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 14
... structure was again observed . SBS - 5 showed neither rod nor sheet structure but very short rod structure as demonstrated in Fig . 12. These results are attributed to the poor solubility of the B component in MEK . All the structures ...
... structure was again observed . SBS - 5 showed neither rod nor sheet structure but very short rod structure as demonstrated in Fig . 12. These results are attributed to the poor solubility of the B component in MEK . All the structures ...
Page 16
... structures of styrene - diene block copolymers , the part of which has been discussed in this paper . The peculiar structure of piled network formation in SBS - 1 cast from cyclo- hexane solution can be considered as a modification of ...
... structures of styrene - diene block copolymers , the part of which has been discussed in this paper . The peculiar structure of piled network formation in SBS - 1 cast from cyclo- hexane solution can be considered as a modification of ...
Page 23
... structures appear to be in the process of forming spheres of polybutadiene . The film structure can be altered in a predictable manner by the addition of selective solvents . Cyclohexane , a selective solvent for polybutadiene , was ...
... structures appear to be in the process of forming spheres of polybutadiene . The film structure can be altered in a predictable manner by the addition of selective solvents . Cyclohexane , a selective solvent for polybutadiene , was ...
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