Thermal degradation studies of electron beam cured ethylene-vinyl acetate copolymer

Dutta, Sujit; Bhowmick, Anil K.; Mukunda, P. G.; Chaki, T. K.

doi:10.1016/0141-3910(95)00125-6

Cited by 75 publications

(46 citation statements)

References 7 publications

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“…On further increase in 12Me-MMT loading, the hybrids show a decreasing trend towards their initial thermal decomposition temperature. A two-step weight loss of EVA-12 25 and its hybrids is observed because of two-step decompositions. The first step corresponds to the deacetylation reaction while second one is associated with the formation of transvinylenes accompanied by the main chain scission.…”

Section: Resultsmentioning

confidence: 99%

EVA/clay nanocomposite by solution blending: Effect of aluminosilicate layers on mechanical and thermal properties

et al. 2003

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Ethylene vinyl acetate (EVA)/clay nanocomposites were synthesized by blending a solution of ethylene vinyl acetate copolymer containing 12% vinyl acetate abbreviated as EVA-12 in toluene and dispersion of dodecyl ammonium ion intercalated montmorillonite (12Me-MMT) in N,N-dimethyl acetamide (DMAc). X-ray patterns of sodium montmorillonite (Na + -MMT) and 12Me-MMT exhibited d 001 peak at 2θ = 7.4 o and 2θ = 5.6 o respectively; that is, the interlayer spacing of MMT increased by about 0.39 nm due to intercalation of dodecyl ammonium ions. The XRD trace of EVA showed no peak in the angular range of 3-10 o (2θ). In the XRD patterns of EVA/clay hybrids with clay content up to 6 wt% the basal reflection peak of 12Me-MMT was absent, leading to the formation of delaminated configuration of the composites. When the 12Me-MMT content was 8 wt% in the EVA-12 matrix, the hybrid revealed a peak at about 2θ = 5.6 o , owing to the aggregation of aluminosilicate layers. Transmission electron microscopic photograph exhibited that an average size of 12-15 nm clay layers were randomly and homogeneously dispersed in the polymer matrix, which led to the formation of nanocomposite with delaminated configuration. The formation of delaminated nanocomposites was manifested through the enhancement of mechanical properties and thermal stability, e.g. tensile strength of an hybrid containing only 2 wt% 12Me-MMT was enhanced by about 36% as compared with neat EVA-12.

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Section: Resultsmentioning

confidence: 99%

EVA/clay nanocomposite by solution blending: Effect of aluminosilicate layers on mechanical and thermal properties

et al. 2003

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“…Non-irradiated TPGDA on the other hand, recorded lowest degradation temperature of T5% and T10% due to evaporation of unreacted liquid TPGDA. Upon irradiation a small increment in Figure 6.12 Typical TGA curve of a) RTR/TMPTA and b) RTR/TPGDA at different irradiation doses the degradation temperature was observed in EVA/TPGDA composition (Dutta et al, 1995). However, irradiation leads to decrease in the degradation temperatures of EVA/HVA2.…”

Section: Tga Analysismentioning

confidence: 99%

Improving the properties of reclaimed waste tire rubber by blending with poly(ethylene‐co‐vinyl acetate) and electron beam irradiation

Ramarad

Ratnam

Khalid

et al. 2014

J of Applied Polymer Sci

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Non-degradable waste tire generation around the world is growing at an alarming rate. Diversifying the recycling route of these waste tires is essential to solve the problem. One way is to incorporate them into polymers and convert them into new products. However, incorporation of ground tire rubber into thermoplastics has been hampered due to lack of toughness and adhesion between phases. To address the issue, this study utilized reclaimed waste tire rubber (RTR) instead; and evaluated the properties of RTR and poly(ethyleneco-vinyl acetate) (EVA) blends. The properties of the RTR/EVA blends were further enhanced by compatibilization and electron beam irradiation.Processing, mechanical, thermal and dynamic mechanical properties of RTR were tremendously improved by blending with EVA. However, the interfacial adhesion was found to lack in the blends. Compatibilization by reactive, physical and combination strategies were explored utilizing (3-Aminopropyl)triethoxy silane (APS), liquid styrene butadiene rubber (LR) and maleated EVA (MAEVA), respectively. APS and MAEVA were found to be the most and least favourable compatibilizer, respectively. Apart from functioning as reactive compatibilizer, APS also reclaimed the RTR phase further. These lead to improved dispersion of smaller RTR phase in EVA matrix and enhanced the interfacial adhesion.Electron beam irradiation revealed the presence of radical stabilizing and scavenging additives within RTR which retards the crosslinking process in RTR and RTR/EVA blends. Though chain scissions were predominant; study showed the replacement of S-S and S-C bonds with stronger and stiffer C-C bonds ensures the retention of RTR and RTR/EVA blends properties upon irradiation.Compatibilization of RTR/EVA blend by APS (50RTR/5APS) also improved the crosslinking efficiency. However, the blend still suffered from oxidative degradation from irradiation in air. Radiation sensitizers, trimethylol propane triacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA) and N,N-1,3Phenylene Bismaleimide (HVA2), were used to accelerate the irradiation induced crosslinking in RTR and 50RTR/5APS blends. Presence of radiation sensitizers leads to simultaneous improvement in toughness and tensile strength of RTR and 50RTR/5APS blends. Elastic capacity of RTR phase was restored and interfacial adhesion enhanced in the presence of radiation sensitizers.iii

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“…Their properties depend on the VA content: products ranging from 2 to 40% VA are marketed for different purposes. An extensive bibliography [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] is available on the degradation of EVA and the estimated kinetic parameters of the process. Basically, the thermal degradation of EVA copolymers is a two-step process.…”

Section: Introductionmentioning

confidence: 99%

Coupled DTA–TGA–FT-IR investigation of pyrolytic decomposition of EVA, PVC and cellulose

Soudais

Moga

Blaz̆ek

et al. 2007

Journal of Analytical and Applied Pyrolysis

115

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The behavior of individual polymers (EVA, PS, PVC and cellulose) was investigated under pyrolysis at different heating rates. A kinetic model is proposed for the weight loss and compared with the experimental results and the kinetic parameters were determined and compared with the available published data. IR spectrometric analysis was used to follow the evolution of the gaseous pyrolysis products versus the temperature. Analysis of online FT-IR spectra confirmed the initial loss of acetic acid for EVA and one HCl for PVC. #

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Thermal degradation studies of electron beam cured ethylene-vinyl acetate copolymer

Cited by 75 publications

References 7 publications

EVA/clay nanocomposite by solution blending: Effect of aluminosilicate layers on mechanical and thermal properties

EVA/clay nanocomposite by solution blending: Effect of aluminosilicate layers on mechanical and thermal properties

Improving the properties of reclaimed waste tire rubber by blending with poly(ethylene‐co‐vinyl acetate) and electron beam irradiation

Coupled DTA–TGA–FT-IR investigation of pyrolytic decomposition of EVA, PVC and cellulose

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