Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (6): 127-132.doi: 10.3969/j.issn.1000-565X.2013.06.020

• Materials Science & Technology • Previous Articles     Next Articles

Synthesis,Structure and Thermal Property of Dialdehyde Carboxymethyl Cellulose Prepared at Low pH Value

Ye Jun1,2 Li Wen- hao1,2 Xiong Jian2   

  1. 1.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2.School of Light Chemistry and Food Sciences,South China University of Technology,Guangzhou 510640,Guangodng,China
  • Received:2012-10-15 Revised:2012-11-26 Online:2013-06-25 Published:2013-05-03
  • Contact: 熊犍(1965-)，男，博士，教授，主要从事纤维素及其他天然高分子结构与性能的研究． E-mail:lcjxiong@scut.edu.cn
  • About author:叶君(1963-)，女，博士，教授，主要从事植物资源化学研究．E-mail:jye@scut．edu．cn
  • Supported by:

    国家“973” 计划项目(2010CB732201);国家自然科学基金资助项目(31270617);高分子材料工程国家重点实验室开放课题基金资助项目(KF201301)

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Abstract:

Dialdehyde carboxymethyl cellulose (DACMC) was synthesized by oxidizing carboxymethyl cellulose (CMC) with periodate NaIO4 at low pH value,and the effects of pH value on the oxidation degree of CMC,as well as on the crystal structure,morphology and thermal stability of DACMC,were investigated by means of FT- IR,13C NMR,XRD and AFM.The results show that (1) pH value significantly and irregularly affects the oxidation degree of DACMC,and the oxidation degree reaches its maximum at pH 1.5,with an aldehyde content of 54.35%; (2) carbonyl groups are introduced into the molecular chain of CMC,which is verified by FT- IR and 13C NMR results; (3) the crystallinity of DACMC is higher than that of CMC and increases with pH value; (4) due to the break of glucopyranose rings，the molecular chain of DACMC becomes softer,entangles with each other more compactly and arranges more regularly,while the Z dimension of DACMC surface decreases with the increase of aldehyde content; and (5) the thermal stability of DACMC is poorer than that of CMC,especially in the condition of pH 1.5.

Key words: carboxymethyl cellulose, dialdehyde carboxymethyl cellulose, periodate, aldehyde content, crystalli-nity degree, thermal stability

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