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| Titel: |
Static and Dynamic Mechanical Behavior of Hydroxyapatite-Polyacrylic Acid Composites Under Simulated Body Fluid |
| Auteur: |
Kalpana S. Katti Phanikumar Turlapati Devendra Verma Rahul Bhowmik Praveen K. Gujjula Dinesh R. Katti |
| Verschenen in: |
American journal of biochemistry and biotechnology |
| Paginering: | Jaargang 2 (2006) nr. 2 pagina's 73-79 |
| Jaar: |
2006 |
| Inhoud: |
In this work, we have investigated mechanical response of hydroxyapatite/polyacryliccomposites under dry, wet and simulated body fluid conditions. Hydroxyapatite (HAP) is mineralizedunder two conditions; one, in presence of polyacrylic acid (in situ HAP), second, in absence ofpolyacrylic acid (ex situ HAP). Further, in situ and ex situ HAP are mixed with polyacrylic acid tomake HAP/PAAc composites. Interfacial interactions between PAAc and HAP have been studiedusing photoacoustic Fourier transform infrared spectroscopy (PAS-FTIR). The mechanical response ofthe 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-FTIRdata suggests that PAAc attaches to HAP through the dissociated carboxylate groups. The water andSBF 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 thesecomposites. Both in situ and ex situ 70:30 composites exhibit highest elastic modulus at strain rate of0.01 sec-1. XRD study indicates formation of Ca2P2O7 phase in ex situ composite after soaking in SBFand water for 3 hours, whereas in situ composites showed presence of only hydroxyapatite phase aftersoaking in SBF and water for same duration of time. |
| Uitgever: |
Science Publications (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 5 gevonden artikelen
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