Electron beam initiated modification of ethylene vinyl acetate using trimethylolpropane trimethacrylate

Datta, Somenath; Bhowmick, Anil K.; Chaki, T. K.; Majali, A.B.; Despande, R.S.

doi:10.1016/0032-3861(96)81598-9

Cited by 47 publications

(26 citation statements)

References 5 publications

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“…There are several effective methods of crosslinking polymer, including irradiation crosslinking, [1][2][3][4] peroxide crosslinking, [5][6][7][8][9][10][11] and silane-moisture crosslinking. [12][13][14][15][16][17][18][19] In the present study, peroxide crosslinking and silane-moisture crosslinking are of interest.…”

Section: Introductionmentioning

confidence: 99%

Comparison in processability and mechanical and thermal properties of ethylene–octene copolymer crosslinked by different techniques

Sirisinha

Meksawat

2004

J of Applied Polymer Sci

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ABSTRACT:The crosslinking of metallocene ethyleneoctene copolymer was investigated. The crosslinked polymers were prepared using two different techniques, i.e., peroxide crosslinking and silane-water crosslinking. In the former, the crosslinking reaction was conducted in a twinscrew extruder, in the presence of dicumylperoxide. In the latter, the polymer was first grafted with vinyl trimethoxysilane in the extruder and subsequently crosslinked with water. The paper aims at investigation of the differences between these two techniques, in terms of processing and product mechanical and thermal properties. The results showed that the silane-crosslinked polymers could be prepared with much higher gel contents than the peroxidecrosslinked samples. The silane-crosslinked polymers also retained the elastomeric characteristics of the pure polymer and showed remarkably higher extensibility, better thermal stability, and energy storage capacity. An explanation for the property differences between peroxide-crosslinked and silane-crosslinked polymers was proposed.

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Section: Introductionmentioning

confidence: 99%

Comparison in processability and mechanical and thermal properties of ethylene–octene copolymer crosslinked by different techniques

Sirisinha

Meksawat

2004

J of Applied Polymer Sci

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“…17,18,22 At the same time, an increase in the tensile modulus due to polymer branching/crosslinking was observed, with the highest value for partially crosslinked sample 7.…”

Section: Thermal Thermomechanical and Tensile Properties Of Modifiementioning

confidence: 81%

Modification of isotactic polypropylene by the free‐radical grafting of 1,1,1‐trimethylolpropane trimethacrylate

Mousavi-Saghandikolaei

Frounchi

Dadbin

et al. 2007

J of Applied Polymer Sci

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The chemical modification of isotactic polypropylene was performed by the free-radical-promoted grafting of 1,1,1-trimethylolpropane trimethacrylate (TMPTMA) in the presence of dicumyl peroxide (DCP) as the initiator. The reaction was carried out both in a batch internal mixer and in a corotating twin-screw extruder; the effects of the peroxide and monomer concentrations on the extent of modification in terms of the grafting efficiency and polymer chain structure variations were investigated. The modified samples were characterized with Fourier transform infrared to determine the structure of the grafted groups and the degree of functionalization, with gel permeation chromatography and the melt flow index to evaluate changes in the molecular weight, and with differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis to measure the final thermal properties. In addition, solvent extrac-tion with xylene was performed to highlight the presence of gel and its extent. The structure of the grafted groups was determined, and the number of grafted groups was quantitatively evaluated. The degree of functionalization increased with an increasing TMPTMA/DCP molar ratio. Thermal analysis results hinted at the presence of grafted chains with an increased percentage of TMPTMA. Although degradation reactions predominated at high amounts of peroxide, grafting and branching processes became competitive at high levels of TMPTMA. The balance between competing b-scission and grafting/branching reactions could be adjusted on the basis of feed conditions. 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 950-958, 2007

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“…Also, EVA can easily form free radicals at lower radiation doses compared to PE. 23,26 Mechanical Properties Figure 2 depicts the stress-strain properties of a 50 : 50 PE and EVA blend irradiated at different radiation doses. The tensile properties of the blend irradiated at different radiation doses are given in Table II.…”

Section: Gel-fraction Analysismentioning

confidence: 99%

“…It may be pointed out that the tensile strength of pure PE and EVA passes through a maximal at an intermediate radiation dose while the elongation at break decreases with increase in the radiation dose. [21][22][23] To understand the modulus and strength of the electron-beam crosslinked PE/EVA blend, the same parameters were calculated theoretically using an approach similar to that of Takayanagi et al 28 and assuming a two-phase material combining series and parallel elements. Since the LDPE used in this study has a high MFI (low viscosity at mixing temperature), the parallelmodel upper bound was considered as follows: These are shown in Figure 3.…”

Section: Gel-fraction Analysismentioning

confidence: 99%

“…20 The effects of electron-beam radiation on the structures and properties of polyethylene (PE) and ethylene-vinyl acetate (EVA) in the presence of different types of polyfunctional monomers have also been reported. [21][22][23] The influence of electron-beam irradiation on the mechanical properties of polypropylene-EPDM rubber blends was studied by Harnischfeger et al 24 Martinez-Padro et al 25 carried out gamma radiation-induced crosslinking of PE and EVA blends. Possible chemical reactions and alternative irradiation methods were also discussed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of new thermoplastic elastomers from blends of polyethylene and ethylene-vinyl acetate copolymer by electron-beam technology

Chattopadhyay

Chaki

Bhowmick

2001

J. Appl. Polym. Sci.

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Electron beam initiated modification of ethylene vinyl acetate using trimethylolpropane trimethacrylate

Cited by 47 publications

References 5 publications

Comparison in processability and mechanical and thermal properties of ethylene–octene copolymer crosslinked by different techniques

Comparison in processability and mechanical and thermal properties of ethylene–octene copolymer crosslinked by different techniques

Modification of isotactic polypropylene by the free‐radical grafting of 1,1,1‐trimethylolpropane trimethacrylate

Development of new thermoplastic elastomers from blends of polyethylene and ethylene-vinyl acetate copolymer by electron-beam technology

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