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Advisor(s)
Abstract(s)
In the last few years, atom transfer radical polymerization (ATRP) of acrylate and methacrylate monomers
in the presence of a small amount of cross-linker has been investigated in order to produce branched
polymers and gels with applications in microelectronics, coatings industries or biomedicine (Wang
and Zhu, 2005; Gao et al., 2007). In this context, it is being explored the production by ATRP of
branched/crosslinked polymers with a lower degree of heterogeneity than that obtained by conventional
free radical polymerization (FRP). This work reports an experimental study on the ATRP of
methyl methacrylate (MMA) + ethylene glycol dimethacrylate (EGDMA) initiated by MBPA (methyl
-bromophenylacetate) and mediated by copper bromide (CuBr) ligated with HMTETA (1,1,4,7,10,10-
hexamethyltriethylenetetramine). The synthesized copolymers were analyzed by size exclusion chromatography
(SEC) with simultaneous detection of refractive index (RI) and multi-angle laser light scattering
(MALLS) signals. Important details of the molecular architecture of these materials can therefore
be measured, namely absolute molecular weights and z-average radius of gyration. Different experimental
runs were performed in order to investigate the influence of the operating conditions (e.g. temperature
and initial molar ratios MMA/EGDMA/MBPA/CuBr/HMTETA) on the structure of the products.
Description
Keywords
Branching Crosslinking Atom-transfer Molecular weight Radius of gyration
Citation
Trigo, Ivone; Gonçalves, Miguel; Dias, Rolando; Costa, Mário (2008). SEC/MALLS measurement of the branched structure of methyl methacrylate + ethylene glycol dimethacrylate copolymers synthesized by atom transfer radical polymerization. In 10th International Chemical and Biological Engineering Conference - CHEMPOR. Braga. p.102-107. ISBN 978-972-97810-3-2
Publisher
Universidade do Minho