【摘要】 采用自制的生物基聚酯弹性体P(BF-PBAD)成功制备了一种新型超韧聚乳酸/甲基丙烯酸缩水甘油酯改性聚烯烃弹性体/生物基聚酯弹性体(PLA/m-POE/P(BF-PBAD))复合材料，并对其性能及增韧机制进行了研究。当P(BF-PBAD)含量仅为3份时，复合材料的冲击强度达到42 kJ/m~2,相比纯PLA提高了14倍，呈现出良好的增韧效果。此外，复合材料还具有优异的机械性能，拉伸强度、断裂伸长率、弯曲强度及弯曲模量分别达到40 MPa、120%、50 MPa和1800 MPa。与纯PLA相比，该复合材料表现出好的热稳定性，玻璃化转变温度和熔融温度均得到提升。P(BF-PBAD)的引入使得复合材料在二次升温过程中的冷结晶行为增强。基于对复合材料相形貌、动态力学等结果的分析，发现PLA/m-POE/P(BF-PBAD)复合材料的增韧主要缘于聚合物界面相容性的提高。更多还原

【Abstract】 A novel ultra-tough poly(lactic acid)/glycidyl methacrylate-modified polyolefin elastomer/bio-based polyester elastomer(PLA/m-POE/P(BF-PBAD)) composite was successfully prepared using a self-prepared bio-based polyester elastomer P(BF-PBAD) as compatibilizer, and its properties and toughening mechanism were investigated. With only 3 phr loading of P(BF-PBAD), the impact strength of the composite reaches a remarkable value of 42 k J/m~2, which is about 1400% enhancement compared with pure PLA. Furthermore, the composites exhibit excellent mechanical properties, and their tensile strength, elongation at break, flexural strength and flexural modulus are about 40 MPa, 120%, 50 MPa and 1800 MPa, respectively. Meanwhile, the PLA composites exhibit thermal stability with improved glass transition and higher melting temperatures compared with pure PLA. The cold crystalline behavior of PLA composites during the second heating process was improved by the introduction of P(BF-PBAD). The results indicate that the ultra-toughness of PLA/m-POE/P(BF-PBAD) composites mainly originate from the enhancement of interfacial compatibility.更多还原