Effect of Polymerization Temperature on Polymerization Degree and Structure of Calcium Polyphosphate

doi:10.3724/SP.J.1077.2012.00174

Abstract

Abstract:

The properties of calcium polyphosphate (CPP) were greatly affected by its polymerization degree. A series of CPP with different polymerization degree were prepared by polymerization of calcium phosphate monobasic monohydrate (MCP) at different temperatures. Polymerization degree was analyzed by liquid state ³¹P nuclear magnetic resonance (³¹P-NMR). The effect of different temperature on polymerization degree and structure of CPP was discussed. MCP was analyzed by differential scanning calorimetry-thermmogravimetry (DSC-TGA) and possible mechanism of the polymerization reaction was proposed. The results show that polymerization of MCP mainly produces CPP. When the elevation temperature is below 1000℃, polymerization degree increases; however the opposite is true when the polymerization temperature exceeds 1000℃. Additionally, the formation of a ring-structure phosphate, namely calcium metaphosphate (CMP), is also promoted with increasing polymerization temperature. The CMP content increases with increasing polymerization temperature and significantly increases when the polymerization temperature is above 1000℃.

Key words: bioceramic, calcium polyphosphate (CPP), polymerization degree, polymerization temperature

CLC Number:

O613

WU Hang, ZHANG Li-Fang, BAI Wei, MA Chi, XIONG Cheng-Dong. Effect of Polymerization Temperature on Polymerization Degree and Structure of Calcium Polyphosphate[J]. Journal of Inorganic Materials, 2012, 27(2): 174-178.

Figures/Tables 7

Fig. 1 Reaction for forming calcium polyphosphate

Fig. 2 31P-NMR spectra of calcium polyphosphate

Fig. 3 Effect of temperature on polymerization degree of calcium polyphosphate

Fig. 4 Effect of temperature on calcium metaphosphate content in the calcium polyphosphate

Fig. 5 31P-NMR spectra of calcium polyphosphate prepared at 1200℃

Fig. 6 The DSC-TGA curves of calcium phosphate monobasic monohydrate (10 ℃/min)

Fig. 7 Mechanism of polymerization of calcium phosphate monobasic monohydrate

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