Polymeric crystallization and condensation of calcium polyphosphate glass
Materials Research Bulletin(2008)
摘要
Calcium polyphosphate (Ca(PO3)2)n (CPP) is under investigation as a resorbable bone biomaterial. Sintering CPP glass particles in humid air produces a porous, interconnected, degradable, crystalline construct that is suitable for connective tissue engineering applications. Porous CPP constructs sintered at 585°C dissolved in water more rapidly than those sintered at 950°C. FTIR, 31P NMR, powder XRD, and density data for CPP glass and fully crystalline fibers were compared with data for the as-sintered and partially dissolved constructs sintered at 585 or 950°C. The results suggest that condensation continues during sintering, and CPP glass crystallizes in a process analogous to the crystallization of linear organic polymers. During sintering, water vapor caused hydrolytic degradation of the surface polyphosphate chains, forming a surface layer with different dissolution properties than the particle interior. Thus, sintering CPP glass results in a heterogeneous crystalline product that impacts the dissolution rate of CPP as a degradable biomaterial.
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关键词
A. Ceramics,B. Crystal growth,C. Infrared spectroscopy,C. Nuclear magnetic resonance,C. X-ray diffraction
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