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Impact-Resistant PLLA/PBAT Composites Based on Novel Biobased Reactive Microcross-Linked PBAT
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2025-01-08 , DOI: 10.1021/acs.iecr.4c04307
Yichen Xu, Xin Meng, Xinze You, Wang Jiang, Pu Du, Longjie Jiao, Chenyang Li, Bo Bao, Zhong Xin

Due to the differences in molecular structure, Poly(L-lactide) (PLLA) and Poly(butylene adipate-co-terephthalate) (PBAT) are inherently immiscible in the melt processing, resulting in limited mechanical properties of the PLLA/PBAT blends. Herein, a novel biobased microcross-linked PBAT has been prepared through dynamic vulcanization in the presence of dicumyl peroxide (DCP) and cardanol glycidyl ether (CGE). The rheological behavior showed that the modified PBAT exhibited high complex viscosity and storage modulus in comparison to virgin PBAT due to the formation of a cross-linking structure. When the contents of DCP and CGE were, respectively, 1.0 and 2.0 wt % compared to PBAT, the cross-linking degree of the modified PBAT named B/1.0D/2.0C reached the maximum of 37.1%. At the aid of this modified PBAT, the notched impact strength and elongation at break of the blend of PLLA and the modified PBAT reached 10.0 kJ/m2 and 265.4%, respectively, about 2.0 and 1.8 times that of pristine L/B blends. The toughening effect was attributed to the enhanced melt viscosity of the microcross-linked PBAT and the improved interfacial interaction between PLLA and PBAT. The molecular dynamic simulation results further confirmed that the microcross-linked PBAT had better miscibility and toughening effect for PLLA compared to virgin PBAT. Thus, this work paved a new way for the preparation of fully biodegradable impact-resistant PLLA-based composites.

中文翻译:


基于新型生物基反应性微交联 PBAT 的抗冲击 PLLA/PBAT 复合材料



由于分子结构的差异,聚(L-丙交酯) (PLLA) 和聚己二酸丁二醇酯-对苯二甲酸丁二醇酯 (PBAT) 在熔融加工中本质上是不混溶的,导致 PLLA/PBAT 共混物的机械性能有限。在此,在过氧化二异丙苯 (DCP) 和腰果酚缩水甘油醚 (CGE) 存在下通过动态硫化制备了一种新型生物基微交联 PBAT。流变行为表明,由于形成了交联结构,与原生 PBAT 相比,改性 PBAT 表现出较高的复数粘度和储能模量。当 DCP 和 CGE 含量分别为 1.0 wt % 和 2.0 wt % 时,改性 PBAT 的交联度为 B/1.0D/2.0C,达到最大值 37.1%。在这种改性PBAT的帮助下,PLLA和改性PBAT共混物的缺口冲击强度和断裂伸长率分别达到10.0 kJ/m2和265.4%,约为原始L/B共混物的2.0倍和1.8倍。增韧效果归因于微交联 PBAT 的熔融粘度增强以及 PLLA 和 PBAT 之间界面相互作用的改善。分子动力学模拟结果进一步证实,与原生 PBAT 相比,微交联 PBAT 对 PLLA 具有更好的混溶性和增韧效果。因此,这项工作为制备完全可生物降解的抗冲击 PLLA 基复合材料铺平了一条新路。
更新日期:2025-01-09
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