Tailoring of electrical and optical properties of (PVA (₁-x)-PEG (x) ) blends by addition nanoparticle fillers / Yassmen Yehia Yehia Hafez ; Supervised Mohammed Amin Soliman , Gamal Abdelnaser Madbouly Nasr , Emad Sayed Mousa

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Yassmen Yehia Yehia Hafez

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TextLanguage: English Publication details: Cairo : Yassmen Yehia Yehia Hafez , 2021Description: 93 P. : charts ; 25cmOther title:

باضافة مالئات نانومترية (PVA (₁-x)-PEG (x) )تفصيل الخواص الكهربية والضوئية لخليط من مبلمرى [Added title page title]

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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Physics Summary: This present work concerns with transparent films of polyvinyl alcohol/polyethylene glycol (PVA/PEG) blend loaded with different nano-silica (SiO₂ ) content which were prepared by using solution casting.Therefore, the influence of PEG loading on PVA/PEG blends was first discussed in an attempt to obtain samples with good physical properties to be used for further studies.In addition, PVA/PEG nanocomposites (suitable blend ratio) were prepared using silica nanoparticles to elucidate its influence on the dielectric as well as optical properties and its thermal stability. Finally, we studied the effect of SiO₂ nanoparticle loading on the optical properties of samples.In this work two relevant parts were discussed:The first one: deals with the thermal gravimetric analysis and dielectric properties of the blends PEG/PVA prepared with different concentration ratios.Different onset temperatures of degradation and char formation were detected and the dielectric properties of PEG/PVA blends were measured as a function of frequency and PEG contents. While, Part two: concerns with thermogravimetric analysis of (90 PVA/10 PEG) blend loaded with different concentration of SiO₂ and the dielectric properties of SiO₂ nanoparticles dispersed in PVA/PEG polymer matrix at room temperature and as a function of both silica loading and frequency. Finally, the optical properties of PVA/PEG composites will be elucidated

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Thesis	قاعة الرسائل الجامعية - الدور الاول	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.12.20.M.Sc.2021.Ya.T (Browse shelf(Opens below))		Not for loan	01010110085316000
CD - Rom	مخـــزن الرســائل الجـــامعية - البدروم	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.12.20.M.Sc.2021.Ya.T (Browse shelf(Opens below))	85316.CD	Not for loan	01020110085316000

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Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Physics

This present work concerns with transparent films of polyvinyl alcohol/polyethylene glycol (PVA/PEG) blend loaded with different nano-silica (SiO₂ ) content which were prepared by using solution casting.Therefore, the influence of PEG loading on PVA/PEG blends was first discussed in an attempt to obtain samples with good physical properties to be used for further studies.In addition, PVA/PEG nanocomposites (suitable blend ratio) were prepared using silica nanoparticles to elucidate its influence on the dielectric as well as optical properties and its thermal stability. Finally, we studied the effect of SiO₂ nanoparticle loading on the optical properties of samples.In this work two relevant parts were discussed:The first one: deals with the thermal gravimetric analysis and dielectric properties of the blends PEG/PVA prepared with different concentration ratios.Different onset temperatures of degradation and char formation were detected and the dielectric properties of PEG/PVA blends were measured as a function of frequency and PEG contents. While, Part two: concerns with thermogravimetric analysis of (90 PVA/10 PEG) blend loaded with different concentration of SiO₂ and the dielectric properties of SiO₂ nanoparticles dispersed in PVA/PEG polymer matrix at room temperature and as a function of both silica loading and frequency. Finally, the optical properties of PVA/PEG composites will be elucidated

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