Thermal stability of gamma irradiated ethylene-propylene-diene monomer/divinyl benzene systems

2005 ◽  
Vol 87 (1) ◽  
pp. 11-16 ◽  
Author(s):  
T. Zaharescu ◽  
E. Feraru ◽  
C. Podină
Keyword(s):  
Thermal Stability ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Divinyl Benzene ◽  
Gamma Irradiated ◽  
Thermal Stability Of

Thermal Stability of Gamma Irradiated Low Density Polyethylene Films Containing Hindered Amine Stabilizers

2004 ◽  
Vol 289 (6) ◽  
pp. 524-530 ◽  
Author(s):  
Traian Zaharescu ◽  
Mustapha Kaci ◽  
Ghania Hebal ◽  
Radu Setnescu ◽  
Tanta Setnescu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Films ◽  
Gamma Irradiated ◽  
Thermal Stability Of

Enhancing the physico-mechanical properties of ethylene propylene diene monomer rubber via ץ-radiation in the presence of bi-functional and tri-functional monomers

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Mai M. El-Zayat ◽  
Maysa A. Mohamed ◽  
Eslam Aboelezz
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Irradiation Dose ◽  
Crosslinking Density ◽  
High Dose ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Gel Content ◽  
Oil Resistance ◽  
Bifunctional Monomer

Abstract This study, uses two polyfunctional monomers (PFMs) namely ethylene glycol dimethacrylate (EGDMA) as a bifunctional monomer and trimethylolpropane triacrylate (TMPTA) as a trifunctional monomer were used as co-agents in irradiation crosslinking of Ethylene Propylene Diene Monomer Rubber (EPDM). The effect of concentration of each PFM and irradiation dose on the crosslinking density, gel content, swelling behavior in motor and brake oils, in addition to the mechanical and thermal stability properties of EPDM was investigated in detailed. The results showed a remarkable increase in the gel content, crosslinking density and mechanical properties as the concentration of PFMs increased from 1 to 5 phr (parts per hundred parts of rubber). The various blends of EPDM with the trifunctional monomer express the highest gel content and crosslinking density than those with the bifunctional monomer. The addition of 5 phr of TMPTA to EPDM causes a dramatic improvement in tensile strength (TS) of the prepared blend reached to 188% compared to neat EPDM at 50 kGy. At the same time, the maximum TS of the blend containing 5 phr of EGDMA achieved only 41% compared to neat EPDM at an irradiation dose of 100 kGy. The swelling of irradiated samples in brake oil revealed a stronger oil resistance than motor oil. For all irradiated samples, the oil uptake decreased with the irradiation dose up to 100 kGy. The EPDM samples containing 5 phr of TMPTA recorded the highest oil resistance at 100 kGy. The results also showed that the addition of PFMs and irradiation treatment of the various prepared blends improved the thermal stability of EPDM. Finally, neat EPDM and the blends containing 1 and 3 phr of EGDMA can be used as radiation dosimeters in the very high dose range (50–200 kGy).

scholarly journals Improved Self-Supporting and Ceramifiable Properties of Ceramifiable EPDM Composites by Adding Aramid Fiber

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1523
Author(s):  
Dong Zhao ◽  
Wei Liu ◽  
Yucai Shen ◽  
Guodong Jiang ◽  
Tingwei Wang
Keyword(s):  
Thermal Stability ◽  
Aramid Fiber ◽  
Thermal Shrinkage ◽  
Network Structures ◽  
Ethylene Propylene Diene Monomer ◽  
Solvent Resistance ◽  
Fiber Network ◽  
Higher Temperature ◽  
Thermal Stability Of ◽  
Scanning Electron

Ceramifiable ethylene propylene diene monomer (EPDM) composites with fiber network structures were prepared by using aramid fiber (AF), ammonium polyphosphate (APP), and silicate glass frits (SGF). The effect of AF on the curing characteristic of the ceramifiable EPDM composites was studied. The morphology of AF in the composites system was observed by optical microscopy (OM) and scanning electron microscope (SEM). The effects of the observed AF network structures on the solvent resistance, mechanical properties, ablative resistance, self-supporting property, and ceramifiable properties of the composites were investigated. Results suggested that the existence of the AF network structure improved the vulcanization properties, solvent resistance, thermal stability, and ablative resistance of the EPDM composites. An excellent self-supporting property of the EPDM composites was obtained by combining the formation of the AF network and the formation of crystalline phases at higher temperature (above 600 °C). The thermal shrinkage performance of AF and the increased thermal stability of the EPDM composites improved the ceramifiable properties of the EPDM composites.

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