Probing the cooperative dynamics varying the side-chain length of poly(alkyl acrylate)s: ESR experiments

Laura Andreozzi (1) , Ciro Autiero (2) , Massimo Faetti (2) , Marco Giordano (2) , Fabio Zulli (2)

1 Physics
2 Physics

The rotational dynamics of the tracer cholestane dissolved in unentangled nearly monodisperse poly(alkyl acrylate) melts has been investigated by means of electron spin resonance spectroscopy. Three samples of almost same molecular weight were selected, poly(methyl acrylate) poly(ethyl acrylate) and poly(n-butyl acrylate), whose linear viscoelastic properties were also characterised. Large temperature intervals were found with power laws relating shear flow relaxation and probe rotational diffusion. The main aim of this paper was the study of the sharp crossover between two different fractional regimes that for all the samples was observed at a temperature Tc=1.15-1.25 Tg. The decoupling from structural relaxation at T

Mots clés: Physical Sciences

Laura Andreozzi, Ciro Autiero, Massimo Faetti, Marco Giordano, Fabio Zulli. Probing the cooperative dynamics varying the side-chain length of poly(alkyl acrylate)s: ESR experiments. Philosophical Magazine, 2007, 87 (3-5), pp.799-810. ⟨10.1080/14786430601003858⟩. ⟨hal-00513777⟩