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聚丙烯/聚乳酸共混物的加速实验室老化

Accelerated Laboratory Weathering of Polypropylene/Poly (Lactic Acid) Blends.

作者信息

Zhou Qihua, Liu Xuan, Lu Yanzhen, Dao Xiaoyao, Qiu Liuqing

机构信息

School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China.

出版信息

Polymers (Basel). 2022 Dec 21;15(1):17. doi: 10.3390/polym15010017.

DOI:10.3390/polym15010017
PMID:36616367
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9823939/
Abstract

To solve the pollution problems that result from polypropylene (PP), suitable biopolymers such as poly (lactic acid) (PLA) were selected to blend with PP. Since PP/PLA blends are often exposed to the natural environment, it is necessary to study the photodegradation behavior of PP/PLA blends. In this paper, PP/PLA blends with different compositions were prepared by extrusion and subjected to the accelerated laboratory weathering equipment. The effects of compatibilizers on the degradation behavior of PP/PLA blends were also studied. The weatherability of PP/PLA blends was studied through weight loss, optical microscope, Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The results revealed that PP is easy to degrade than PLA during accelerated laboratory weathering. PP/PLA blends are susceptible to the accelerated laboratory weathering process, and PP-rich and PLA-rich blends reduce the weathering resistance. Moreover, the results indicate that the initial degradation temperature, melting temperature, and crystallization temperature decrease after weathering related to the decreased thermal stability of PP/PLA blends. For instance, the initial degradation temperature of PP/PLA8.2 reduces from 332.2 °C to 320.2 °C. Moreover, the compatibilized sample is generally more resistant to weathering conditions than the uncompatibilized one due to the higher compatibility of PP and PLA.

摘要

为了解决聚丙烯（PP）造成的污染问题，选择了合适的生物聚合物，如聚乳酸（PLA）与PP共混。由于PP/PLA共混物经常暴露于自然环境中，因此有必要研究PP/PLA共混物的光降解行为。本文通过挤出制备了不同组成的PP/PLA共混物，并将其置于加速实验室老化设备中。还研究了增容剂对PP/PLA共混物降解行为的影响。通过失重、光学显微镜、傅里叶变换红外光谱（FTIR）、热重分析（TGA）和差示扫描量热法（DSC）研究了PP/PLA共混物的耐候性。结果表明，在加速实验室老化过程中，PP比PLA更容易降解。PP/PLA共混物易受加速实验室老化过程的影响，富含PP和富含PLA的共混物会降低耐候性。此外，结果表明，老化后初始降解温度、熔点和结晶温度降低，这与PP/PLA共混物热稳定性降低有关。例如，PP/PLA8.2的初始降解温度从332.2℃降至320.2℃。此外，由于PP和PLA具有更高的相容性，增容后的样品通常比未增容的样品更耐候。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a78d/9823939/79aad352576d/polymers-15-00017-g015.jpg
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