High porosity cellulose nanopapers as reinforcement in multi-layer epoxy laminates

被引：22
|
作者：
Mautner, Andreas [1 ,2 ]
Nawawi, Wan M. F. W. [1 ,2 ,3 ]
Lee, Koon-Yang [4 ]
Bismarck, Alexander [1 ,2 ,5 ]
机构：
[1] Univ Vienna, Polymer & Composite Engn PaCE Grp, Inst Mat Chem & Res, Wahringerstr 42, A-1090 Vienna, Austria
[2] Imperial Coll London, Dept Chem Engn, Polymer & Composite Engn PaCE Grp, South Kensington Campus, London SW7 2AZ, England
[3] Int Islamic Univ Malaysia, Dept Biotechnol Engn, POB 10, Kuala Lumpur 50278, Malaysia
[4] Imperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, England
[5] Univ Johannesburg, Fac Engn & Built Environm, Dept Mech Engn, Johannesburg, South Africa
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2020年 / 131卷
关键词：
Cellulose A; Laminates A; Prepreg A; Thermosetting resin A; BACTERIAL CELLULOSE; COMPOSITES; NANOCELLULOSE; BIOCOMPOSITES; NETWORKS; MORPHOLOGY; POLYMERS; STRENGTH; DESIGN; PAPER;
D O I：
10.1016/j.compositesa.2020.105779
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Utilizing high-performance cellulose nanopapers as 2D-reinforcement for polymers allows for realizing high-loading-fraction (80 vol.-%), high-performance (strength >150 MPa, modulus >10 GPa) laminated nanopaper reinforced epoxy composites. Such cellulose nanopapers are inherently dense, which renders them difficult to be impregnated with the epoxy-resin. High-porosity nanopapers facilitate better resin impregnation, truly utilizing the properties of single cellulose nanofibres instead of the nanofibre network. We report the use of high-porosity (74%) but low strength and modulus bacterial cellulose (BC) nanopapers, prepared from BC-in-ethanol dispersion, as reinforcement for epoxy-resin. High-porosity nanopapers allowed for full impregnation of the BC-nanopapers with epoxy-resin. The resulting BC-reinforced epoxy-laminates possessed high tensile modulus (9 GPa) and strength (100 MPa) at a BC loading of 30 vol.-%, resulting from very low void-fraction (3 vol.-%) of these papregs compared to conventional nanopaper-laminates (10+ vol.-%). Better resin impregnation of less dense nanocellulose networks allowed for maximum utilization of stiffness/strength of cellulose nanofibrils.
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页数：9
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