本研究將聚乳酸（PLA）和回收聚丙烯（RPP）通過雙螺桿混鍊機熔融處理的方式製造成共混物，利用TGA、DSC、FESEM，進行熱性質與型態學上的觀察，最後利用物理性質的測試對材料做紡絲與否的探討。結果顯示PLA / RPP共混物是一種不互溶的兩相結構。熱性質結果表示此共混物的熱穩定性會隨著RPP的加入而有所提升；物理測試的研究也顯示，隨著RPP含量的上升會降低的拉伸強度和模量，但是相對的也提高共混物的衝擊強度。AHAMTES是一種有效的界面改質劑或粘合促進劑，我們透過在PLA/RPP共混物加入少量AHAMTES去改善其界面性質。從FESEM結果可觀察到AHAMTES的有無，對PLA與RPP的介面是有明顯變化，可證明AHAMTES對此共混物的內部是具有交互作用力的。此外，在AHAMTES存在下也相對地提高了共混物的機械性能，且共混物的拉伸強度在AHAMTES（相對於改值共混物的含量）為1.5重量％的最大達到，而衝擊強度也隨著AHAMTES濃度增加而有所提升，確認AHAMTES的加入對PLA / RPP的共混物是具有良好的影響，但實際上機測試結果顯示還是無法達到紡絲標準。所以選用sheath and core型態的紡絲方式進行紡絲測試，但是，RPP為射出級的PP其MI值太低，無法成功的進行抽絲，所以在RPP中加入工業級PP去改善其MI，最終，成功的將兩種不互熔高分子完成纖維的製備，且物理性質的測試結果證明，在core部分PP/RPP共混物比例為90/10時效益最佳。

We use twin screw to prepare the blends of poly lactic acid (PLA)/recycle polypropylene(RPP) blends, and study its thermal property and morphology by TGA, DSC, FESEM. Then test the physical property of blends to check can be fiber or not. From the FESEM, we can observe that PLA/RPP blends are an immiscible two phase structure. Thermal and physical properties also show that the thermal stability and mechanical properties increase when the content of RPP enhance. AHAMTES is an efficient coupling agents, or surface modifiers. We try to improve the surface of PLA/RPP by adding AHAMTS. Observation of the FESEM show that AHAMTES is working on the surface of the blends. And we found that 1.5%wt is the most effective content of AHAMTES for PLA/RPP blends by tensile test, also confirm the impact strength increase as the amount of AHAMTES enhance. But finally melt spinning test for blends show that it still can not be fiber. Therefore we change the fiber way with the sheath and core type, but the RPP is injection grade, the MI value is too low for fiber, so we use the addition of industrial PP for improvement of RPP, finally we successfully prepare the fiber by using two immiscible polymers. The sheath-core structure is comfirmed by FESEM and the physical test show the most effective ratio of the core of PP/RPP blends is 90/10.

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