Influence of the chemical structure on the kinetics of the structural relaxation process of acrylate and methacrylate polymer networks

Salmerón-Sánchez, M. , Touzé, Y., Saiter, A., Saiter, J.M. and Gómez Ribelles, J.L. (2005) Influence of the chemical structure on the kinetics of the structural relaxation process of acrylate and methacrylate polymer networks. Colloid and Polymer Science, 283(7), pp. 711-720. (doi:10.1007/s00396-004-1207-z)

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Abstract

The enthalpy relaxation of poly(hydroxyethyl methacrylate) (PHEMA), poly(ethyl methacrylate) (PEMA) and poly(ethyl acrylate) (PEA) networks, obtained by DSC, are compared. The temperature interval of the glass transition broadens in the sequence PEA-PEMA-PHEMA. The plots of the enthalpy loss during the annealing for 200 min at different temperatures below T g show that the structural relaxation process also takes place in PHEMA in a broader temperature interval than in PEA or PEMA. The modelling of the structural relaxation process using a phenomenological model allows determining the temperature dependence of the relaxation times concluding that the fragility in PHEMA is significantly lower than in PEMA. Both features are ascribed to the connectivity of the polymer chains in PHEMA via hydrogen bonding. The role of the presence of the methyl group bonded to the main chain is analysed by comparing the results obtained in PEA and PEMA.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Salmeron-Sanchez, Professor Manuel
Authors: Salmerón-Sánchez, M., Touzé, Y., Saiter, A., Saiter, J.M., and Gómez Ribelles, J.L.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Colloid and Polymer Science
ISSN:0303-402X
ISSN (Online):1435-1536
Published Online:20 October 2004

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