【摘要】 通过热重分析(TGA)、差示扫描量热分析(DSC)以及熔体流动速率(MFR)和拉伸性能测试,研究了复合抗氧剂(抗氧剂B/抗氧剂C)、多元醇(聚乙二醇、季戊四醇、D-山梨醇)及其并用对聚乳酸(PLA)再生料热稳定性、结晶行为、加工性能和拉伸性能的影响。结果表明:复合抗氧剂具有良好的热稳定效果,并且使PLA再生料的MFR值明显减小,拉伸强度增大,其中当抗氧剂B和抗氧剂C的配比为2:1时,稳定效果最佳;多元醇的引入亦改善了PLA再生料的热稳定性;多元醇及并用稳定剂(多元醇/抗氧剂)对PLA的结晶行为几乎没有影响;多元醇和抗氧剂之间具有良好的协同效应,当D-山梨醇与复合抗氧剂并用时,可使材料的热分解温度和拉伸强度明显提升,并且热降解实验后材料的MFR仍然保持在较低水平。更多还原

【Abstract】 Compound antioxidant(antioxidant B/antioxidant C), polyols(polyethylene glycol, pentaerythritol, D-sorbitol) and their complex were respectively added into polylacticacid(PLA) reclaimed material as thermal stabilizer, and the effects of the stabilizers on thermal stability, crystallization behavior, processability and tensile properties of the modified PLA were studied through different scanning calorimeter(DSC), melt flow rate(MFR) and tensile property tests separately. The results show that: the compound antioxidants can improve the thermal stability of PLA reclaimed material effectively, MFR of PLA decreases and tensile strength increases with the addition of antioxidant B/antioxidant C, moreover, the material has the optimal thermalstability while the ratio of antioxidant B to antioxidant C is 1:2; the introduction of polyols also improves the thermal stability of PLA reworked material; polyols and compound stabilizer(polyol/antioxidant) have little effect on crystallization behavior of PLA; antioxidants have favorable synergistic effects with polyols, the complex of D-sorbitol and compound antioxidant can improve the thermal decomposition temperature and tensile strength of PLA obviously, and MFR of the material after thermal degradation test remains at a lower level.更多还原