Study on the Alloy of Water-borne Polyurethane and Chitosan

• Main Authors: Chia-Hun Tsai, 蔡佳樺
• Other Authors: Shin-shing Shyu
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/17898204912854468321

碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 91 === Three research subjects were studied in this paper; first: Synthesis of O-Carboxymethyl Chitosan (OCC), second: blending of OCC with polyurethane anionomer (WPU-anionomer) and blending of chitosan with polyurethane cationomer (WPU-cationomer) by high concentration of crosslinking agent such as glutaradehyde; third: WPU-cationomer /chitosan membrane prepared by wet process. Morphology and mechanical properties of membranes were studied by Scanning Electron Microscopy (SEM), Dynamic Machine Analysis (DMA) and Instron, antimicrobial ability of membranes was investigated by antibacterial test against E. coli. OCC was prepared by chemical modify the OH- group in the sixth carbon of chitosan to CH2COO-. Owing to the good hydrophilic property of CH2COO- group, OCC can blend with polyurethane anionomer easily. In order to increase the thermal stability of the blend membranes, glutaraldehyde or Ethylene, Polyethlen Glycol Diglycidyl Ether (EGDE) was used as crosslinking agent to form semi-IPN. The physical properties of WPU-anionomer/OCC semi-IPN were compared with that of WPU-cationomer/chitosan crosslinked by high concentration glutaradehyde. In order to have a thermal stable membrane without any crosslinking agent, we also prepared a WPU-cationomer/chitosan membrane by wet process. WPU-anionomer/OCC blend membranes have better thermal stability and mechanical properties than that of WPU-anionomer. The ultimate elongation of ether type WPU-anionomer/OCC membrane increase with increasing the concentration of crosslinking agent EGDE. The WPU-cationomer/chitosan blend membrane proparaed by wet process maintain their original flexibility but have better thermal stability and mechanical strength than that of WPU-cstionomer. Antibacterial test demonstrate that WPU-cationomer blending with chitosan has better antimicrobial capability against E. coli.