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EFFECT OF MOLECULAR ARCHITECTURE ON DBS-INDUCED BLOCK COPOLYMER GELS: A RHEOLOGICAL STUDY
Citation:
Nunez*, C M., K. Whitfield*, D. J. Mercurio, J. R. Ilzhoefer, R. J. Spontak, AND S. A. Khan. EFFECT OF MOLECULAR ARCHITECTURE ON DBS-INDUCED BLOCK COPOLYMER GELS: A RHEOLOGICAL STUDY. MACROMOLECULAR SYMPOSIA 106:275-286, (1996).
Description:
Dibenzylidene sorbitol (DBS) is capable of gelling a variety of organic solvents and polymeric materials by forming a rigid, 3-D hydrogen-bonded network. In this work, two poly(siloxane)/poly(propylene oxide) segmented copolymers of equal composition and molecular weight, but different architectures (endblocked vs. pendant), as well as a pure poly(propylene oxide), have been gelled with DBS. We have investigated the dynamic rheological properties of these gels to ascertain the effect of copolymer architecture, PDMS commoner and DBS concentration on network formation.