文献类型：期刊文献

英文题名：The Crystallization Behavior of Isotactic Polypropylene Induced by a Novel Antinucleating Agent and Its Inhibition Mechanism of Nucleation

作者：Zhao, Shicheng[1];Yu, Xin[1];Gong, Hanzhang[1];Xin, Zhong[1];Shi, Yaoqi[2];Zhou, Shuai[1]

机构：[1]E China Univ Sci & Technol, Dept Product Engn, State Key Lab Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]Shanghai Res Inst Chem Ind, Shanghai Key Lab Catalysis Technol Polyolefins, Shanghai, Peoples R China

年份：2015

卷号：54

期号：31

起止页码：7650

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20153201122113);WOS:【SCI-EXPANDED(收录号:WOS:000359613500010)】；

基金：We gratefully acknowledge National Science Foundation of China (Grants 21476085 and 21106042) for financial support.

语种：英文

外文关键词：Polypropylenes - Differential scanning calorimetry - Crystallization kinetics - Growth kinetics - Transmission control protocol - Zinc compounds

摘要：The addition of foreign substances is well-known to be able to improve the crystallization of isotactic polypropylene (iPP) following a nucleation-promoting mechanism. In the present work, however, we found that zinc salt of 1, 4, 5, 6, 7, 7-hexachlorobicyclo [2.2.1] hept-5-ene-2, 3-dicarboxylic acid (HCHD-Zn) unexpectedly decreased the crystallization temperature (T-cp) and crystallization rate of iPP, generating remarkable antinucleation effects. The results of differential scanning calorimetry (DSC) and polarized optical microscopy (POM) showed T-cp of iPP decreased more than 4 degrees C and nucleation densities of iPP decreased nearly 70% upon the addition of the "anti-nucleating agent" HCHD-Zn. Isothermal crystallization kinetics indicated HCHD-Zn lowered the crystallization kinetic constant k of iPP but had similar Avrami exponent with neat iPP, which revealed HCHD-Zn hindered the crystallization of iPP but did not change the type of nucleation and growth geometries of iPP. We proposed a mechanism of antinucleation of iPP upon the addition of HCHD-Zn from a structural perspective. Hydrogens on the tertiary carbons in the melt of iPP may react with the chlorine in the HCHD-Zn particles dispersed within. The removal of hydrochloride left a 3D network of iPP chains cross-linked by HCHD-Zn particles. Therefore, the restricted movement of polymer chains inhibited the nucleation of iPP.