TY - JOUR
T1 - Nanoporous materials from stable and metastable structures of 1,2-PB-b-PDMS block copolymers
AU - Schulte, Lars
AU - Grydgaard, Anne
AU - Jakobsen, Mathilde R.
AU - Szewczykowski, Piotr Przemyslaw
AU - Guo, Fengxiao
AU - Vigild, Martin Etchells
AU - Berg, Rolf Henrik
AU - Ndoni, Sokol
PY - 2011
Y1 - 2011
N2 - Experimental procedures used at the preparation and characterization stages of nanoporous materials (NPM) from 1,2-polybutadiene-b-polydimethylsiloxane (1,2-PB-b-PDMS) block copolymers are presented. The NPM were obtained from self-assembled block copolymers after firstly cross-linking 1,2-PB (the matrix component) and secondly degrading PDMS (the expendable component). Depending on the temperature of the cross-linking reaction different morphologies can be ‘frozen’ from the same block copolymer. Starting with a block copolymer precursor of lamellar morphology at room temperature, the gyroid structure or a metastable structure showing hexagonal symmetry (probably HPL) were permanently captured by cross-linking the precursor at 140 °C or at 85 °C, respectively. PDMS was degraded by reaction with tetrabutylamonium fluoride; considerations on the mechanism of cleaving reaction are presented. The characterization of the materials at different stages of preparation includes gravimetry, infrared spectroscopy, small angle x-ray scattering, electron microscopy and isothermal nitrogen adsorption experiments.
AB - Experimental procedures used at the preparation and characterization stages of nanoporous materials (NPM) from 1,2-polybutadiene-b-polydimethylsiloxane (1,2-PB-b-PDMS) block copolymers are presented. The NPM were obtained from self-assembled block copolymers after firstly cross-linking 1,2-PB (the matrix component) and secondly degrading PDMS (the expendable component). Depending on the temperature of the cross-linking reaction different morphologies can be ‘frozen’ from the same block copolymer. Starting with a block copolymer precursor of lamellar morphology at room temperature, the gyroid structure or a metastable structure showing hexagonal symmetry (probably HPL) were permanently captured by cross-linking the precursor at 140 °C or at 85 °C, respectively. PDMS was degraded by reaction with tetrabutylamonium fluoride; considerations on the mechanism of cleaving reaction are presented. The characterization of the materials at different stages of preparation includes gravimetry, infrared spectroscopy, small angle x-ray scattering, electron microscopy and isothermal nitrogen adsorption experiments.
KW - 1,2-Polybutadiene
KW - Block copolymer
KW - Nanoporous
U2 - 10.1016/j.polymer.2010.11.038
DO - 10.1016/j.polymer.2010.11.038
M3 - Journal article
SN - 0032-3861
VL - 52
SP - 422
EP - 429
JO - Polymer
JF - Polymer
IS - 2
ER -