School of Chemistry & Chemical Engineering, Yangzhou University, Jiangsu, Yangzhou, 225002, PR China.
School of Chemistry & Chemical Engineering, Yangzhou University, Jiangsu, Yangzhou, 225002, PR China; Institution of Innovative Materials & Energy, Yangzhou, Jiangsu Province, 225002, PR China.
Carbohydr Polym. 2020 Apr 1;233:115845. doi: 10.1016/j.carbpol.2020.115845. Epub 2020 Jan 8.
Blending two biodegradable aliphatic polyesters with complementary bulk properties is an easy way of tuning their final properties. In this work, the ductile poly(butylene succinate) was mixed with polylactide, and as expectable, the blends show improved toughness with sharply reduced strengths. The pristine cellulose nanofibers were then used as the reinforcement for the blends. It is found that most nanofibers are dispersed in the polylactide phase because polylactide has better affinity to nanofibers, and the lower viscosity level of polylactide also favors driving nanofibers into the continuous polylactide phase during melting mixing. In this case, the strength and rigidity losses resulted from the presence of soft poly(butylene succinate) phase are compensated to some extent. To further improve mechanical properties, a two-step approach (reactive processing of blends, followed by the incorporation with nanofibers) was developed. This work provides an interesting way of fabricating fully biodegradable composites with well-balanced mechanical performance.
将两种具有互补体积性能的可生物降解脂肪族聚酯混合是调节其最终性能的一种简单方法。在这项工作中，韧性的聚丁二酸丁二醇酯与聚乳酸混合，正如预期的那样，共混物表现出了显著提高的韧性，同时强度大幅降低。然后，将原始的纤维素纳米纤维用作共混物的增强材料。结果发现，由于聚乳酸对纳米纤维具有更好的亲和力，并且聚乳酸的较低粘度水平也有利于在熔融混合过程中将纳米纤维驱动到连续的聚乳酸相中，因此大多数纳米纤维分散在聚乳酸相中。在这种情况下，由于存在软的聚丁二酸丁二醇酯相，导致强度和刚性损失在一定程度上得到了补偿。为了进一步提高力学性能，开发了一种两步法（共混物的反应性加工，然后与纳米纤维结合）。这项工作为制造具有良好力学性能的完全可生物降解复合材料提供了一种有趣的方法。
