English  |  正體中文  |  简体中文  |  Items with full text/Total items : 70585/70585 (100%)
Visitors : 23085950      Online Users : 608
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/26477

    Title: Kinetic study of chitosan-tripolyphosphate complex reaction and acid-resistive properties of the chitosan-tripolyphosphate gel beads prepared by in-liquid curing method
    Authors: Mi,FL;Shyu,SS;Lee,ST;Wong,TB
    Contributors: 化學工程與材料工程學系
    Date: 1999
    Issue Date: 2010-06-29 17:28:58 (UTC+8)
    Publisher: 中央大學
    Abstract: Chitosan gel beads were prepared using am in-liquid curing method by the ionotropic crosslinking with sodium tripolyphosphate. Crosslinking characteristics of the chitosan-TPP beads were improved by the modification of in-liquid curing mechanism of the beads in TPP solution. Chitosan gel beads cured in pH value lower than 6 were really ionic-crosslinking controlled, whereas chitosan gel beads cured in pH values higher than 7 were coacervation-phase :inversion controlled accompanied with slightly ionic-crosslinking dependence. According to the result, significantly increasing the ionic-crosslinking density of chitosan beads could be achieved by transferring the pH value of the curing agent, TPP, from basic to acidic. The swelling behavior of various chitosan beads in acid appeared to depend on the ionic-crosslinking density of the chitosan-TPP beads that were deeply affected by the curing mechanism of the beads. The mechanism of chitosan-TPP beads swollen in weak acid was chain-relaxation controlled, while the mechanism of chitosan-TPP beads swollen in strong acid seem to be not only chain-relaxation but also chain-scission controlled. Chitosan-TPP beads prepared in acidic TPP solution decreased the chain-scission ability due to the increase of ionic crosslinking density of the beads. By the transition of curing mechanism, the swelling degree of chitosan-TPP beads was depressed, and the disintegration of chitosan-TPP beads would not occur in strong acid. The mechanism of ionic-crosslinking reaction of chitosan beads could be investigated by an unreacted core model, and the curing mechanism of the chitosan beads is mainly diffusion controlled when higher than 5% of chitosan was employed. (C) 1999 John Wiley & Sons, Inc.
    Appears in Collections:[化學工程與材料工程研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明