期刊
CARBOHYDRATE POLYMERS
卷 207, 期 -, 页码 246-255出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.11.073
关键词
Konjac glucomannan; Aerogel; Thermal conductivity; Mechanical property; Hydrophobicity
资金
- National Natural Science Foundation of China [21476267]
- Hunan Natural Science Foundation [2018JJ2482]
Konjac glucomannan (KGM) aerogel was prepared by a facile freeze-drying process, which was used as green sustainable biopolymer matrix to synthesis three-dimensional (3D) network interpenetrated KGM-SiO2 aerogel with thermal insulation performance and high mechanical properties. Herein, we explored that the potential structure-performance relationship of KGM aerogel between the physical parameters, morphology and thermal insulation. Besides, the preparation conditions of KGM aerogel including concentration of KGM, Na2CO3-to-KGM mass ratio were investigated. Meanwhile, the KGM aerogel and KGM-SiO2 aerogel were characterized using scanning electron microscopy, Fourier transform infrared spectrometer, Brunauer-Emmett-Teller method, thermogravimetric analysis and contact angle test. Results showed that the as-prepared KGM aerogel exhibited excellent thermal insulation performance (lambda = 0.021W m(-1) K-1) and low bulk density (rho=0.030 g cm(-3)) when concentration of KGM was 2 wt% and Na2CO3-to-KGM mass ratio of 0.12. In order to improve the mechanical properties and high hydrophobicity of biopolymer aerogel, a novel of KGM-SiO2 aerogel was successful fabricated by incorporating methylsilsesquioxane (MTES) derived SiO2 into the KGM matrix via the freeze-drying method. The obtained aerogel exhibited remarkable compressive strength (delta(max)= 1.65 MPa at 80% strain), high specific surface area of 416.1 m(2) g(-1), high hydrophobicity (theta = 146 degrees for water) and low thermal conductivity of 0.032-0.039W m(-1) K-1. Thus, the high-performance KGM-SiO2 aerogel would be further expand the thermal insulation application in sustainable development and energy-saving building.
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