摘要
聚合度作为一个重要影响因素对聚磷酸钙的性能必然产生影响.采用磷酸二氢钙作为原料,在不同聚合温度下制备了聚磷酸钙.采用31P核磁共振波谱测定聚磷酸钙的聚合度,评价聚合温度对聚合度及结构的影响,结合磷酸二氢钙差示扫描量热热失重分析结果,提出了磷酸二氢钙缩聚反应的机理.结果表明,磷酸二氢钙缩聚产物以聚磷酸钙为主,当聚合温度低于1000℃时,升高聚合温度有利于聚合度的增大,1000℃以上则反之;此外,升高聚合温度促进环状结构(偏磷酸钙)的生成,其含量随聚合温度的升高而增大且1000℃以上增幅较大.
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℃.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第2期174-178,共5页
Journal of Inorganic Materials
基金
中国科学院"西部之光"基金~~
关键词
生物陶瓷
聚磷酸钙(CPP)
聚合度
聚合温度
bioceramic
calcium polyphosphate（CPP）
polymerization degree
polymerization temperature
