Structure and dynamics in poly(L-lactide) copolymer networks |
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Authors: | Roser Sabater i Serra Apostolos Kyritsis Jorge L Escobar Ivirico Andreu Andrio Balado Jose Luis Gómez Ribelles Polykarpos Pissis Manuel Salmerón-Sánchez |
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Institution: | 1. Centro de Biomateriales e Ingeniería Tisular, Universidad Politécnica de Valencia, Camí de Vera, 14, 46022, Valencia, Spain 2. Department of Physics, National Technical University of Athens, Zografou Campus, 15780, Athens, Greece 4. CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia, Spain 3. Departament de Física, Universitat Jaume I, 12071, Castelló, Spain 5. Centro de Investigación Príncipe Felipe, Autopista del Saler 16, 46013, Valencia, Spain
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Abstract: | Poly(L-lactide) networks (PmLA) hydrophilized with different amounts of 2-hydroxyethyl acrylate (HEA) were investigated by
dielectric relaxation spectroscopy, thermally stimulated depolarization currents, and differential scanning calorimetry. The
incorporation of HEA units in the PmLA network, with the aim of modulating the water sorption capacity of the system, results
in a material with a complex behavior. The system consists of phase-separated microdomains richer in one or the other comonomers
that constitute the network. Initially, the addition of smalls amount of HEA units in the network gives rise to a one-phase,
two-component system; however, when the amount of HEA in the system increases, a new phase (HEA-rich one) is formed containing
some mLA chains that modify the main relaxation mode of these domains and the local dynamics of the system. The structure
of the system has been analyzed by comparing the relaxational modes in the PmLA and PHEA homonetworks with those in the copolymer
networks. |
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