Abstract

The purpose of the present study was to compare the tensile and impact performances of foams of PP/γ-irradiated elastomer blends with that of the foams of PP/unirradiated elastomer blends. Furthermore, the morphological and crystallinity studies were considered to correlate the tensile and impact behavior of foams. Foaming of blends was carried out in a batch foaming set up with supercritical CO₂. A continuous decrease in crystallinity was observed for both types of blends along with the relative change in the number of different crystal forms. Remarkable necking phenomenon and strain-induced crystallization were observed in foams. The tensile modulus of samples significantly increased up to 3 times than that of the neat samples at lower temperature foaming. The maximum modulus of foams was attained for the blends with 10% irradiated elastomer concentration. The impact strength of foam was also improved at the same condition, where the tensile modulus was highest.

摘要

本研究的目的是比较 PP/γ-辐照弹性体共混物泡沫与 PP/未辐照弹性体共混物泡沫的拉伸和冲击性能。此外，形态学和结晶度研究被认为与泡沫的拉伸和冲击行为相关。共混物的发泡是在使用超临界 CO ₂的间歇发泡装置中进行的. 观察到两种共混物的结晶度持续降低，同时不同晶型数量的相对变化。在泡沫中观察到显着的颈缩现象和应变诱导结晶。在较低温度发泡下，样品的拉伸模量比纯样品的拉伸模量显着增加了 3 倍。具有 10% 辐照弹性体浓度的共混物达到了泡沫的最大模量。在拉伸模量最高的相同条件下，泡沫的冲击强度也有所提高。