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Hegazy, El‐Sayed A.; El‐Rehim, Hassan A. Abd; Ali, Abbas M.; Nowier, H. G.; Aly, H. F.

doi:10.1023/a:1022898926567

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…The melting point of these crystallites may be limited by the presence of branches, since smaller crystallites usually melt at lower temperatures than larger crystallites. The presence of branches will reduce the melting temperature of the polymers [28].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Controlling degradation of low-molecular-weight natural polymer “dextrin” using gamma irradiation

Lotfy

2009

International Journal of Biological Macromolecules

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Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Controlling degradation of low-molecular-weight natural polymer “dextrin” using gamma irradiation

Lotfy

2009

International Journal of Biological Macromolecules

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“…There has been increasing interest in the synthesis of new hydrogels for various applications, such as super water absorbents, sensors, separation membranes, and drug delivery systems in medicine and pharmacy 1–6. Hydrogels based on polyacrylamide (PAAm) are blood‐compatible biomaterials that find applications in the coatings of catheters and controlled release devices.…”

Section: Introductionmentioning

confidence: 99%

Characterization of hydrogels prepared by the γ irradiation of aqueous solutions of acrylamide and N‐vinyl‐2‐pyrrolidone comonomers

Alla

Kandeel

El‐Naggar

2007

J of Applied Polymer Sci

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Copolymer hydrogels were prepared through the γ irradiation of aqueous solutions composed of different ratios of acrylamide (AAm) and vinyl pyrrolidone (VP) monomers. The chemical structure, thermal stability, and structural morphology of the hydrogels were characterized with Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy, respectively. The IR spectroscopy analysis showed the formation of copolymerization and the presence of hydrogen bonding. The TGA study showed that the AAm/VP‐based hydrogels possessed higher thermal stability than polyacrylamide (PAAm). However, the thermal stability of the AAm/VP hydrogels increased with an increasing ratio of the VP component. The study of the swelling kinetics in water showed that all the hydrogels reached the equilibrium state after 24 h. However, the AAm/VP‐based hydrogels showed swelling in water that was lower than that of the hydrogel based on pure AAm. Meanwhile, the degree of swelling of the AAm/VP‐based hydrogels decreased with an increasing ratio of VP in the feeding solutions. The results showed that the PAAm and AAm/VP‐based hydrogels prepared at 50 kGy were affected by a change in the temperature around 25°C, whereas the hydrogels prepared at 25 kGy did not show this characteristic. However, the hydrogels prepared at different doses displayed reversible pH character. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

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“…Radiation-grafted membranes have gained much importance in recent years because of their wide range of applications [1][2][3][4] and ease of synthesis. 5 Fluoropolymers have been mainly used to synthesize these membranes as they are thermally and mechanically stable.…”

Section: Introductionmentioning

confidence: 99%

Proton‐exchange membranes via the grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer by a preirradiation technique. IV. Dynamic mechanical analysis, X‐ray diffraction, and scanning electron microscopy studies of grafted and sulfonated membranes

Phadnis

Patri

Chakraborty

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:The grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer was carried out by a preirradiation technique. The resulting membranes were sulfonated with concentrated sulfuric acid. The effects of the degree of grafting and sulfonation on the structure of the membranes were studied by X-ray diffraction and scanning electron microscopy. The crystallinity percentage decreased with increasing grafting. Scanning electron microscopy studies confirmed that grafting took place by a front mechanism, by which grafting started at the surface and slowly proceeded inwards. The dynamic mechanical properties of the membranes and their sulfonated derivatives were also investigated. The storage modulus at room temperature increased with grafting and increased further with sulfonation.

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Untitled

Cited by 10 publications

References 7 publications

Controlling degradation of low-molecular-weight natural polymer “dextrin” using gamma irradiation

Controlling degradation of low-molecular-weight natural polymer “dextrin” using gamma irradiation

Characterization of hydrogels prepared by the γ irradiation of aqueous solutions of acrylamide and N‐vinyl‐2‐pyrrolidone comonomers

Proton‐exchange membranes via the grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer by a preirradiation technique. IV. Dynamic mechanical analysis, X‐ray diffraction, and scanning electron microscopy studies of grafted and sulfonated membranes

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