Block Polymers: Proceedings of the Symposium on Block Polymers at the Meeting of the American Chemical Society in New York City in September 1969S. L. Aggarwal Block polymers represent another milestone in the preparation of polymers of controlled structure. Catalysts and polymerization methods that allowed the preparation of polymers in which the stereo- and geometric isomerism of the monomer units could be con trolled have indeed been among the major developments in polymer science during the last decade. The synthesis of block polymers, in which the sequence length of the comonomer units can be con trolled, portends equally important developments in the science and technology of polymers. The papers collected in this volume cover primarily the pro ceedings of the most recent symposium on block polymers, sponsored by the Division of Polymer Chemistry of the American Chemical Society. It was held in New York City during the Society's 158th National Meeting in September, 1969. Additional contributions from selected authors were invited especially for this book to achieve the most up-to-date account of the advances that have been made since the development of the thermoplastic elastomers that first brought into focus this important area of research. The first two papers in this volume draw attention to the various problems that should be considered in the preparation of block polymers of precisely defined structure from styrene and butadiene or isoprene by anionic polymerization. Characterization of block polymers presents many problems and there is a paucity of systematic work in this area. Attention has been given to the di lute solution properties of block polymers,however, in one of the papers in this volume. |
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Results 1-3 of 46
Page 56
... films cast from 5 % toluene solutions of styrene - isoprene block copolymers varying in compo- sition from 20 to 70 % weight fraction of styrene sequences . higher than 10 % . Change of Domain Structure with Casting Solvent In order to ...
... films cast from 5 % toluene solutions of styrene - isoprene block copolymers varying in compo- sition from 20 to 70 % weight fraction of styrene sequences . higher than 10 % . Change of Domain Structure with Casting Solvent In order to ...
Page 57
... cast from n - hexane Fig . 2. Electron micrographs of ultrathin sections about 350 Å thick , cut normal to the surface of films cast from 2.5 % solutions of 40/60 styrene - isoprene block copolymer in various solvents . The domain ...
... cast from n - hexane Fig . 2. Electron micrographs of ultrathin sections about 350 Å thick , cut normal to the surface of films cast from 2.5 % solutions of 40/60 styrene - isoprene block copolymer in various solvents . The domain ...
Page 173
... Films cast from nitromethane Films cast from ethylbenzene b ) c ) Weight fraction of PEO in copolymer which is crys- talline X 100 , i.e. , wt . crystalline PEO / total PEO X 100 . same composition but copolymer # 33 is a tri ...
... Films cast from nitromethane Films cast from ethylbenzene b ) c ) Weight fraction of PEO in copolymer which is crys- talline X 100 , i.e. , wt . crystalline PEO / total PEO X 100 . same composition but copolymer # 33 is a tri ...
Contents
Problems in the Synthesis of Block Polymers | 1 |
Experimental | 11 |
Small Angle XRay Scattering Studies of TriBlock | 19 |
Copyright | |
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Common terms and phrases
A-B type block a-MST anionic annealing BCMO behavior benzene BG copolymers block copolymers BPAC butadiene carbanions catalyst Chem chemical colloidal component composition concentration copolymerization crystalline crystallization curves decrease diene domain structure elastomers electron micrographs ethylene oxide experimental Figure films cast formation fraction glass transition graft copolymers hard segments heat homopolymers increase initiation interactions isoprene Kraton lamellae lithium living ends matrix mechanical melting point micelle mixtures modulus mole molecular weight monomer morphology observed osmium tetroxide parameters particles phase separation phenyl ether plastic poly poly-THF polybutadiene polycarbonate polyisoprene Polymer Sci polymerization polystyrene polystyrene domains prepared properties PS-PEO reaction rubber samples scattering shear rate Skoulios sodium solubility solution solvent specimens spherical spherulitic strain stress stress-strain studies styrene styrene content styrene-butadiene styrene-isoprene subchains sulfide Table tensile strength thermal Thermolastic Tobolsky toluene transition temperature triblock type block copolymer urethane values viscosity x-ray