Modification of sodium bicarbonate and its effect on foaming behavior of polypropylene

Author:

Luo Dan12,Pei Xianglin12,Fu Hai12,Yang Xin1,Long Siyu1,Zhang Linyu1,Gong Wei12

Affiliation:

1. School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China

2. Guizhou Functional Polymer Materials Science and Technology Innovation Talent Team , Guiyang 550025 , China

Abstract

Abstract As a potential physical blowing agent, sodium bicarbonate (SB) is environmentally friendly and low in cost, but its low decomposition temperature cannot meet the requirements of polyolefin foam materials. Herein, for enhancing the thermal properties of SB, a modified way was offered to fabricate various SB-based capsules via suspension polymerization. As the modified SB-based capsules, epoxy resin (EP) accompanied with several organic acids was successfully coated on the surface of SB, serving as heat-insulation layer of SB. Various physicochemical characterizations provided reliable evidences for the good coating effect, and the thermal performance of the modified SB was improved. Further, the composite SB capsules were applied for the foaming of polypropylene (PP), and the foaming behavior of the SB-based capsules in PP was significantly improved, with more uniform distribution, smaller cell diameter, and higher cell density. In all, this work fully proved that the coated shells enhanced the thermal properties of SB, and the modified SB capsules significantly improved the foaming quality of foamed PP.

Publisher

Walter de Gruyter GmbH

Subject

Polymers and Plastics,Physical and Theoretical Chemistry,General Chemical Engineering

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