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。
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.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2009年第3期85-88,共4页
Polymer Materials Science & Engineering
关键词
聚乳酸
马来酸酐
反应挤出
接枝
PLA
maleic anhydride
reactive extrusion
melt grafting
