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Biomass Chemical Engineering ›› 2019, Vol. 53 ›› Issue (3): 8-14.doi: 10.3969/j.issn.1673-5854.2019.03.002

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Preparation and Characterizations of Polyvinyl Alcohol-microcrystalline Cellulose-hexagonal Boron Nitride Composite Membrane

Xin GE,Houfu CHENG,Sentao HUANG,Jingwen CHEN,Fuxiu FU,Xunjun CHEN,Jianfang GE*()   

  • Received:2018-07-24 Online:2019-05-30 Published:2019-06-04
  • Contact: Jianfang GE E-mail:ge650704@163.com
  • Supported by:
    广东省应用型科技研发专项资金项目(2015B090925022);广东省工艺研究与能力建设项目(2016A010103037);仲恺农业工程学院研究生科技创新基金资助项目(KJCX2017007)

Abstract:

Microcrystalline cellulose(MCC) was extracted from pineapple leaf fibrous by means of pre-acid immersion, alkaline extraction and acid hydrolysis and the influences of mass fraction of sulfuric acid solution, temperature and reaction time on the reaction were discussed. The results showed that the optimum preparation conditions of MCC were mass fraction of sulfuric acid 64%, reaction temperature 45 ℃ and reaction time 90 min. Hexagonal boron nitride(h-BN) was used to modified MCC in order to gain h-BN-MCC composite powder. The products were mainly characterized by Fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy(SEM) and thermogravimetic analysis(TG). The results showed that the infrared spectrogram characteristic peaks were consistent with the reference and the mass loss of cellulose microcrystalline was 97% when the temperature raised to 700 ℃. The whisker lengths were about several to twenty microns and the diameters were 2-3 μm.Then the composite powder was dispersed in polyvinyl alcohol(PVA) to prepare h-BN-MCC-PVA composite membrane. Tensile strength and contact angle test were used to characterize the membrane. MCC could assist h-BN to compound with PVA well and tensile strength and elongation at break of h-BN-MCC-PVA composite membrane could be increased by 15.1% and 122.0% respectively. And the composite powder could enhance the hydrophobicity of the film and the contact angle could increase from 34.91° to 52.28°.

Key words: agricultural wastes, pineapple leaf fibrous microcrystalline, boron nitride, polyvinyl alcohol, composite

CLC Number: