Static and Dynamic Mechanical Behavior of Hydroxyapatite-Polyacrylic Acid Composites Under Simulated Body Fluid
Static and Dynamic Mechanical Behavior of Hydroxyapatite-Polyacrylic Acid Composites Under Simulated Body Fluid
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模拟体液下羟基磷灰石-聚丙烯酸复合材料的静态和动态力学行为
DOI：
10.3844/ajbbsp.2006.73.79
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发表时间：
2006
影响因子：
--
通讯作者：
D. Katti
中科院分区：
文献类型：
--
作者：
K. Katti;Phanikumar Turlapati;D. Verma;Rahul Bhowmik;P. Gujjula;D. Katti
在这项工作中，我们研究了羟基磷灰石/聚丙烯酸酯复合材料在干，湿和模拟体液条件下的力学响应。羟基磷灰石（HAP）在两种条件下矿化：一种是在聚丙烯酸存在下（原位HAP），第二种是在聚丙烯酸不存在下（异位HAP）。此外，原位和非原位HAP与聚丙烯酸混合以制备HAP/PAAc复合材料。用光声傅里叶变换红外光谱（PAS-FTIR）研究了PAAc与HAP之间的界面相互作用。通过将复合材料试样浸泡在模拟体液（SBF）中，研究了复合材料在潮湿条件下的力学响应。在潮湿条件下，SBF和水削弱HAP-HAP界面显着。PAS-FTIR数据表明，PAAc通过解离的羧酸基团连接到HAP。水和SBF浸泡的样品表现出蠕变行为，并表现出较大的残余应变卸载后。不同应变率下的加载对复合材料的力学性能有显著影响。原位和非原位70：30复合材料在应变速率为0.01秒-1时表现出最高的弹性模量。XRD研究表明，在SBF和水中浸泡3小时后，非原位复合材料中形成了Ca 2 P2 O 7相，而原位复合材料在SBF和水中浸泡相同的时间后仅存在羟基磷灰石相。
In this work, we have investigated mechanical response of hydroxyapatite/polyacrylic composites under dry, wet and simulated body fluid conditions. Hydroxyapatite (HAP) is mineralized under two conditions; one, in presence of polyacrylic acid (in situ HAP), second, in absence of polyacrylic acid (ex situ HAP). Further, in situ and ex situ HAP are mixed with polyacrylic acid to make HAP/PAAc composites. Interfacial interactions between PAAc and HAP have been studied using photoacoustic Fourier transform infrared spectroscopy (PAS-FTIR). The mechanical response of the composites under wet condition is studied by soaking composite samples in simulated body fluid (SBF). Under wet conditions, SBF and water weaken the HAP-HAP interface significantly. PAS-FTIR data suggests that PAAc attaches to HAP through the dissociated carboxylate groups. The water and SBF soaked samples showed creep-like behavior and exhibit large residual strain after unloading. Loading under different strain rates has significant effect on mechanical properties of these composites. Both in situ and ex situ 70:30 composites exhibit highest elastic modulus at strain rate of 0.01 sec-1. XRD study indicates formation of Ca2P2O7 phase in ex situ composite after soaking in SBF and water for 3 hours, whereas in situ composites showed presence of only hydroxyapatite phase after soaking in SBF and water for same duration of time.