Study on Foaming Behavior of Poly(vinylidene fluoride)

doi:10.19491/j.issn.1001-9278.2019.10.007

Abstract

Abstract: Poly(vinylidene fluoride) (PVDF)/poly(N-vinyl pyrrolidone) (PVP) blends were prepared by a melt-blending method, and their crystallization and melting behaviors were investigated intensively. The results indicated that the crystallization temperature of PVDF domain decreased from 137.3 to 120.8 ℃ with an increase of PVP content, its crystallinity decreased from 39.5 % to 32.1 %, and its melting temperature was found to decrease slightly. The PVDF/PVP blends were further foamed using supercritical carbon dioxide as a physical foaming agent in autoclave. The investigation on forming performance demonstrated that the cell size and volume expansion ratio of the PVDF/PVP foams increased gradually with increasing the content of PVP and foaming temperature, and their cell density decreased slightly. Moreover, the cell size and cell density of the foams decreased with an increase of foaming pressure, but their volume expansion ratio was improved gradually.

Key words: poly (vinylidene fluoride), poly(N-vinyl pyrrolidone), supercritical carbon dioxide, foaming

CLC Number:

TQ328

WANG Minghao, WEI Shiyi, JIA Shuya, HAN Xiaolong, ZHOU Hongfu, WANG Xiangdong, YE Zhiyin. Study on Foaming Behavior of Poly(vinylidene fluoride)[J]. China Plastics, 2019, 33(10): 35-39.

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