Colloidal and Morphological Behavior of Block and Graft Copolymers: Proceedings of an American Chemical Society Symposium Held at Chicago, Illinois, September 13–18, 1970Gunther E. Molau The molecules of block and graft copolymers are molecules of a higher order; they consist of homopolymer subchains which are interconnected by chemical valence bonds. This structural com plexity is manifested in the unusual behavior of block and graft copolymers both in solution and in bulk. Many types of interac tions are possible in block and graft copolymers in the solid state. Polymer subchains of one molecule can interact with other polymer subchains which may belong to the same molecule or to different molecules. Since polymer chains of chemically different composition are usually incompatible, thermodynamically unfavorable as well as thermodynamically favorable interactions exist in the solid state. In solutions of block and graft copolymers, the sit uation becomes even more complex, because interactions between the solvent molecules and the various subchains of the copolymer mole cules occur in addition to the interactions between the polymer chains. This multitude of interactions gives rise to a wide spec trum of colloidal and morphological properties which have no paral lel in less complex polymer systems such as homopolymers or random copolymers. Research on the colloidal and morphological behavior of block and graft copolymers is a relatively new field of endeavor. It started in 1954, when F. M. Merrett fractionated mixtures of grafted na tural rubber with the corresponding homopolymers and observed that colloidal sols were formed at certain points during his fractional precipitations. |
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Page 64
... segments are A = polystyrene and B = polydimethylsiloxane , and both segments possess narrow molecular weight distributions . 7 RESULTS AND DISCUSSION ABA block copolymers can be unambiguously prepared by the controlled sequential ...
... segments are A = polystyrene and B = polydimethylsiloxane , and both segments possess narrow molecular weight distributions . 7 RESULTS AND DISCUSSION ABA block copolymers can be unambiguously prepared by the controlled sequential ...
Page 67
... segments , for example copolymer 24A has values of M , and M of 37,500 and 121,800 respectively , whereas the values based on composition are 25,000 and 121,000 . The broadening of the PS segments arose from the rapid polymerisation of ...
... segments , for example copolymer 24A has values of M , and M of 37,500 and 121,800 respectively , whereas the values based on composition are 25,000 and 121,000 . The broadening of the PS segments arose from the rapid polymerisation of ...
Page 169
... segments in the soft domains are ex- tended and straightened out , but large - scale motion is impossible since each prepolymer segment is constrained by two hard domains . At higher strain levels the soft segments become taut so that ...
... segments in the soft domains are ex- tended and straightened out , but large - scale motion is impossible since each prepolymer segment is constrained by two hard domains . At higher strain levels the soft segments become taut so that ...
Contents
MicromorphologyProperty Relationships in Graft | 1 |
The Effect of Environment on the Morphology of Styrene | 21 |
Light Scattering from TwoPhase Polymer System having | 33 |
Copyright | |
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Colloidal and Morphological Behavior of Block and Graft Copolymers ... Gunther Molau Limited preview - 2012 |
Colloidal and Morphological Behavior of Block and Graft Copolymers ... Gunther Molau No preview available - 1971 |
Colloidal and Morphological Behavior of Block and Graft Copolymers ... Gunther Molau No preview available - 2012 |
Common terms and phrases
acid copolymer acrylic acid adsorbed adsorption behavior benzene Benzene Cast block and graft block copolymer block samples Chem coils colloidal component composition concentration containing crosslinks crystallites curve cyclohexane density dimethylsiloxane blocks diphenylsiloxane blocks dispersed elastomers electron micrographs emulsions equation Figure fraction gels graft copolymers homopolymer impact strength increase interactions intrinsic viscosity ionomer ionomer blends isotherms Kraton lipid matrix melt flow membrane microphase separation mixture MMA homopolymer modulus molecular weight molecules morphology observed ORIENTATION FUNCTION p-XY peroxide phase separation plastic plot PMMA PMMA-PST-PMMA PMST polar poly polybutadiene polydimethylsiloxane polyethylene Polymer Sci polymerization polystyrene polystyrene block Potassium Acrylate properties proteins random copolymers ratio reaction region S/MMA block segments shown shows silver oxide solubility parameter solution solvent specimens spherical domains strain styrene subchains surface Table temperature tensile Thermolastic 125 toluene triblock copolymers ultrathin sections values versus