In this work new biodegradable composite materials based on poly(butylene-adipate-co-terephthalate) (PBAT) reinforced with water-soluble calcium-phosphate glass (CPG) microparticles at different filler concentration (0, 4, 10, 20 and 40 wt%) were characterized by dynamic-mechanical analysis (DMA), aging and fragmentation tests. DMA results showed increasing storage modulus (E′) values with the filler content, without a significant modification of the glass transition temperature (T_g), translating in a reinforcing effect of the filler particles with good interphase adhesion. The creep compliance decreased with the increase of the CPG content, confirming a greater resistance of the composites to deformation under constant stress. The stability to weathering agents and the degree of fragmentation in laboratory-scale composting conditions were also tested, obtaining a higher sensitivity to degradation of the PBAT-based composites with the increase of CPG content. Overall, the addition of CPG particles in a PBAT matrix produced stiffer composites, with modulation of the properties based on the filler content, enhancing at the same time their degradation rate, making them a promising and more sustainable alternative to traditional polymers.

Graphical Abstract

中文翻译：

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聚（己二酸-共对苯二甲酸丁二醇酯）-磷酸钙玻璃复合材料的粘弹性表征和降解稳定性研究

在这项工作中，基于聚（己二酸-共对苯二甲酸丁二醇酯）（PBAT）的新型可生物降解复合材料用不同填料浓度（0、4、10、20 和 40 wt 的水溶性磷酸钙玻璃（CPG）微粒增强） %) 通过动态机械分析 (DMA)、老化和碎片测试来表征。DMA 结果显示储能模量 ( E ') 值随填料含量的增加而增加，而玻璃化转变温度 (Tg) 没有显着_变化)，转化为具有良好相间粘附性的填料颗粒的增强效果。蠕变柔量随着 CPG 含量的增加而降低，证实了复合材料在恒定应力下的抗变形能力更强。还测试了耐候剂的稳定性和实验室规模堆肥条件下的破碎程度，随着 CPG 含量的增加，PBAT 基复合材料对降解的敏感性更高。总体而言，在 PBAT 基体中添加 CPG 颗粒会产生更硬的复合材料，并根据填料含量调节性能，同时提高其降解率，使其成为传统聚合物的有前途且更可持续的替代品。

图形概要