TY - JOUR
T1 - Networks of gel-forming triblock copolymer solutions: In situ SANS and rheological measurements
AU - Mortensen, K.
AU - Almdal, K.
AU - Kleppinger, R.
AU - Mischenko, N.
AU - Reynaers, H.
PY - 1998
Y1 - 1998
N2 - Triblock copolymers in a solvent, selective for their middle blocks provide the basis for the formation of novel physical networks where cross-links are formed by self-assembled domains of the end-blocks. Triblock copolymers of poly(styrene)-poly(ethylene,butylene)-poly(styrene) (SEBS) dissolved in a mixture of aliphatic and alicyclic compounds constitute such a network system. Using a Rheometrics RSA-2 instrument modified for in situ measurements of small-angle neutron scattering and rheology provides a unique possibility far detailed understanding thermodynamics of such a gel. The self-association of the PS-blocks do not only promote formation of highly inter-connected end-block domains, but within a narrow temperature range these domains furthermore constitute a network with body-centered cubic (BCC) microstructure. Upon large amplitude oscillating shear the polycrystalline soft gel can be aligned into a twinned BCC monodomain. (C) 1998 Elsevier Science B.V. All rights reserved.
AB - Triblock copolymers in a solvent, selective for their middle blocks provide the basis for the formation of novel physical networks where cross-links are formed by self-assembled domains of the end-blocks. Triblock copolymers of poly(styrene)-poly(ethylene,butylene)-poly(styrene) (SEBS) dissolved in a mixture of aliphatic and alicyclic compounds constitute such a network system. Using a Rheometrics RSA-2 instrument modified for in situ measurements of small-angle neutron scattering and rheology provides a unique possibility far detailed understanding thermodynamics of such a gel. The self-association of the PS-blocks do not only promote formation of highly inter-connected end-block domains, but within a narrow temperature range these domains furthermore constitute a network with body-centered cubic (BCC) microstructure. Upon large amplitude oscillating shear the polycrystalline soft gel can be aligned into a twinned BCC monodomain. (C) 1998 Elsevier Science B.V. All rights reserved.
KW - Nye funktionelle materialer
U2 - 10.1016/S0921-4526(97)00784-9
DO - 10.1016/S0921-4526(97)00784-9
M3 - Journal article
SN - 0921-4526
VL - 241-243
SP - 1025
EP - 1028
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -