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izvor podataka: crosbi

Relaxations and chain dynamics of sequential full interpenetrating polymer networks based on natural rubber and poly(methyl methacrylate) (CROSBI ID 210447)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

John, Jacob ; Klepac, Damir ; Petković Didović, Mirna ; Raju, K.V.S.N. ; Pius, Anitha ; Andreis, Mladen ; Valić, Srećko ; Thomas, Sabu Relaxations and chain dynamics of sequential full interpenetrating polymer networks based on natural rubber and poly(methyl methacrylate) // Polymer international, 63 (2014), 8; 1427-1438. doi: 10.1002/pi.4634

Podaci o odgovornosti

John, Jacob ; Klepac, Damir ; Petković Didović, Mirna ; Raju, K.V.S.N. ; Pius, Anitha ; Andreis, Mladen ; Valić, Srećko ; Thomas, Sabu

engleski

Relaxations and chain dynamics of sequential full interpenetrating polymer networks based on natural rubber and poly(methyl methacrylate)

The relaxations of natural rubber (NR)/poly(methyl methacrylate) (PMMA) interpenetrating polymer networks (IPNs) were studied using dynamic mechanical analysis, electron spin resonance (ESR) and solid state NMR spectroscopy. Samples with a lower concentration of PMMA in IPNs (25 wt%) showed only one relaxation, which corresponds to NR with a slight shift to higher temperature. IPNs with 35 wt% of PMMA showed very broad transitions arising from β- and α-relaxations in PMMA, with the β-relaxation slightly shifted to lower temperature. These compositions also showed a higher modulus at all temperatures. Highly phase separated IPNs showed a complete drop of modulus at 423 K. Higher crosslinking in the NR phase increases the miscibility and decreases the temperature difference between transitions, while in PMMA it increases the phase separation and does not affect the β-relaxation of the PMMA chains. The ESR results showed that PMMA chains located in the PMMA-rich and NR-rich domains have different motional characteristics. The strong interaction between PMMA and NR chains was also observed by carbonyl relaxation in solid state NMR spectra. It was found that medium level crosslinking is needed for better interpenetration between phases.

chain dynamics; electron spin resonance (ESR); spin probe; interpenetrating polymer networks; dynamic mechanical analysis

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Podaci o izdanju

63 (8)

2014.

1427-1438

objavljeno

0959-8103

10.1002/pi.4634

Povezanost rada

Kemija

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