In this work, rheological properties of a novel fabricated random high impact polypropylene-based copolymer, PBE, which possessed excellent properties of transparency and impact resistance, were studied. The studying included shearing stress, apparent shearing viscosity, viscous flow activation energy, extrudate swelling ratio, melt strength and melt extrusion morphology et al. The study was based on a capillary rheometer using RPB and RPE; both are used extensively at present, and the processing technologies are mature, as control. Based on the study, the following results arrived. Firstly, PBE is a pseudoplastic fluid and the processing methods used for RPE and RPB are fully applicable to PBE. Secondly, PBE presented the highest “shearing sensitivity” among above-adopted samples, and temperature and shearing rate showed the greatest influence on the rheological properties of PBE. Thirdly, the melt strength of PBE was significantly lower than that of RPB and RPE, but greatly varied with temperature, which indicated that injection molding was the most suitable for PBE. Finally, the study was also found that at a given shearing rate, the extruded swelling ratio of PBE was the smallest, which indicated this material has the best dimensional stability of the product.

在这项工作中，研究了一种新型无规高抗冲聚丙烯基共聚物 PBE 的流变性能，该共聚物具有优异的透明性和抗冲击性。研究包括剪切应力、表观剪切粘度、粘性流动活化能、挤出物溶胀比、熔体强度和熔体挤出形态等。该研究基于使用 RPB 和 RPE 的毛细管流变仪；两者目前都被广泛使用，加工技术成熟，作为控制。根据研究，得出了以下结果。首先，PBE 是一种假塑性流体，用于 RPE 和 RPB 的加工方法完全适用于 PBE。其次，在上述采用的样品中，PBE 表现出最高的“剪切灵敏度”，温度和剪切速率对 PBE 的流变性能影响最大。第三，PBE 的熔体强度明显低于 RPB 和 RPE，但随温度变化很大，这表明注射成型最适合 PBE。最后，研究还发现在给定的剪切速率下，PBE的挤出溶胀比最小，表明该材料具有最好的产品尺寸稳定性。