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中文摘要：
研究了聚丙烯熔体挤出螺纹畸变产生的机理，采用原位成纤复合法制备无规共聚聚丙烯（PP—R）／聚对苯二甲酸乙二醇酯（PET）复合材料来改善PP—R的挤出性能。结果表明：口模入口区的环向次级流动是PP—R熔体产生螺纹畸变的主要原因；采用“挤出-热拉伸-淬冷”工艺制得的复合样品中PET以微纤状分散于PP—R基体中，有效地推迟了PP—R熔体挤出螺纹畸变的发生。
英文摘要：
The mechanisms of the helix distortions occurred during PP-R melts extrusion were studied. The PP-R/PET composites made by in-situ fibrillation were used to improve the performance of PP-R extrudates. The results show that the helix distortions of PP-R extrudates are resulted from the annular secondary flow at the entrance of die. In the composites made by extrusion-tretching-quenching technique, the PET microfiber is dispersed in the PP-R matrixes. The occurrence of the helix distortions of PP-R extrudates is effectively detained.
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