Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 27: POSTER Polymer Physics and Materials
CPP 27.42: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Side chain crystallization in random copolymers containing octadecylmethacrylate — •E. Hempel1, H. Budde2,3, C. Schicktanz4, S. Höring2, and M. Beiner1 — 1FB Physik und — 2FB Chemie, Universität Halle, D-06099 Halle/Saale — 3Fraunhofer Pilotanlagenzentrum für Polymersynthese und -verarbeitung Schkopau, D-06258 Schkopau — 4FB INW, Fachhochschule Merseburg, D-06217 Merseburg
The crystallization behavior of two series of random copolymers, poly(styrene-stat-octadecylmethacrylate) [P(S-stat-ODMA)] and poly(methylmethacrylate-stat-octadecylmethacrylate) [P(MMA-stat-ODMA)], has been studied by DSC and scattering techniques. Interestingly, side chain crystallization occurs in all copolymers containing more than 25mol% ODMA while only a single glass transition is observed for lower ODMA contents. This indicates that the alkyl groups of different ODMA units can aggregate and form small crystals if the ODMA content is large enough. Isothermal crystallization experiments show that the crystallization kinetics slows down and that the transformation interval broadens if the ODMA content decreases. The crystallization temperature Tc for samples containing 25mol% ODMA is 40K reduced as compared to values for PODMA homopolymers. This can be interpreted as a consequence of crystallization occurring in isolated ODMA compartments which must be nucleated separately. Scattering data measured during the isothermal crystallization process of P(S-stat-ODMA) copolymers are included in the discussion. The results for random copolymers are compared with the findings for PODMA homopolymers as well as P(S-block-ODMA) block copolymers.