Preparation and Performance of PP/EVA Foamed Composite Materials

doi:10.19491/j.issn.1001-9278.2021.03.004

Abstract

Abstract:

PP/EVA foamed composite materials were prepared by a chemical-mold foaming method using high-melt strength polypropylene （PP） and ethylene-vinyl acetate （EVA） as raw materials， and their structure and performance were characterized by using differential scanning calorimeter， scanning electron microscope， rotational rheometer， and other equipment. The effect of EVA content on their foaming performance and mechanical properties were also investigated. The results indicated that there was no significant change in the crystallinity of PP with the addition of EVA. The formed composite materials at an EVA content of 5 wt% achieved a significant improvement in flexural strength from 10.8 to 15.5 MPa compared to pure PP forming material. However， there is little effect on tensile strength. The formed composite materials also presented a decrease in cell pore size from 68.36 to 33.58 μm in the presence of EVA， and their pore size distribution became more uniform. In addition， the formed composite materials containing 5 wt% EVA achieved a maximum cell density and a minimum average cell diameter with the most concentrated size distribution.

Key words: ethylene-vinyl acetate, polypropylene, molded foam, cell pore size, crystallinity

CLC Number:

TQ320

ZHANG Jing, LI Xiaoqing, ZHOU Haiying, JIANG Wenzheng, ZHONG Jinhuan, LI Wenzhu, ZHANG Wenbiao. Preparation and Performance of PP/EVA Foamed Composite Materials[J]. China Plastics, 2021, 35(3): 23-29.

Figures/Tables 6

样品编号	PP/%	EVA/%	AC/%	ZnO/%	CaCO₃/%
1	100	0	1	0.5	4
2	95	5	1	0.5	4
3	90	10	1	0.5	4
4	85	15	1	0.5	4
5	80	20	1	0.5	4
6	75	25	1	0.5	4
7	70	30	1	0.5	4

Tab.1. Proportions of the components in the mixed system

Fig.1. DSC curves and crystallinity of PP/EVA composites with different contents of EVA

Fig.2. Cell structures of PP/EVA foamed composite materials

Fig.3. Distribution of pore sizes，variation of average cell size and cell density of different molded PP/EVA foamed composites

Fig.4. Rheological curves of PP/EVA blends with different contents of EVA

Fig.5. Bending strength and tensile strength of various samples

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