Xue Guilian, Sun Bohua, Han Lu, Liu Baichuan, Liang Hongyu, Pu Yongfeng, Tang Hongming, Ma Fangwu
State Key Laboratory of Automotive Simulation and Control, College of Automotive Engineering, Jilin University, Changchun 130022, China.
Changguang Jizhi Optical Technology Co., Ltd., Changchun 130022, China.
Polymers (Basel). 2022 Jul 4;14(13):2734. doi: 10.3390/polym14132734.
Poly(lactic acid) (PLA) is an emerging plastic that has insufficient properties (e.g., it is too brittle) for widespread commercial use. Previous research results have shown that the strength and toughness of basalt fiber reinforced PLA composites (PLA/BF) still need to be improved. To address this limitation, this study aimed to obtain an effective compatibilizer for PLA/BF. Melt-blending of poly(butylene adipate-co-terephthalate) (PBAT) with PLA in the presence of 4,4'-methylene diphenyl diisocyanate (MDI: 0.5 wt% of the total resin) afforded PLA/PBAT-MDI triblock copolymers. The triblock copolymers were melt-blended to improve the interfacial adhesion of PLA/BF and thus obtain excellent performance of the PLA-ternary polymers. This work presents the first investigation on the effects of PLA/PBAT-MDI triblock copolymers as compatibilizers for PLA/BF blends. The resultant mechanics, the morphology, interface, crystallinity, and thermal stability of the PLA-bio polymers were comprehensively examined via standard characterization techniques. The crystallinity of the PLA-ternary polymers was as high as 43.6%, 1.44× that of PLA/BF, and 163.5% higher than that of pure PLA. The stored energy of the PLA-ternary polymers reached 20,306.2 MPa, 5.5× than that of PLA/BF, and 18.6× of pure PLA. Moreover, the fatigue life of the PLA-ternary polymers was substantially improved, 5.85× than that of PLA/PBAT-MDI triblock copolymers. Thus, the PLA/PBAT-MDI triblock copolymers are compatibilizers that improve the mechanical properties of PLA/BF.
聚乳酸（PLA）是一种新兴塑料，其性能（如太脆）不足以广泛用于商业用途。先前的研究结果表明，玄武岩纤维增强PLA复合材料（PLA/BF）的强度和韧性仍需提高。为解决这一局限性，本研究旨在为PLA/BF获得一种有效的增容剂。在4,4'-亚甲基二苯基二异氰酸酯（MDI：占总树脂的0.5 wt%）存在下，将聚（己二酸丁二醇酯-co-对苯二甲酸丁二醇酯）（PBAT）与PLA熔融共混，得到PLA/PBAT-MDI三嵌段共聚物。将三嵌段共聚物熔融共混以改善PLA/BF的界面粘附力，从而获得PLA三元聚合物的优异性能。本文首次研究了PLA/PBAT-MDI三嵌段共聚物作为PLA/BF共混物增容剂的效果。通过标准表征技术全面研究了PLA生物聚合物的力学性能、形态、界面、结晶度和热稳定性。PLA三元聚合物的结晶度高达43.6%，是PLA/BF的1.44倍，比纯PLA高163.5%。PLA三元聚合物的储能达到20306.2 MPa，是PLA/BF的5.5倍，是纯PLA的18.6倍。此外，PLA三元聚合物的疲劳寿命大幅提高，是PLA/PBAT-MDI三嵌段共聚物的5.85倍。因此，PLA/PBAT-MDI三嵌段共聚物是能够改善PLA/BF力学性能的增容剂。
