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.

中文翻译：

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纤维素纳米纤维增强的可生物降解聚酯共混物：具有平衡机械性能的三元生物复合材料。

将两种可生物降解的脂族聚酯与具有互补的本体特性进行混合是调节其最终特性的简便方法。在这项工作中，将可延展的聚丁二酸丁二酯与聚丙交酯混合，并且可以预期，该共混物显示出改善的韧性，而强度却急剧降低。然后将原始纤维素纳米纤维用作共混物的增强剂。发现大多数纳米纤维分散在聚丙交酯相中，因为聚丙交酯对纳米纤维具有更好的亲和力，并且较低的聚丙交酯粘度水平也有利于在熔融混合期间将纳米纤维驱动到连续的聚丙交酯相中。在这种情况下，由于存在软聚丁二酸丁二酯相而导致的强度和刚度损失得到了一定程度的补偿。为了进一步改善机械性能，开发了一种两步法（对共混物进行反应处理，然后与纳米纤维结合）。这项工作提供了一种有趣的方式来制造具有良好平衡的机械性能的可完全生物降解的复合材料。