Synthesis and Morphology of Model PS-b-PDMS Copolymers

MARIO D. NINAGO; ÁNGEL J SATTI; ANDRÉS E. CIOLINO; ENRIQUE M. VALLÉS; MARCELO A. VILLAR; DANIEL A. VEGA; ALEJANDRO SANZ; AURORA NOGALES; DANIEL R. RUEDA

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

JOHN WILEY & SONS INC

Año: 2010 vol. 48 p. 3119 - 3127

0887-624X

PDMS copolymers were synthesized by using sequential addition of monomers and anionic polymerization (high-vacuum techniques), employing the most recent experimental procedures that allow the controlled polymerization of each monomer in order to obtain blocks with controlled molar masses. Diblock copolymers obtained were analyzed by using different techniques, such as SEC, H?NMR, FTIR, SAXS, and WAXS. The PS?b?PDMS copolymers obtained showed narrow molar mass distribution, and variable PDMS content, ranging from 2 up to 55 wt%. Compacted powder samples were investigated by SAXS to reveal their structure and morphology changes upon thermal treatment in the interval from 30 °C to 200 ºC. The sample with the highest PDMS content exhibits a lamellar morphology while two other samples show hexagonally packed cylinders of PDMS in a PS matrix. For the lowest PDMS content samples, the SAXS pattern corresponds to a disordered morphology and did not show any changes upon thermal treatment. Detailed information about the morphology of scattering domains was obtained by fitting the SAXS scattering curves.