Novel Hybrid Materials Obtained During the Crystalline Growth of Layered Double Hydroxides Using Grafted Chitosan as a Template

作者：Sun Yanqing; Zhou Yuming^*; Wang Zhiqiang

来源：Journal of Inorganic and Organometallic Polymers and Materials, 2009, 19(4): 436-442.

DOI：10.1007/s10904-009-9292-6

• CTS
• Layered double hydroxides
• Acrylic acid
• Graft copolymerization
• Biomineralization
• Infrared emissivity

To overcome some limitations of layered double hydroxides (LDH)-type materials in efficient development of composites with biopolymers, a templating method was employed based on graft copolymerization of acrylic acid onto CTS and successive impregnation of the LDH into the interstices of the grafted CTS matrix. The results indicated that, with gradual increase in the stirring speed, grafted CTS experienced evolutions from formless bulky agglomerations to well-dispersed spheroids and then to a well-ordered matrix of a copolymer network. In the subsequent templating synthesis, an LDH-type phase was formed and an LDH replica was obtained either by dissolution of the grafted CTS or by a calcination-reconstruction process. It was found that the copolymer network showed superiority over spheroids on adsorption of metal ions and efficient combination with the LDH that was generated in situ. The growth of LDH crystallites was templated and inhibited by the grafted copolymer, thereby filling the template voids of the matrix network in the form of a club at the nanometer scale with a load content up to 38.7 wt%. This type of novel hybrid biomaterial exhibited potential use in infrared camouflage by achieving a minimum emissivity value of 0.351 due to regular and ordered inorganic-organic combinations with large synergistic interfaces at molecular level.

• 出版日期2009-12
• 单位东南大学