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.
Subject
Condensed Matter Physics,Ceramics and Composites
Cited by
9 articles.
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