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RISS 인기검색어
- 검색키워드
- 저자 : A. El-khodary (검색결과 2 건)
- 무료
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A study of the physical properties of FeCl3 filled PVA
A. Tawansi,A. El-Khodary,M.M. Abdelnaby 한국물리학회 2005 Current Applied Physics Vol.5 No.6
Polyvinyl alcohol (PVA) lms lled with various mass fractions of FeCl3 were prepared using a casting method. The structural,electrical and magnetic properties were claried. The lling level (FL) dependence of certain IR absorption peaks was correlatedwith the obtained physical parameter characterizing the other properties. The XRD scans revealed a semicrystalline feature ofthe virgin polymer and an existence of two halos. The FL dependence of the intensity of the two halos was studied. The dc electricalresistivity was measured in the temperature range of 300400K. An intrachain one-dimensional interpolaron hopping mechanismwas assumed to interpret the electrical conduction. The temperature dependence of the dc magnetic susceptibility exhibited a CurieWeiss behavior in the range of 90270K. The ESR studies of PVA lled with various mass fractions of FeCl3 revealed very com-plicated spectra due to hyperne and ne structure. The evolution of the ESR spectra with the FL suggested the distribution of Fe3+ions in isolated and then aggregated modes within the PVA matrix..
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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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