【摘要】 以聚偏氟乙烯（PVDF）为基体,加入不同含量的聚乙烯吡咯烷酮（PVP）,经熔融共混后,制备PVDF/PVP共混物。然后,以超临界二氧化碳（CO₂）为物理发泡剂,通过间歇式釜压发泡法制备高发泡倍率的PVDF/PVP泡沫。结果表明,随着PVP含量的增加,PVDF的结晶温度从137.3℃降到120.8℃,熔融温度略有下降,结晶度从39.5%下降到了32.1%;随着PVP含量和发泡温度的增加,泡孔尺寸和发泡倍率逐渐增加,泡孔密度略有下降;随发泡压力的增加,泡孔尺寸逐渐减小,泡孔密度和发泡倍率逐渐增加。更多还原

【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.更多还原