聚乳酸和淀粉共混的支化聚酯聚氨酯在土壤中的降解敏感性

Susceptibility to Degradation in Soil of Branched Polyesterurethane Blends with Polylactide and Starch.

作者信息

Brzeska Joanna, Jasik Grzegorz, Sikorska Wanda, Mendrek Barbara, Karczewski Jakub, Kowalczuk Marek, Rutkowska Maria

机构信息

Department of Industrial Product Quality and Chemistry, Gdynia Maritime University, 83 Morska Street, 81-225 Gdynia, Poland.

Non-Food and Packaging Laboratory, J.S. Hamilton Poland Sp. z o.o., Chwaszczynska Street 180, 81-571 Gdynia, Poland.

出版信息

Polymers (Basel). 2022 May 20;14(10):2086. doi: 10.3390/polym14102086.

DOI:10.3390/polym14102086

PMID:35631968

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9144702/

Abstract

A very important method of reducing the amount of polymer waste in the environment is the introduction to the market of polymers susceptible to degradation under the influence of environmental factors. This paper presents the results of testing the susceptibility to degradation in soil of branched polyesterurethane (PUR) based on poly([R,S]-3-hydroxybutyrate) (R,S-PHB), modified with poly([D,L]-lactide) (PLA) and starch (St). Weight losses of samples and changes in surface morphology (SEM, OM and contact angle system) with simultaneously only slight changes in molecular weight (GPC), chemical structure (FTIR and HNMR) and thermal properties (DSC) indicate that these materials are subject to enzymatic degradation caused by the presence of microorganisms in the soil. Chemical modification of branched polyesterurethanes with R,S-PHB and their physical blending with small amounts of PLA and St resulted in a slow but progressive degradation of the samples.

摘要

减少环境中聚合物废弃物数量的一种非常重要的方法是将易受环境因素影响而降解的聚合物推向市场。本文介绍了基于聚（[R,S]-3-羟基丁酸酯）（R,S-PHB）、用聚（[D,L]-丙交酯）（PLA）和淀粉（St）改性的支化聚酯聚氨酯（PUR）在土壤中降解敏感性的测试结果。样品的重量损失以及表面形态的变化（扫描电子显微镜、光学显微镜和接触角系统），同时分子量（凝胶渗透色谱法）、化学结构（傅里叶变换红外光谱和核磁共振氢谱）和热性能（差示扫描量热法）仅有轻微变化，表明这些材料会因土壤中微生物的存在而发生酶促降解。用R,S-PHB对支化聚酯聚氨酯进行化学改性以及它们与少量PLA和St进行物理共混，导致样品缓慢但持续地降解。