao;Zheng, Anna
通讯作者: Zheng, Anna
DOI: 10.1002/app.1994.070540105
发表时间: 1994-10
影响因子: 3
作者:
K. Lederer;I. Beytollahi-Amtmann;J. Billiani
通讯作者: K. Lederer;I. Beytollahi-Amtmann;J. Billiani
DOI: 10.1002/(sici)1097-4628(19990929)73:14
发表时间: 1999-09
影响因子: 3
作者:
G. Crini;L. Janus;M. Morcellet;G. Torri;N. Morin
通讯作者: G. Crini;L. Janus;M. Morcellet;G. Torri;N. Morin