Influence of sisal fibre modification on the microbial stability of poly(hydroxybutyrate-co-valerate): thermal analysis

IF 1.1 4区工程技术 Q4 POLYMER SCIENCE

Polimery Pub Date : 2022-04-19 DOI:10.14314/polimery.2022.3.1

T. Kittikorn, E. Strömberg, M. Ek, S. Karlsson

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引用次数: 1

Abstract

The effect of modification of sisal fibre with propionic anhydride and vinyltrimethoxy silane on the microbiological stability of poly(hydroxybutyrate-co-valerate) (PHBV) was investigated. The effect of the coupling agent – PHBV grafted with maleic anhydride (PHBV-g-MA) was also investigated. The best adhesion at the interface was observed for propionylation of sisal fibre, which improved the thermal properties of the composites. Composites with modified sisal fibre were characterized by higher activation energy (155 kJ/mol), which is related to stronger interactions at the matrix-fibre interface. In the microbial growth test, all biocomposites showed a decrease in molecular weight due to enzymatic degradation by Aspergillus niger. The most resistant to microorganisms was the composite containing propionylated sisal fibre. DMTA and TGA also confirmed the highest microbiological stability of the composite with the addition of propionylated sisal fibre, as evidenced by the smallest change in the properties after the microbiological growth test. In contrast, PHBV-g-MA caused significant enzymatic degradation due to the presence of large amorphous regions.

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剑麻纤维改性对聚羟基丁酸酯-戊酸酯微生物稳定性的影响：热分析

研究了丙酸酐和乙烯基三甲氧基硅烷改性剑麻纤维对聚羟基丁酸酯-共戊酸酯(PHBV)微生物稳定性的影响。研究了马来酸酐接枝偶联剂PHBV (PHBV-g- ma)的接枝效果。结果表明，剑麻丙酰化处理后，复合材料的界面黏附效果最好，提高了复合材料的热性能。改性剑麻纤维复合材料具有较高的活化能(155 kJ/mol)，这与基体-纤维界面的强相互作用有关。在微生物生长试验中，由于黑曲霉的酶降解，所有生物复合材料的分子量都有所下降。抗微生物能力最强的是含有丙烯化剑麻纤维的复合材料。DMTA和TGA也证实了添加丙酰化剑麻纤维后复合材料的微生物稳定性最高，微生物生长试验后性能变化最小。相比之下，PHBV-g-MA由于存在大的无定形区域而引起显著的酶促降解。

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来源期刊

Polimery Materials Science-Polymers and Plastics

CiteScore

2.90

自引率

6.20%

发文量

审稿时长

1 months

期刊介绍： The "Polimery" journal, of international circulation, is publishing peerreviewed scientific and technical research papers covering polymer science and technology in the field of polymers, rubbers, chemical fibres and paints. The range of topics covered are raw materials, polymer synthesis, processing and applications of polymers. Apart from scientific and technical research papers the monthly includes technical and commercial information such as reports from fairs and exhibitions as well as home, world and technical news. “Polimery "- an international journal covering the following topics: polymers, rubber, chemical fibres and paints. The Journal is addressed to scientists, managers and engineering staff of universities, Polish Academy of Sciences, R&D institutions, industry, specializing in polymer chemistry, physical chemistry, technology and processing. “Polimery” publishes original, reviewed research, scientific and technology papers in the field of polymer synthesis, analysis, technology and modification, processing, properties, applications and recycling.