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RISS 인기검색어
- 검색키워드
- 저자 : I.S. Elashmawi (검색결과 2 건)
- 무료
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Spectroscopic studies of hydroxyapatite in PVP/PVA polymeric matrix as biomaterial
I.S. Elashmawi,H.E. Abdel Baieth 한국물리학회 2012 Current Applied Physics Vol.12 No.1
This system is focusing on characterization and spectroscopic studies of PVA and PVP blend and the blend filled with various mass fractions (2.5, 5 and 10%) of HAp because it has great potential for applications in the medical purposes. The films have been prepared by solution casting technique. The characteristic properties of the films were examined by FT-IR, X-ray, SEM, TGA and DSC techniques from room temperature to 500 ℃. XRD scans reveal the semicrystalline nature of the prepared films and demonstrated that complexation between the blend and the HAp were occur. SEM and thermal studies confirmed these results. Three main weight loss regions were observed in TGA thermograms that reveal reduction in the thermal stability of the prepared samples as HAp content increases. Three main transition peaks were observed in DSC with a single Tg which indicates a good miscibility of the films. The ratio Ca:P is 1.65:1 which confirm the formation of hydroxyapatite. So, the present work can be used in various bio-applications.
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Structural, optical, thermal and electrical studies on PVA/PVP blends filled with lithium bromide
E.M. Abdelrazek,I.S. Elashmawi,A. El-khodary,A. Yassin 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Films of PVA/PVP blend (50/50) filled with different concentrations of LiBr were prepared. The prepared films were investigated by different techniques. XRD scans demonstrate that complexation between the filler and the blend takes place in the amorphous region. UV–VIS analysis revealed that the values of the optical energies are changed with increase Li-ions content. This indicates that there is a charge transfer complexes arise between the polymer blend and Li-ions. The thermal stability of the product samples has improved after filling LiBr increases, this indicates that the filler acts as a plasticizer. The rise of the conductivity is significant with increased concentration of LiBr, this is means the decrease in the degree of crystallinity and increase in the degree of amorphosity. This suggests the choice of LiBr as filler to improve the electrical conductivity of PVA/PVP.
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