【摘要】 采用反应挤出方法制备了聚乳酸(PLA)与马来酸酐(MAH)的接枝共聚物,研究了工艺条件和配方对产物接枝率和熔体流动速率的影响。结果表明,聚乳酸的接枝反应主要依赖于大分子侧链自由基进行,过高的螺杆转速或过高的挤出反应温度会引发聚乳酸的降解反应,不利于产物接枝率的提高;在适宜的反应条件下(马来酸酐含量2%,DCP含量0.35%,温度180℃,螺杆转速100 r/min),可以方便制得马来酸酐接枝聚乳酸产物(接枝率≥0.45%);SEM观察显示,马来酸酐接枝聚乳酸有效改善了PLA/淀粉共混材料的相容性。更多还原

【Abstract】 Functionalization of polylactide(PLA) has been performed by means of melt grafting reaction of maleic anhydride(MAH) initiated by dicumyl peroxide(DCP) in a corotating intermeshing twin-screw extruder.The effects of the processing condition and the composition of reaction mixture on the properties of polylactide grafted maleic anhydride product(PLA-g-MAH) were investigated.The results show that the excessive screw rotation speed or a higher reaction temperature can lead to the degradation of PLA or the decreasing of the percentage of grafting.The desired graft content(Percentage of grafting ≥0.45%) with minimal degradation can be obtained by controlling these factors(MAH content=2%,DCP content=0.35%,reactive temperature=180 ℃,screw rotation speed=100 r/min).SEM proves that PLA-g-MAH improves the compatibility between PLA and starch effectively.更多还原