Pre‐Irradiation Grafting of Styrene into Modified Fluoropolymers

Effect of electron beam on mechanical, thermal, and morphological properties of ethylene methyl acrylate copolymer, grade Elvaloy 1335 has been investigated. The copolymer was subjected to varying doses of electron beam radiation with different proportion of the sensitizer trimethylolpropane trimethacrylate (TMPTMA). It was observed that with increase in electron beam dose, the physicomechanical properties of the crosslinked copolymer improve, reaches an optimum level and subsequently deteriorates. The thermal properties as envisaged from thermogravimetric analysis and differential scanning calorimetric studies revealed stability of the crosslinked irradiated samples over that of the unirradiated ones. The thermal stability was also found to attain the maximum at the same level of radiation and sensitizer. The morphological studies showed consistency with the mechanical properties. Based on the overall study, it may be concluded that ethylene methyl acrylate copolymer with 1 phr TMPTMA at 60 kGy radiation dose is the optimum condition within the range studied in this investigation. V C 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: [75][76][77][78][79][80][81][82][83] 2010

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Engineering properties of electron beam‐crosslinked ethylene methyl acrylate copolymer

Mongal¹,

Chakraborty

Bhattacharyya³

et al. 2010

J of Applied Polymer Sci

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Improvement of compatibility of poly(ethylene terephthalate) and poly(ethylene octene) blends by γ‐irradiation

Yin

Zheng

et al. 2012

J of Applied Polymer Sci

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Blends of poly(ethylene terephthalate) (PET) and poly(ethylene octene) (POE) were prepared by melt blending with various amounts of trimethylolpropane triacylate (TMPTA). The mechanical properties, phase morphologies, and gel fractions at various absorbed doses of c-irradiation have been investigated. It was found that the toughness of blends was enhanced effectively after irradiation as well as the tensile properties. The elongation at break for all studied PET/POE blends (POE being up to 15 wt %) with 2 wt % TMPTA reached 250-400% at most absorbed doses of c-irradiation, approximately 50-80 times of those of untreated PET/POE blends. The impact strength of PET/POE (85/15 wt/wt) blends with 2 wt % TMPTA irradiated with as little as 30 kGy absorbed dose exceeded 17 kJ/m 2 , being approximately 3.4 times of those of untreated blends. The improvement of the mechanical properties was supported by the morphology changes. Scanning electron microscope images of fracture surfaces showed a smaller dispersed phase and more indistinct inter-phase boundaries in the irradiated blends. This indicates increased compatibility of PET and POE in the PET/POE blends. The changes of the morphologies and the enhancement of the mechanical properties were ascribed to the enhanced inter-phase boundaries by the formation of complex graft structures confirmed by the results of the gelation extraction and Fourier Transform Infrared analyses.

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Radiation‐Induced Graft Copolymerization of Styrene into Tetrafluoroethylene‐Hexafluoropropylene‐Vinylidene Fluoride (THV) Terpolymer Films

Lappan

Geißler

Gohs

2011

Macro Materials & Eng

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The objective of this work was to investigate the influence of irradiation conditions on grafting of styrene into tetrafluoroethylene‐hexafluoropropylene‐vinylidene fluoride (THV) terpolymer films. Stress–strain measurements, infrared spectroscopy and electron paramagnetic resonance spectroscopy have been used to characterize the pre‐irradiated polymer films regarding tensile strength, elongation at break, changes in the chemical structure and concentration of trapped radicals, respectively. Main‐chain scissions associated with the formation of carbonyl end groups and end‐chain double bond structures have been identified to be the reason for a moderate deterioration of the mechanical properties of the pre‐irradiated films. The yield of grafting has been found to be influenced by THV grade, irradiation temperature and concentration of cross‐linker. magnified image

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Pre‐Irradiation Grafting of Styrene into Modified Fluoropolymers

Cited by 6 publications

References 27 publications

Engineering properties of electron beam‐crosslinked ethylene methyl acrylate copolymer

Engineering properties of electron beam‐crosslinked ethylene methyl acrylate copolymer

Improvement of compatibility of poly(ethylene terephthalate) and poly(ethylene octene) blends by γ‐irradiation

Radiation‐Induced Graft Copolymerization of Styrene into Tetrafluoroethylene‐Hexafluoropropylene‐Vinylidene Fluoride (THV) Terpolymer Films

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