The aim of this work is to evaluate the influence of nanosized CaCO₃ on the photo‐oxidation of poly(butylene adipate‐co‐terephthalate) (PBAT)‐based nanocomposites. The PBAT/CaCO₃ nanocomposites are prepared by using a corotating twin‐screw extruder with 0, 2, and 5 wt% of CaCO₃. The films are obtained by film blowing process. Specimens of the nanocomposites and that of the pure polymer are subjected to accelerated aging with a cycle of 8 h of light at a temperature of 55 °C followed by 4 h condensation at 45 °C to evaluate the effects of the CaCO₃ addition on the photo‐oxidation of PBAT. The results indicate that the modulus and tensile strength of the nanocomposites are increased significantly after incorporation of nanosized CaCO₃, but, however, the elongation at break remains almost unchanged. The presence of the calcium carbonate slightly increases the photo‐oxidation rate of the matrix due to the presence of a stearate coating.

中文翻译：

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碳酸钙对聚己二酸丁二醇酯-对苯二甲酸对苯二甲酸酯的光氧化行为的影响

这项工作的目的是评估纳米碳酸钙的影响₃上的聚（亚丁基己二酸酯的光氧化共-terephthalate）（PBAT）系纳米复合材料。PBAT / CaCO ₃纳米复合材料是通过使用具有0、2和5 wt％的CaCO _3的同向双螺杆挤出机制备的。所述膜通过吹膜工艺获得。纳米复合材料的样品和纯聚合物的样品在55°C的温度下经过8 h的光循环加速老化，然后在45°C下冷凝4 h以评估CaCO _3的作用另外对PBAT的光氧化作用。结果表明，纳米复合CaCO ₃掺入后，纳米复合材料的模量和拉伸强度显着提高，但是，断裂伸长率几乎保持不变。由于存在硬脂酸盐涂层，碳酸钙的存在会稍微增加基质的光氧化速率。