A solvent-free process to design low density polyhydroxyalkanoate

Q2 Materials Science Polymers from Renewable Resources Pub Date : 2023-03-22 DOI:10.1177/20412479231165454

Eva De Carvalho, M. Chebil, F. Fay, E. Renard, V. Langlois

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引用次数: 1

Abstract

The polyhydroxyalkanoates (PHAs) are biobased, biocompatible and biodegradable polyesters. To enhance their biodegradability and flexibility, we develop low density PHAs by an emulsion-templated method without organic solvent. Polycaprolactone (PCL) and castor oil are required to improve the flexibility and to generate the porosity, respectively. To overcome the well-known lack of compatibility between PHA and PCL, pluronic is introduced to improve the miscibility of these polyesters The densities of native PHA and PCL are 1.2 g.cm−3 and the densities decreased to 0.49 g.cm−3 in presence of castor oil (40 wt%). Different PHAs were studied: polyhydroxybutyrate (PHB), polyhydroxybutyrate-co-hydroxyvalerate (PHBHV) and polyhydroxybutyrate-co-hydroxyhexanoate (PHBHHx). The porous PHBHHx based material showed the best colonization by Pseudomonas, followed by the PHBHV and PHB. This colonization only occurred in the surface and no bacterial diffusion was observed inside the material. The biodegradability study in presence of lipase showed that after 8 days, the weight losses are, respectively, 20% and 75% when the densities decreased from 0.82 g.cm−3 to 0.49 g.cm−3. These results showed the importance of the porosity on the biodegradation of PHAs. Graphical Abstract

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无溶剂工艺设计低密度聚羟基烷酸酯

聚羟基烷酸酯（PHA）是一种生物基、生物相容性和可生物降解的聚酯。为了提高它们的生物降解性和灵活性，我们在没有有机溶剂的情况下通过乳液模板法开发了低密度PHA。聚己内酯（PCL）和蓖麻油分别需要提高柔韧性和产生孔隙率。为了克服众所周知的PHA和PCL之间缺乏兼容性的问题，引入pluronic来改善这些聚酯的混溶性。天然PHA和PCL的密度为1.2 g.cm−3，在蓖麻油（40wt%）的存在下，密度降至0.49 g.cm−3。研究了不同的PHA：聚羟基丁酸（PHB）、聚羟基丁酸-共羟基戊酸（PHBHV）和聚羟基丁酸酯-共羟基己酸（PHBHHx）。基于PHBHHx的多孔材料显示出假单胞菌的最佳定殖，其次是PHBHV和PHB。这种定植只发生在表面，在材料内部没有观察到细菌扩散。脂肪酶存在下的生物降解性研究表明，8天后，当密度从0.82 g.cm−3降至0.49 g.cm−时，重量损失分别为20%和75%。这些结果表明了孔隙率对PHA生物降解的重要性。图形摘要

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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.