文献类型：期刊文献

英文题名：Effect of benzoic acid surface modified alumina nanoparticles on the mechanical properties and crystallization behavior of isotactic polypropylene nanocomposites

作者：Jiang, Xiaofeng[1];Zhang, Wenxue[2];Zhao, Shicheng[1];Zhou, Shuai[1];Shi, YaoQi[1];Xin, Zhong[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]PetroChina, Lanzhou Petrochem Res Ctr, Beijing 730060, Peoples R China

年份：2018

卷号：8

期号：37

起止页码：20790

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20182405307116);WOS:【SCI-EXPANDED(收录号:WOS:000434694300038)】；

基金：The authors gratefully acknowledge the financial support for this study by National Natural Science Foundation of China (Grants 21476085 and 21606084), National Key R&D Program of China (2016YFB0302201), and the Fundamental Research Funds for the Central Universities (222201717025).

语种：英文

外文关键词：Alumina - Nanocomposites - Aluminum oxide - Polypropylenes - Tensile strength - Conformations - Crystallization - Benzoic acid

摘要：The effect of benzoic acid (BA) surface modified alumina (Al2O3) nanoparticles (NPs) on the mechanical properties and crystallization behavior of isotactic polypropylene (iPP) nanocomposites was studied. Characterization of the modified Al2O3 NPs (BA-Al2O3) by FTIR and XRD analyses confirmed that benzoic acid molecules chemisorb on the surface of the NPs, forming benzene groups-rich microstructures. A considerable increase in the tensile strength, flexural modulus, and toughness was observed for the nanocomposites with only 0.2 wt% BA-Al2O3. Enhanced interfacial adhesion with the matrix was achieved, which enabled effective reinforcement of the nanocomposites. The higher crystallization temperature along with shorter crystallization halftime indicated the higher nucleation activity of BA-Al2O3. Furthermore, the interchain conformational ordering of iPP was significantly accelerated in the presence of the BA-Al2O3 NPs. The CH- interaction between the polymer and BA-Al2O3 NPs was considered to facilitate the attachment of the iPP chains and stimulate conformational ordering, crystallization, as well as mechanical properties of nanocomposites.