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The study of tri-phasic interactions in nano-hydroxyapatite/konjac glucomannan/chitosan composite

Gang, Zhou, Yubao, Li, Li, Zhang, Hong, Li, Mingbo, Wang, Lin, Cheng, Yuanyuan, Wang, Huanan, Wang, Pujiang, Shi
Journal of materials science 2007 v.42 no.8 pp. 2591-2597
X-ray diffraction, X-ray photoelectron spectroscopy, chitosan, composite polymers, crystal structure, crystallization, hydrogen bonding, infrared spectroscopy, konjac mannan, transmission electron microscopy
The interactions among the three phases of nano-hydroxyapatite (n-HA), Konjac glucomannan (KGM) and Chitosan (CS) in n-HA/KGM/CS composite were investigated using TEM, IR, XRD, XPS and TGA methods. The crystalline structure of n-HA was studied by means of Rietveld method. A series of structure parameters, such as, cell lattice parameters (a or c), bonding lengths and a numerical index of distortion for PO₄ tetrahedron, were calculated by Newton–Raphson calculating method to characterize the crystalline structure of HA at atom level. The results showed that n-HA was mainly linked with KGM and CS by hydrogen bonding between OH⁻–PO ₄³⁻ of n-HA and –C=O, –NH of KGM-CS copolymer, and there was a stable interface formed between the three phases in the composite. Besides, orientation of this hydrogen bonding resulted in the decrease of the relative crystallization degree of KGM-CS copolymer.