The influence of alkaline treatment on the mechanical and structural properties of bacterial cellulose

被引：26

作者：

Chen, Si-Qian ^{[1
]}

Meldrum, Oliver W. ^{[2
]}

Liao, Qiudong ^{[1
,3
]}

Li, Zhaofeng ^{[1
,4
]}

Cao, Xiao ^{[1
]}

Guo, Lei ^{[5
]}

Zhang, Shuyan ^{[1
]}

Zhu, Jie ^{[1
]}

Li, Lin ^{[1
]}

机构：

[1] Dongguan Univ Technol, Sch Chem Engn & Energy Technol, Key Lab Hlth Food Dev & Nutr Regulat China Natl L, Dongguan 523808, Peoples R China

[2] Nanyang Technol Univ, Lee Kong Chian Sch Med, Singapore 308232, Singapore

[3] South China Agr Univ, Coll Food Sci, Guangzhou 510642, Peoples R China

[4] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Peoples R China

[5] Univ Queensland, Sch Informat Technol & Elect Engn, Brisbane, Qld 4072, Australia

来源：

CARBOHYDRATE POLYMERS | 2021年 / 271卷

基金：

中国国家自然科学基金;

关键词：

Komagataeibacter hansenii; Bacterial cellulose; Hydrogel; Sodium hydroxide; Porosity; Fibre; Rheology; CRYSTALLINITY; HYDROGELS; IMPACTS; STRAINS; SYSTEMS; FIBERS;

D O I：

10.1016/j.carbpol.2021.118431

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The unique mechanical properties of hydrated bacterial cellulose make it suitable for biomedical applications. This study evaluates the effect of concentrated sodium hydroxide treatment on the structural and mechanical properties of bacterial cellulose hydrogels using rheological, tensile, and compression tests combined with mathematical modelling. Bacterial cellulose hydrogels show a concentration-dependent and irreversible reduction in shear moduli, compression, and tensile strength after alkaline treatment. Applying a poroelastic biphasic model to through-thickness compressive stress-relaxation tests showed the alkaline treatment to induce no significant change in axial compression, an effect was observed in the radial direction, potentially due to the escape of water from within the hydrogel. Scanning electron microscopy showed a more porous structure of bacterial cellulose. These results show how concentration-dependent alkaline treatment induces selective weakening of intramolecular interactions between cellulose fibres, allowing the opportunity to precisely tune the mechanical properties for specific biomedical application, e.g., faster-degradable materials.

引用

页数：9

共 36 条

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