Mysiukiewicz Olga, Barczewski Mateusz, Skórczewska Katarzyna, Szulc Joanna, Kloziński Arkadiusz
Institute of Material Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, Poland.
Faculty of Technology and Chemical Engineering, University of Technology and Life Science, Seminaryjna 3, 85-326 Bydgoszcz, Poland.
Polymers (Basel). 2019 Sep 12;11(9):1495. doi: 10.3390/polym11091495.
This paper presents the effects of accelerated weathering on the properties of polylactide (PLA) composites filled with linseed cake. The particle-shaped waste filler with different linseed oil content (0.9-39.8 wt %) was incorporated with constant amount of 10 wt % to a polymeric matrix and subjected to accelerated weathering tests with different exposition times. The structure of the composites, their mechanical, thermal, and thermo-mechanical properties were evaluated by means of scanning electron microscopy, tensile test, dynamic mechanical thermal analysis, and differential scanning calorimetry prior to and after weathering. The results of the measurements were analyzed in reference to the amount of crude oil contained in the filler. The behavior of the multiphase composite during weathering was described. It was found that the oil-rich samples during the first stage of the process showed increased resistance to hydrolytic degradation due to their relatively high crystallinity. The presence of water and elevated temperatures caused swelling of the filler and cracking of the polymeric matrix. Those discontinuities enabled the plasticizing oil to be rinsed out of the composite and thus water penetrated into the samples. As a result, the PLA-based composites containing oil-rich linseed cake were found to be more vulnerable to hydrolytic degradation in a longer time.
本文介绍了加速老化对填充亚麻籽饼的聚乳酸（PLA）复合材料性能的影响。将具有不同亚麻籽油含量（0.9 - 39.8 wt%）的颗粒状废弃填料以10 wt%的恒定含量加入到聚合物基体中，并进行不同暴露时间的加速老化试验。在老化前后，通过扫描电子显微镜、拉伸试验、动态热机械分析和差示扫描量热法对复合材料的结构、力学、热学和热机械性能进行了评估。根据填料中所含原油的量对测量结果进行了分析。描述了多相复合材料在老化过程中的行为。结果发现，在该过程的第一阶段，富含油的样品由于其相对较高的结晶度而表现出对水解降解的抗性增加。水和升高的温度导致填料膨胀和聚合物基体开裂。这些不连续性使得增塑油从复合材料中被冲洗出来，从而水渗透到样品中。结果发现，含有富含油的亚麻籽饼的PLA基复合材料在较长时间内更容易受到水解降解的影响。
