SEC with UV and ELSD detection for analysis of gamma-irradiated PS-radiation-grafted P(VDF/HFP) films |
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Authors: | C Aymes-Chodur N Yagoubi N Betz A Le Moël D Ferrier |
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Institution: | (1) Centre d’études Pharmaceutiques, Laboratoire de Chimie Analytique, 5 rue J. B. Clément, 92296 Chatenay-Malabry, France;(2) CEA Saclay, DSM/DRECAM/SRSIM, 91191 Gif-sur-Yvette Cedex, France |
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Abstract: | Summary Thin poly(vinylidene fluoride/hexafluoropropylene) (P(VDF/HFP)) films ahve been irradiated with gammarays to induce the initiation
of styrene grafting by the indirect method. To obtain a better understanding of the radiation-grafting process we have used
size exclusion chromatography (SEC) to study the effect of irradiation of this polymer and the evolution of the molecular
weights of the polystyrene (PS) grafted chains as a function of the grafting time. Pristine, irradiated and PS radiation-grafted
samples have been compared. We present evidence that the gamma irradiation induces both scission and crosslinking of the P(VDF/HFP)
chains. We show that the average molecular weights of the PS grafted chains increase with grafting time and that the asymmetry
of the chromatographic peak increases also. These grafted chains have molecular weights much higher than those of pristine
P(VDF/HFP) and they cannot be confused with PS homopolymer chains, which have higher molecular weights as both, pristine and
radiation-grafted P (VDF/HFP). Reversed-phase high-performance liquid chromatography (RPHPLC) has shown the absence of additives
in pristine P(VDF/HFP) and has provided evidence of the presence of oligomers. |
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Keywords: | Column liquid chromatography Size-exclusion chromatography Fluoropolymers Evaporative light-scattering detection (ELSD) Radiation grafting |
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