Electron beam irradiation of ethylene‐propylene terpolymer: Evaluation of trimethylol propane trimethacrylate as a crosslink promoter

Abstract

ABSTRACT:The effect of electron beam irradiation on ethylene-propylene terpolymer (EPDM) was investigated. A 50-part oil-extended EPDM with high termonomer (ENB) content (iodine number of base polymer) 19, was selected for this study. An increase in irradiation dose from 0 to 200 kGy resulted in increased crosslinking, measured by an increase in gel contents and better swelling resistance. The effect of the multifunctional monomer trimethylol propane trimethacrylate (TMPTMA) as a crosslink promoter was studied using IR spectroscopy. The IR studies revealed enhanced peak absorbances at 1725, 1257, and 1023 cm Ϫ1 as a result of the increased concentration of C ϭ O and C-O-C groups and reduced absorbance at 1630 cm Ϫ1 due decreased concentration of C ϭ C groups with TMPTMA level in the irradiated samples. The presence of TMPTMA increased the level of crosslinking at a given irradiation dose, which was manifested by improvement in tensile properties. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 968 -975, 2005

Aspects Regarding Radiation Crosslinking of Elastomers

“…Variables such as radiation dosage and the effect of polymer microstructure and chemical additives on the efficiency of electron beam cure have been studied. Some researchers (Zaharescu et al, 2000;Chowdhury & Banerji, 2005) studied radiation-induced crosslinking in thermoplastic elastomers based on ethylene-propylene rubber (EPDM) and polyethylene (PE) or polypropylene (PP) plastics.…”

Kinetic modeling of the peroxide cross-linking of polymer/monomer blends: From a theoretical model framework to its application for a complex polymer/monomer dispersion system

“…The transition state search for specific reactions was performed using quadratic synchronous transit algorithm [35] with root-mean-square gradient of 0.00418 kJ/ (nm  mol) as the terminal condition. The reactivity ratios of the Table 4 Specific reaction scheme and the associated rate constants considered in kinetic model for HPAB/DCP/ZDMA compounds [38][39][40][41][42][43][44][45][46].…”

“…Furthermore, M E0 may subsequently be calculated analogously to M P0 and M C0 . Kinetic parameters for specific monomer/polymer chemistry (ZDMA, TMPTMA, HVA-2) ( Table 4) were either obtained directly from literature [38], determined from literature data [39][40][41][42][43][44][45][46], or molecular modeling was applied as well.…”

The Mechanical Properties of Ethylene-Vinyl-Acetate Copolymer/Triallylcyanurate Mixture Cross-linked by Electron Beam and Microwave Processing

“…S-au studiat variabile precum doza de radiaþii, efectul microstructurii polimerului ºi aditivilor chimici asupra eficienþei tratamentului cu fascicul de electroni. Unii cercetãtori [4,5] au studiat reticularea indusã de radiaþii la elastomerii termoplastici pe bazã de cauciuc EPDM ºi polietilenã (PE) sau materiale plastice din polipropilenã (PP).…”

“…Variables such as radiation dosage and the effect of polymer microstructure and chemical additives on the efficiency of electron beam cure have been studied. Some researchers [4,5] studied radiation-induced cross-linking in thermoplastic elastomers based on ethylene-propylene rubber (EPDM) and polyethylene (PE) or polypropylene (PP) plastics.…”