本實驗係將回收再製的聚丙烯(recycled PP, R-PP)與紡絲級聚丙烯(PP)經雙螺桿混煉機進行熔融混摻改質，並進行TGA、DSC、MI等熱性質和流變性質的探討。本文亦用凝膠層析滲透儀(GPC)測定R-PP之分子量分布狀態與分散性，並以流變儀測其流變性質。最後將不同比例之R-PP/PP混摻物進行熔融紡絲，並測量其伸度、強度，及丹尼數等纖維物性，並選擇強度較高之R-PP/PP混摻纖維進行織布測試。由熱性質的結果表示R-PP/PP的熱穩定性較差，結晶度與紡絲級PP相近。對於熔融紡絲加工的特性，本實驗藉由毛細管流變儀進行分析，最後選定50~100wt%的R-PP/PP進行熔融紡絲，並以800m/min、1000m/min、1200m/min三種紡絲速度，探討R-PP的含量及紡絲速度對纖維物性的影響。

In this study, recycled polypropylene (R-PP) was blended with fiber spinning grade polypropylene (PP) using a twin-screw extruder. The thermal properties of the resulting blend such as thermogravimetry analysis (TGA), differential scanning calorimeter (DSC), and melt flow index (MI) were determined. The results show that the thermal stability of R-PP was poor and the crystallinity is similar to the fiber spinning grade PP. Rheological properties were also being studied. The molecular weight distribution and dispersion of R-PP were measured using gel permeation chromatography (GPC) and compared with PP. In addition, blends containing 50 ~ 100wt% R-PP were melt spun into fibers at spinning speeds of 800, 1000, and 1200 m/min. The resultant fibers were characterized including elongation, tenacity, and denier of fibers. The R-PP fibers with the highest tenacity were woven into fabrics.

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