Tough poly(ethylene glycol)-sized bacterial cellulose sheet for high impact strength laminated acrylic composites
Tough poly(ethylene glycol)-sized bacterial cellulose sheet for high impact strength laminated acrylic composites
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用于高冲击强度层压丙烯酸复合材料的坚韧聚乙二醇尺寸细菌纤维素片
DOI:
10.1016/j.compositesa.2022.106845
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Herrera N
中科院分区:
文献类型:
--
作者:
Herrera N
Dried and well-consolidated sheet of bacterial cellulose (BC) nanofibrils is a material structure that possesses high modulus and strength but is also brittle, which limits its potential in various advanced composite applications. Here, we report a simple method of enhancing the toughness of BC sheet by sizing the BC nanofibrils with poly(ethylene glycol) (PEG). This hinders interfibril hornification and facilitates large-scale BC nanofibril debonding, slippage and reorientation upon deformation. The PEG-sized BC sheets show high tensile strain-at-failure and work of fracture compared to neat BC sheet. PEG-sized BC reinforced laminated acrylic composites achieve a flatwise Charpy impact strength of up to 26 kJ m−2. This is a remarkable increase over the impact strength of neat impact-modified acrylic of only 12 kJ m−2, especially when the BC loading required to achieve this radical improvement is only 0.2 wt-%. Our study opens new paradigm in using low BC loading to achieve performance improvements suitable for high value composite applications.
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