Preparation and properties of dynamically cured polypropylene (PP)/maleic anhydride–grafted polypropylene (MAH-g-PP)/calcium carbonate (CaCO3)/epoxy composites

Author:

Jiang Xueliang1,Fan Yihong1,Li Fan1

Affiliation:

1. School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China

Abstract

In this study, an epoxy resin was dynamically cured in a polypropylene (PP)/maleic anhydride–grafted polypropylene (MAH-g-PP)/calcium carbonate (CaCO3) matrix to prepare dynamically cured PP/MAH-g-PP/CaCO3/epoxy composites. The torque measurement shows that the addition of epoxy resin into the PP/MAH-g-PP/CaCO3 composites results in a slight increase in the torque at equilibrium, and epoxy resin in the composites has been cured by 2-ethylene-4-methane-imidazole (EMI-2,4). Scanning electron microscopic analysis shows that dual compatibilizers composed of MAH-g-PP and an epoxy resin were demonstrated to effectively compatibilize the immiscible PP/CaCO3 composites. MAH-g-PP with a low MAH content is miscible with PP to make it quasi-functionalized, while the epoxy resin can react with MAH-g-PP and hydroxyl groups at the CaCO3 surface. Thus the formed MAH-g-PP-co-epoxy-co-CaCO3 copolymer at the interface is able to anchor along the interface and serve as an efficient compatibilizer. Dynamic cure of the epoxy resin can further increase the interaction adhesion in the PP/CaCO3 composites. The epoxy resin does not show compatibilization effects for the PP/CaCO3 composites without the presence of MAH-g-PP. The shift of crystallization peaks to the higher temperature suggests that the CaCO3 filler in the composites can act as a nucleating agent, accelerating the crystallization of PP component, and the PP/CaCO3 composites compatibilized by MAH-g-PP and the epoxy resin have higher crystallization peaks. This shows that an increase in the interaction adhesion between the CaCO3 and PP matrix, improving the nucleating activity of the filler and promoting crystallization of PP. Thermogravimetric analysis shows that the incorporation of the CaCO3 into the PP could improve the thermal stability of PP, and the addition of MAH-g-PP and the epoxy resin into the composites obviously could further improve the thermal stability. The mechanical properties of PP/MAH-g-PP/CaCO3 and PP/MAH-g-PP/CaCO3/epoxy composites are better than that of the PP/CaCO3 composites. The PP/MAH-g-PP/CaCO3/epoxy/EMI-2,4 composites have the best mechanical properties in all the PP/CaCO3 composites, which is attributed to the better interaction adhesion. The suitable content of epoxy resin is about 5 wt% in the presence of MAH-g-PP in the PP/CaCO3 composites, while an excess epoxy resin of above 5 wt% acts as an organic filler for PP.

Publisher

SAGE Publications

Subject

Condensed Matter Physics,Ceramics and Composites

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3