PROPERTIES OF HYDROXYAPATITE PREPARED BY THE HYDROLYSIS OF TRICALCIUM PHOSPHATE
PROPERTIES OF HYDROXYAPATITE PREPARED BY THE HYDROLYSIS OF TRICALCIUM PHOSPHATE
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DOI：
10.1002/jctb.280310105
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发表时间：
1981-01-01
影响因子：
3.4
通讯作者：
KANAZAWA, T
中科院分区：
文献类型：
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作者：
MONMA, H;UENO, S;KANAZAWA, T
以α-磷酸三钙为原料，通过水解法制备了非化学计量比的羟基磷灰石。磷灰石是以粉末的形式获得的，在水解过程中在搅拌和不搅拌的情况下硬化。该磷灰石具有与沉淀的非化学计量比羟基磷灰石相似的一般配方、特征脱水和热解行为。此外，它还表现出一些新的现象(473K以上晶格水与PO43ESR发生热反应，473K以上形成−中心，873K-973K消失，873K-973K略有失重)。磷灰石颗粒是由沿磷灰石结构的c轴或{100}面生长的圆柱状棒状或薄刀片聚集而成。采用不同的水溶性添加剂制备了气孔率在55%以上、体积密度在1.4g cm−3以下的硬化磷灰石材料。硬化材料的抗压强度为20~500kgcm−2，抗弯强度为10~120kgcm−2。通过用甲基丙烯酸甲酯聚合物浸渍硬化材料，强度至少提高了两到三倍。
Non‐stoichiometric hydroxyapatite was prepared by the hydrolysis of α‐tricalcium phosphate. The apatite was obtained as a powder and hardened with and without stirring during the hydrolysis. The apatite had a general formula, characteristic dehydration and pyrolysis behaviour similar to that of precipitated non‐stoichiometric hydroxyapatite. In addition, it exhibited some new phenomena (i.e. thermal reaction between lattice H2O and PO43−above 473 K, formation of ESR centres above 473 K and disappearance at 873–973 K, and a slight weight loss at 873–973 K). Apatite particles were composed of aggregates of cylindrical rods or thin blades grown along the c‐axis or {100} faces of apatite structure. Hardened apatite materials with various porosities above 55% and bulk densities below 1.4 g cm−3were obtained by using different water‐soluble additives. The strength of the hardened materials was 20–500 kg cm−2in compression and 10–120 kg cm−2in bending. The strengths were improved at least two to three times by impregnating the hardened materials with methyl methacrylate polymer.