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Chemically Modified Konjac Glucomannan Nanocrystal and Its Effects on Polyurethane

Author: ShenDan
Tutor: GaoShanJun
School: Wuhan University of Technology
Course: Materials Science
Keywords: Konjac polysaccharide Nano crystal Surface chemical modification Polyurethane Nanocomposites
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 77
Quote: 0
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Abstract


Nanoparticles used as a reinforcing filler inorganic nanoparticles, the use of inorganic nanoparticles not only cause serious accumulation of problems, but also for humans and the environment has a great impact. Natural polysaccharide-based organic nano-particles have a reinforcing effect of the same with an inorganic nano-particles, and avoids the problem of the inorganic nanoparticles. Konjac is our specialty resources, abundant yield. As a natural polymer, konjac glucomannan (KGM) nanoparticles have the potential to become environmentally friendly alternative to inorganic nanoparticles reinforcing filler. In this paper, the main contents are as follows: 1 by acid hydrolysis of konjac glucomannan KGM nanocrystalline to benzoyl chloride KGM nanocrystalline surface chemical modification, in order to reduce the surface energy of the nanocrystals so that it can be a good dispersed in an organic solvent. The product IR spectra proved successful KGM Nanocrystalline modified, having the same crystalline form of the product XRD diffraction tests showed that after chemical modification of KGM Nanocrystalline original Nanocrystalline static water contact angle and wettability The experiment confirmed that after chemical modification of the benzoyl chloride, successfully reduce the the KGM the Nanocrystals surface polarity, and a transmission electron microscope to characterize the the KGM modified nanocrystalline showing the same sheet-like structure with unmodified nanocrystalline . 2 through a series of different content is prepared in the method of the glass sheet was cast polyurethane / KGM nano crystal composite film. Mechanical test results showed that the content is less, the KGM nanocrystalline polyurethane matrix shows the enhancement effect, and no obvious nanocrystalline aggregates. When the the KGM Nanocrystalline content of 0.5wt%, the tensile strength of the polyurethane film by pure polyurethane 1.19MPa increased to 1.37 MPa to increase as the content of Nanocrystalline the tensile strength of the polyurethane film is showing a downward trend. Scanning electron microscopy, infrared spectroscopy, XRD diffraction indicates that when the The KGM nanocrystalline content of 0.5wt%, the nano-crystal dispersed in the composite membrane is preferably urethane group exhibit strong interaction. 3 through a series of different content is prepared in the method of the glass sheet was cast polyurethane / KGM modified nanocrystalline composite film. Scanning electron microscopy, infrared spectroscopy, XRD diffraction KGM modified nano-crystalline polyurethane matrix have good compatibility, allowing greater interaction between the filler and the matrix, and to achieve the purpose of reinforcing and toughening. Mechanics tests showed that with the increase of the modified KGM Nanocrystalline content, the tensile strength and elongation at break of a polyurethane composite film upward trend, when the modified KGM Nanocrystalline content of 2.0wt%, the composite membrane having a maximum The tensile strength and maximum elongation at break and elongation at break increased from 144.44% to 382.44% of pure polyurethane, an increase of 164.74%. This change fully reflects the need for chemical modification of KGM nanocrystalline, and successfully obtained a new type of organic nanocomposites. The work relating to the natural polysaccharide nanocrystals modified method and its enhancements the polyurethane matrix organic nanocomposites Preparation and Characterization of the research, and provides an important scientific basis for the further development and utilization of natural polysaccharide organic nanoparticles. This article has important theoretical significance and application prospects, and in the interests of the national environmental policy and sustainable development strategies.

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