Exploring the performance of bio-based PLA/PHB blends: A comprehensive analysis

Q2 Materials Science

Polymers from Renewable Resources Pub Date : 2024-07-23 DOI:10.1177/20412479241266954

Luyao Gao, Aleksey D. Drozdov

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Abstract

Poly(lactic acid) (PLA) is a bio-based linear aliphatic polyester that is broadly used in biomedical applications. A shortcoming of PLA is its brittleness and low toughness. Poly(hydroxybutyrate) (PHB) is a microbial bioprocessed and biodegradable polyester. To enhance toughness of PLA, it was melt-blended with PHB-based thermoplastic elastomer in various proportions by using a twin-screw extruder. Scanning electron microscope images reveal that PLA forms a continuous phase in PLA/PHB blends reinforced with inclusions of PHB. Fourier transform infrared spectroscopy measurements demonstrate strong intermolecular interactions between PLA and PHB chains. Differential scanning calorimeter thermogramms show that PHB reduces the glass transition temperature of PLA and affects its crystalline structure. When the mass fraction of PHB was 20, the glass transition temperature of the blend decreased to 33.9°C. Rheological measurements demonstrate that blending of PLA with PHB changes qualitatively the dependence of its viscosity on shear rate. Quasi-static (uniaxial tension) and dynamic (impact) tests confirm that blending of PLA with PHB results in a noticeable (by a factor of three) increase in its impact toughness and causes transition from the brittle to ductile regime of fracture. When the mass fraction of PHB was 40, the impact toughness reached to 0.40 kJ/m2, almost 3 times to neat PLA.

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探索生物基聚乳酸/聚对苯二甲酸乙二醇酯混合物的性能：综合分析

聚乳酸（PLA）是一种生物基线性脂肪族聚酯，广泛应用于生物医学领域。聚乳酸的缺点是脆性和韧性低。聚羟丁酸（PHB）是一种经微生物生物加工的可生物降解聚酯。为了提高聚乳酸的韧性，使用双螺杆挤出机将聚乳酸与 PHB 基热塑性弹性体按不同比例熔融共混。扫描电子显微镜图像显示，聚乳酸在聚乳酸/PHB 混合物中形成连续相，并由 PHB 的夹杂物增强。傅立叶变换红外光谱测量表明聚乳酸和 PHB 链之间存在强烈的分子间相互作用。差示扫描量热仪热图显示，PHB 降低了聚乳酸的玻璃化转变温度，并影响了其结晶结构。当 PHB 的质量分数为 20 时，混合物的玻璃化温度降至 33.9°C。流变学测量结果表明，聚乳酸与 PHB 混合后，其粘度与剪切速率的关系发生了质的变化。准静态（单轴拉伸）和动态（冲击）试验证实，聚乳酸与 PHB 混合后，其冲击韧性明显提高（提高了三倍），并从脆性断裂转变为韧性断裂。当 PHB 的质量分数为 40 时，冲击韧性达到 0.40 kJ/m2，几乎是纯聚乳酸的 3 倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymers from Renewable Resources Materials Science-Polymers and Plastics

CiteScore

3.50

自引率

0.00%

发文量

期刊介绍： Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.