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Preparation and Characterization of the Complex Film of Polyvinyl Alcohol and Nano Glucose Acid Montmorillonite

Author: JiangHongPeng
Tutor: WeiTengYou
School: Guangxi University
Course: Chemical processes
Keywords: Polyvinyl alcohol Nano gluconic acid montmorillonite Modification Composites
CLC: TB332
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 0
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Abstract


The polyvinyl alcohol (PVA) is a kind of polyhydroxylated polymers, which has good water-solubility and biocompatibility. However, the application of PVA was restricted by the poor resistance of water and mechanical properties. Nano glucose acid montmorillonite (NGAM) is a kind of nanometer organic montmorillonite modified hydroxyl with surface which prepared by gluconic acid and Ca-bentonite.To improve the mechanical strength, resistance of water and heat for PVA, NGAM was added as a modifier of physical composite and PVA/NGAM nanocomposite material was prepared.Firstly, the optimal conditions for preparing NGAM were determined. The optimal raw material, preparation methods and addition amount of NGAM were selected with the viscosity of complex solution composed by PVA/NGAM as indicator in the preparation process of NGAM.Secondly, to improve its dispersion, NGAM were treated by the mechanical stirring and the mechanical stirring with ultrasound-assisted in glycerine, respectively. After that, the dispersion was added into PVA and the complex was prepared. The optimal method was confirmed with mechanical strength of the film.Finally, the optimal conditions for preparing the film such as addition amount of NGAM, the concentration of PVA and the glycerine content were dermined with mechanical properties, water and heat resistance, light transmission as indicators. And the complex film was characterized by IR, XRD and SEM.The results show that the maximum of tensile strength for the composite films can improve45%, water resisting property is2.7times longer and its thermo-decomposing temperature can increase34℃, elongation at break and transmittance decreased less than13%and5%, respectively when glycerin is3%of the consumption for PVA, the concentration of PVA emulsion is10%, and the addition amount NGAM is less than3%.The formulation of the hydrogen bonding between NGAM and PVA molecules has been approved in the infrared spectra. The results of determination of complex film by XRD indicated the shape of crystal had no change. And results of SEM showed that nano-particle has uniform distribution. This study enlarged application area of PVA and it will be applied widely in industry.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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