Degradation Dynamics and Mechanical–Thermal Response of Polylactide/Poly(Propylene Carbonate) Blends: Towards Sustainable Material Design

IF 4.7 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL Journal of Polymers and the Environment Pub Date : 2024-05-28 DOI:10.1007/s10924-024-03319-0

Yujin Kwon, Vishal Gavande, Donghyeok Im, Won-Ki Lee

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Abstract

Blending polylactide (PLA) with poly(propylene carbonate) offers potential solution to mitigate the greenhouse effect due to PLA’s lower carbon dioxide (CO₂) emissions and its use of CO₂ as a monomer in PPC synthesis. In this investigation, a series of PLA and PPC blends were prepared using the solvent casting method to address their respective weaknesses. The blends exhibited partial compatibility, as evidenced by a noticeable shift in the glass transition temperatures toward each other. Tensile testing revealed that the incorporation of PPC improved the elongation properties of PLA. The degradation characteristics of the blend films were evaluated based on changes in the monolayer’s occupied area, the properties of the bulk film, and changes in surface morphology. Results indicated that PPC content accelerated hydrolytic degradation but slowed enzymatic degradation in the blends. Hydrolytic and enzymatic degradation significantly impacted the mechanical properties of PLA/PPC blends, prolonging the degradation process through chain scission.

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聚乳酸/聚（碳酸丙烯酯）混合物的降解动力学和机械热响应：实现可持续材料设计

由于聚乳酸（PLA）的二氧化碳（CO2）排放量较低，而且在聚丙烯酸酯（PPC）合成过程中使用二氧化碳作为单体，因此聚乳酸（PLA）与聚丙烯酸酯（PPC）的混合物为缓解温室效应提供了潜在的解决方案。在这项研究中，针对聚乳酸和聚苯乙烯各自的弱点，采用溶剂浇铸法制备了一系列聚乳酸和聚苯乙烯混合物。这些混合物表现出部分相容性，玻璃化转变温度的明显相互移动就是证明。拉伸测试表明，PPC 的加入改善了聚乳酸的伸长特性。根据单层占据面积的变化、大块薄膜的特性以及表面形态的变化，对混合薄膜的降解特性进行了评估。结果表明，聚对苯二甲酸含量加速了共混物的水解降解，但减缓了酶降解。水解降解和酶降解显著影响了聚乳酸/聚丙烯酸共混物的机械性能，通过链裂延长了降解过程。

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.