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Open AccessArticle

Effect of Compatibility on the Foaming Behavior of Injection Molded Polypropylene and Polycarbonate Blend Parts

by Bei Su 1, Ying-Guo Zhou 1,2,*, Bin-Bin Dong 2,* and Cao Yan 1
1
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China
2
National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, Henan 450001, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(2), 300; https://doi.org/10.3390/polym11020300
Received: 25 December 2018 / Revised: 1 February 2019 / Accepted: 1 February 2019 / Published: 11 February 2019
(This article belongs to the Special Issue Foaming and Injection Moulding in Polymer Processing)
To improve the foaming behavior of a common linear polypropylene (PP) resin, polycarbonate (PC) was blended with PP, and three different grafted polymers were used as the compatibilizers. The solid and foamed samples of the PP/PC 3:1 blend with different compatibilizers were first fabricated by melt extrusion followed by injection molding (IM) with and without a blowing agent. The mechanical properties, thermal features, morphological structure, and relative rheological characterizations of these samples were studied using a tensile test, dynamic mechanical analyzer (DMA), scanning electron microscope (SEM), and torque rheometer. It can be found from the experimental results that the influence of the compatibility between the PP and PC phases on the foaming behavior of PP/PC blends is substantial. The results suggest that PC coupling with an appropriate compatibilizer is a potential method to improve the foamability of PP resin. The comprehensive effect of PC and a suitable compatibilizer on the foamability of PP can be attributed to two possible mechanisms, i.e., the partial compatibility between phases that facilitates cell nucleation and the improved gas-melt viscosity that helps to form a fine foaming structure. View Full-Text
Keywords: compatibility; PP/PC; foaming; injection molding compatibility; PP/PC; foaming; injection molding
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MDPI and ACS Style

Su, B.; Zhou, Y.-G.; Dong, B.-B.; Yan, C. Effect of Compatibility on the Foaming Behavior of Injection Molded Polypropylene and Polycarbonate Blend Parts. Polymers 2019, 11, 300.

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