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| Study of Rheological Property of Chitosan-montmorillonite and Chitosan-clay Nanocomposites and the Effect of Its Application in Coatings on the Barrier Property of Paper |
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| DOI：10.11981/j.issn.1000-6842.2016.02.1 |
| Key Words:chitosan-montmorillonite nanocomposite； chitosan-clay nanocomposite； rheology property; barrier property |
| Fund Project:国家自然科学基金项目(31370583)；2014年江苏省品牌专业建设工程一期项目。 |
| Author Name | Affiliation | | 吴新磊 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 景 宜* | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 |
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| Abstract: |
| The influence of different dosage of silicate and dispersing rate on the rheolgical properties of chitosan-montmorillonite and chitosan-clay nanocomposites were studied by using the rheological analyzer. The surface morphological characteristics of the papers which were respectively coated with the two nanocomposites were analysed by AFM. Water vapor transmission rate of the coated paper was also investigated. The results showed that the viscosity of chitosan-montmorillonite nanocomposite increased with the content of montmorillonite increasing. But the viscosity of fluid decreased when the dosage of montmorillonite was 12%, because of the intensive wrapping effect of chitosan to montmorillonite and the water swelling of montmorillonite. The greater the dispersion velocity of montmorillonite, the greater the dependence of the apparent viscosity of fluid to the shear rate. Chitosan-montmorillonite nanocomposite was a typical non-newtonian pseudoplastic fluid and showed a typical “shear thinning” phenomenon. The viscosity of chitosan-clay nanocomposite increased with the dosage of clay increasing. Its non-newtonian behavior was more significant than chitosan-montmorillonite. The phenomenon of shear thickening happened with the dispersion velocity increasing, because mechanical stirring force was not enough to destroy the strong hydrogen bonding between the layers of clay. The wrapping effect of chitosan to clay particles was weak. The viscosity of chitosan-clay nanocomposite was higher than that of chitosan-montmorillonite nanocomposite. The better the rheology of fluid, the better formation and smoothness of the coated layers. So the ability to resist water and oxygen vapor permeability of chitosan-montmorillonite nanocomposite was better than that of chitosan-clay nanocomposite． |
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