Block Polymers: Proceedings of the Symposium on Block by Maurice Morton (auth.), S. L. Aggarwal (eds.)

By Maurice Morton (auth.), S. L. Aggarwal (eds.)

Block polymers characterize one other milestone within the practise of polymers of managed constitution. Catalysts and polymerization tools that allowed the practise of polymers during which the stereo- and geometric isomerism of the monomer devices can be con­ trolled have certainly been one of the significant advancements in polymer technological know-how over the last decade. The synthesis of block polymers, during which the series size of the comonomer devices will be con­ trolled, portends both vital advancements within the technology and know-how of polymers. The papers accumulated during this quantity hide basically the professional­ ceedings of the latest symposium on block polymers, backed through the department of Polymer Chemistry of the yank Chemical Society. It used to be held in manhattan urban in the course of the Society's 158th nationwide assembly in September, 1969. extra contributions from chosen authors have been invited in particular for this e-book to accomplish the main updated account of the advances which were made because the improvement of the thermoplastic elastomers that first introduced into concentration this significant quarter of study. the 1st papers during this quantity draw consciousness to many of the difficulties that are meant to be thought of within the training of block polymers of accurately outlined constitution from styrene and butadiene or isoprene through anionic polymerization. Characterization of block polymers offers many difficulties and there's a paucity of systematic paintings during this quarter. realization has been given to the di­ lute resolution homes of block polymers,however, in a single of the papers during this volume.

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The generator was the ultra-stable Philips Model PW 1310. The exposure time for each scattering angle varied. For scattering angles four 0-1000 sec readings were taken every 20 sec of arc. Counting times were. 100 sec. At scattering angles greater than 1000 sec the intensity was so low (~3c/s) that counting times of 25 minutes were required for each point. [9] The camera can routinely allow scattering to be measured within 20 sec of the incident beam. RESULTS Solvent Effects A sample of tri-block polymer, polystyrene-polybutadiene-polystyrene of approximately 40% styrene and of molecular weight 21,100 - 63,400 - 21,100 was cast as a film from different solvents, then dried.

Ikeda and M. L. Wallach, Polymer, £, 141 (1965). MULTIPLE GLASS TRANSITIONS OF BLOCK POLYMERS 51 3. W. H. StockJna¥er, L. D. Moore, M. Fixman and B. N. Epstein, J. , 16, 517 (1955). 4. W. Bushuk and H. Benoit, Can. J. , 32, 1616 (1958); M. Ieng and H. BenOit, J. Chim. , ~ 479 (1961). 5. K. H. , 190, 16 (1963). 6. S. Strella, J. Appl. , L 569 (1963). 7. J. H. Gibbs and E. A. DiMarzio, J. Chem. , 28, 373 (1958). STUDIES ON DOMAIN FORMATION MECHANISM OF A-B TYPE BLOCK COPOLYMER FROM ITS SOLUTION * T.

112°C5 82 168 I 3 5 7 9 EXTENSION RATIO Fig. 3. STRESS-STRAIN CURVES OF ANNEALED SAMPLES 36 G. A. HARPELL AND C. ~. WILKES scattering can be accounted for by the increase in effective path length. If the sample consisted of lamellae normal to the surface, a sharp decrease in intensity would be observed as ¢ is increased or decreased from J2f = O. The data suggests that this system contains rodlike polystyrene domains with their long axes parallel to the mill direction. An alternative interpretation is that the domains are lamellar, parallel to the milling direction, but randomly oriented with respect to the sample surface.

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