By Maurice Morton (auth.), S. L. Aggarwal (eds.)
Block polymers signify one other milestone within the guidance of polymers of managed constitution. Catalysts and polymerization tools that allowed the coaching of polymers within 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 might be con trolled, portends both very important advancements within the technological know-how and expertise of polymers. The papers accrued during this quantity disguise basically the professional ceedings of the latest symposium on block polymers, subsidized by way of the department of Polymer Chemistry of the yank Chemical Society. It used to be held in long island urban through the Society's 158th nationwide assembly in September, 1969. extra contributions from chosen authors have been invited in particular for this booklet to accomplish the main up to date account of the advances which have been made because the improvement of the thermoplastic elastomers that first introduced into concentration this crucial quarter of analysis. the 1st papers during this quantity draw consciousness to a few of the difficulties that are supposed to be thought of within the practise of block polymers of accurately outlined constitution from styrene and butadiene or isoprene via anionic polymerization. Characterization of block polymers offers many difficulties and there's a paucity of systematic paintings during this region. 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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Extra resources for Block Polymers: Proceedings of the Symposium on Block Polymers at the Meeting of the American Chemical Society in New York City in September 1969
A. HARP ELL AND C. E. WILKES temperatures. This is clearly shown in Fig. 3. Stress-strain data in Table 1 show that if the mold temperature is held constant (either at 112 or l68°C) both the modulus at an extension ratio of 8 and the interdomain distance decrease with molding time, while extensibility increases. Similar results are obtained if the mold time is held constant and the mold temperature is increased. Good annealing conditions promote the expulsion of occluded polybutadiene from the polystyrene domains.
Heating the sa:mples above the T g of polystyrene freed the polybutadiene trapped in the polystyrene do:mains. We feel that the attain:ment of the :more nearly rando:m-coil configuration by the polybutadiene chains (relieving the stress) was acco:mpanied by so:me :move:ment of the polystyrene do:mains. They :must have been pulled in closer together and better aligned at this ti:me. Although the annealings were done in a constant volu:me :mold, :most of the reorganization occurred during the 30 seconds the sa:mples were held at the particular te:mperature before pressure was applied.
A. HARPELL AND C. E. 1 0 DIFFRACTION ANGLE 28(°) Fig. I. 2b. PARTIAL FIGURE ABOUT c/> AXIS. S'am Ie 5. Samp'le Mold Time Mold Temp.. 300 - I 18 Min. 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.