稀土成核剂对聚乳酸结晶行为和热性能的影响

EFFECT OF RARE EARTH NUCLEATING AGENT ON THE CRYSTALLIZATION BEHAVIOR AND THERMAL PROPERTY OF POLYLACTIDE

实验以原位聚合法制备了稀土成核剂/聚乳酸(PLA)复合材料。经光学解偏振法、X射线衍射、温度-形变曲线及热失重表征了复合材料的结晶行为和热性能。实验结果表明,稀土成核剂/PLA复合材料相比纯PLA,结晶速率和结晶度大幅度提高,当稀土成核剂质量分数为2%时,结晶速率为纯PLA的2.15倍,结晶度为53.74%,玻璃化温度为123.3℃。适量的稀土成核剂能显著提高复合材料的结晶速率、结晶度及热稳定性。

Rare earth nucleating agent/polylactide（PLA） composites were prepared by in situ polymerization. Optical depolarization, X-ray diffraction, temperature-deformation curve, and thermal gravimetric analysis were employed to characterize the crystallization behavior and thermal property of the obtained composites. The results showed that, compared with the pure PLA, the crystallization rate and crystallinity of the composites increased greatly. When the content of the rare earth nucleating agent reached 2%, the crystallization rate of the composite was improved by 2. 15 times of that of PLA, the crystallinity of the composite was up to 53. 74%, the glass transition temperature of the composite reached 123.3 ℃. When the rare earth nucleating agent had an appropriate amount, the crystallization rate, crystallinity and thermal stability of the composites were markedly improved.