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VISCOMETRIC INVESTIGATIONS OF POLYVINYLPYRROLIDONE IN MIXED SOLVENTS AND WITH VARYING TEMPERATURE

Chinese Journal of Polymer Science 2005年第4期23卷 367-371页

作者： omar melad omar Abu-Tiem Rajai Baraka Chemistry Department

The viscosity behavior of polyvinylpyrrolidone(PVP)has been determined at 25℃ in mixed solvents comprising water/dimethylformamide(DMF)and water/methanol(MeOH).Analysis of the data has considered the PVP as being both host and guest polymer in *** intrinsic viscosity of PVP in DMF is higher than in water and in MeOH,but also increases in a mixed solvent with high water content because of the effect of polymer-solvent *** was also found that the intrinsic viscosity of PVP at finite concentration,[η_(pvp)]_c decreases with an increase in the concentration of PVP in *** viscosity behavior of PVP in a mixed solvent is affected by the concentration-dependent intermolecular excluded volume effect,which can be quantitatively expressed by the parameter,b_Y,which reflects the shrinkage of PVP chain coils,resulting in a decrease of[η_(pvp)]_*** effect of temperature on the viscosity behavior of PVP in MeOH shows that the interaction parameter increases up to a maximum value,and then decreases after a certain temperature.

关键词： Polyvinylpyrrolidone Intermolecular excluded volume effect Intrinsic viscosity

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VISCOMETRIC STUDY OF POLY(METHYL METHACRYLATE) AND POLYSTYRENE BLENDS IN DIFFERENT SOLVENTS

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Chinese Journal of Polymer Science 2003年第1期21卷 15-19页

作者： omar melad Rajai Baraka Jamil K.J.Salem Hani Hilles Awni El-Khazandar Department of Chemistry AL-Azhar University P.O. Box 1277 GAZA PalestineDepartment of Chemistry AL-Azhar University P.O. Box 1277 GAZA PalestineDepartment of Chemistry AL-Azhar University P.O. Box 1277 GAZA PalestineDepartment of Chemistry AL-Azhar University P.O. Box 1277 GAZA PalestineDepartment of Chemistry AL-Azhar University P.O. Box 1277 GAZA Palestine

The intermolecular interaction between poly(methyl methacrylate) (PMMA) and polystyrene (PS) intetrahydrofuran (THF) and N,N'-dimethyl formamide (DMF) solvents was studied at 28℃ using a dilute solution viscometrymethod. Solvent is believed to play a key role in characterizing the viscosity behavior of the polymer solution. The intrinsicviscosity and viscosity interaction parameter were experimentally measured for the binary (solvent/polymer) and for theternary systems in two solvents. The compatibility of the polymer mixture was discussed in terms of the sign of △b_m. Theresults show that the compatibility of PMMA/PS blend in DMF is larger than that in THF.

关键词： Viscometry Compatibility PMMA/PS blend

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Copolymers of Aniline with O-Anthranilic Acid: Synthesis and Characterization

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Open Journal of Organic Polymer Materials 2015年第2期5卷 31-36页

作者： omar melad Moataz Esleem Chemistry Department Al-Azhar University Gaza Palestine

Chemical copolymerization of aniline with o-anthranilic acid in aqueous 1 M HCl was carried out at different molar ratios of aniline and o-anthranilic acid, and was characterized by FTIR and UVVisible spectroscopy, elemental analysis and electrical conductivity. From FTIR and UV-Visible spectroscopy, we observed that o-anthranilic acid had been introduced into the polymer chain successfully. The percent yield of o-anthanilic acid copolymer with aniline decreases as the percent of aniline increases. An increase in the % C can be observed as the amount of o-anthranilc acid in the copolymer decrease or the amounts of aniline increase. Copolymerization of aniline with o-anthranilic acid would improve the resulting polymer via increasing the molecular weight and the conductivity as well.

关键词： Polyaniline Copolymerization O-Anthranilic Acid Conductivity

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Possible Geological Reason for the Missing of the Oligocene Section in Sector (5) and Its Vicinity, Deryanah-Al Abyar Area, Al Jabal Al Akhdar, NE Libya

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Open Journal of Geology 2013年第4期3卷 322-329页

作者： omar B. Elfigih Hamza S. melad Department of Earth Sciences Faculty of Science University of Benghazi Benghazi Libya

The existing stratigraphic framework of the Eocene-Miocene in the study area (sector 5) shows limited temporal stratigraphic and structural resolution. Using this framework, it is difficult to unravel the influence of possible local tectonic movements and eustatic sea level changes on sedimentation. The precise influence of the onset of the possible Late Eocene-Early Oligocene orogenic phase, which caused inversion and uplift in the study area (sector 5), is also dubious as a result of the limited data. To improve the correlations and recognition of the Eocene to Oligocene successions in the area in question (from sector 1 to sector 8), a new stratigraphic interpretation, based on correlated lithostratigraphic columns from different outcrops, is presented. The changes in sedimentation and tectonic events in the study area can be correlated to time-equivalent sea level changes and tectonic uplift in Al Jabal Al Akhdar area, which suggests that the processes causing the sedimento/structural activity are of regional importance.

关键词： Sector 5 Oligocene Inversion Uplift Stratigraphic Correlation

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