Reaction kinetics of graft copolymerization and thermochemical studies of the degradation of poly(vinyl alcohol) graft copolymer

Aggour, Yassin A.

doi:10.1002/pi.635

Cited by 11 publications

(13 citation statements)

References 22 publications

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“…Furthermore, the increase in VCMP content facilitates the formation of PS macroradicals, which in turn decrease the GE. Similar observations have previously been reported for some copolymers 21–24…”

Section: Resultssupporting

confidence: 92%

Modification of polystyrene properties through grafting with N‐vinylcarboxamido‐2‐methylpropane sulfonic acid monomer

Aggour

2004

Polymer International

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Polystyrene (PS) possesses good mechanical properties, but its surface is relatively inert and hydrophobic. Grafting of N‐vinylcarboxamido‐2‐methylpropane sulfonic acid (VCMP) is useful to hydrophilize the PS surface. Grafting was performed using benzoyl peroxide (BPO) as an initiator in toluene:methanol solvent mixture (3:1 volume ratio). The influence of the main factors on grafting, such as temperature, time, concentrations of initiator, PS and VCMP, has been studied. The results show that the initial rate of polymerization and percentage of grafting are enhanced by increased temperature. Furthermore, the specific rate constants of the first order reaction/are determined, and the activation energy of the grafting reaction is estimated. The grafting parameters are established and a suitable mechanism of the reaction is proposed. The grafted PS is to characterized through infrared spectra, intrinsic viscosity, thermogravimetric analysis (TGA) and differential gravimetric analysis (DTG). The kinetics of thermal degradation and the order of the thermal stabilities are given. Also the decomposition activation energies of the thermal degradation are determined, and confirm the thermal stabilities of the polymers used. © 2004 Society of Chemical Industry

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Section: Resultssupporting

confidence: 92%

Modification of polystyrene properties through grafting with N‐vinylcarboxamido‐2‐methylpropane sulfonic acid monomer

Aggour

2004

Polymer International

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“…The increase in monomer concentration would be expected to increase both the percentage of grafting and the molecular weight of grafting copolymer (Abdel Razik, 1997;Aggour, 2001). Indeed, the results presented in Fig.…”

Section: Effect Of Monomer Concentrationmentioning

confidence: 83%

Studies on graft copolymerization of 3-acrylamidopropyl trimethylammonium chloride on pullulan

Constantin¹,

Mihalcea²,

Oanea³

et al. 2011

Carbohydrate Polymers

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“…Similarly, Kumar et al [20] and Chen et al [21] have also used enzyme as a catalyst for grafting purposes. Previously, Aggour, [22] has also observed the similar phenomenon with an increase in the grafting percentage due to the increase in monomer concentration, which in turn also intensify the molecular weight of the grafted composite.…”

Section: Structural and Elemental Evaluation (Ft-ir)mentioning

confidence: 58%

Poly(3-hydroxybutyrate)-ethyl cellulose based bio-composites with novel characteristics for infection free wound healing application

Iqbal

Kyazze

Locke

et al. 2015

International Journal of Biological Macromolecules

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A series of bio-composites including poly3-hydroxybutyrate [P(3HB)] grafted ethyl cellulose (EC) stated as P(3HB)-EC were successfully synthesised. Furthermore, natural phenols e.g., p-4-hydroxybenzoic acid (HBA) and ferulic acid (FA) were grafted onto the newly developed P(3HB)-EC-based bio-composites under laccase-assisted environment without the use of additional initiators or crosslinking agents. The phenol grafted bio-composites were critically evaluated for their antibacterial and biocompatibility features as well as their degradability in soil. In particular, the results of the antibacterial evaluation for the newly developed bio-composites indicated that 20HBA-g-P(3HB)-EC and 15FA-g-P(3HB)-EC bio-composites exerted strong bactericidal and bacteriostatic activity against Gram(-)E. coli NTCT 10418 as compared to the Gram(+)B. subtilis NCTC 3610. This study shows further that at various phenolic concentrations the newly synthesised bio-composites remained cytocompatible with human keratinocyte-like HaCaT skin cells, as 100% cell viability was recorded, in vitro. As for the degradation, an increase in the degradation rate was recorded during the soil burial analyses over a period of 42 days. These findings suggest that the reported bio-composites have great potential for use in wound healing; covering the affected skin area which may favour tissue repair over shorter periods.

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Reaction kinetics of graft copolymerization and thermochemical studies of the degradation of poly(vinyl alcohol) graft copolymer

Cited by 11 publications

References 22 publications

Modification of polystyrene properties through grafting with N‐vinylcarboxamido‐2‐methylpropane sulfonic acid monomer

Modification of polystyrene properties through grafting with N‐vinylcarboxamido‐2‐methylpropane sulfonic acid monomer

Studies on graft copolymerization of 3-acrylamidopropyl trimethylammonium chloride on pullulan

Poly(3-hydroxybutyrate)-ethyl cellulose based bio-composites with novel characteristics for infection free wound healing application

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