Influence of the network on the interaction parameter in system EPDM vulcanizate–solvent

✍ Scribed by Z. Hrnjak-Murgić; J. Jelenčić; M. Bravar; M. Marović

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 210 KB
• Volume: 65
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970801)65:5<991::aid-app17>3.0.co;2-v

✦ Synopsis

Swelling measurements in six organic solvents were carried out on samples of dicumyl peroxide crosslinked ethylene-propylene-diene (EPDM) having various crosslink densities. The Flory-Huggins interaction parameter x was determined for EPDM vulcanizates 312 and 812 as well as their mixture 312/812 using the Flory-Rehner equation. The results show that the x parameter for the crosslinked polymer is greater than for the uncrosslinked one and is a linear function of the crosslink density. The swelling behavior of the networks were also interpreted by the Flory-Erman theory using the structural factor F 4 to characterize the network and its behavior during the swelling. The obtained x values indicate that broadening of the molecular mass distribution, in the Gaussian region of distribution, mixture 312/812, increases interactions with solvents.