Colloidal and Morphological Behavior of Block and Graft by M. Matsuo, S. Sagaye (auth.), Gunther E. Molau (eds.)

By M. Matsuo, S. Sagaye (auth.), Gunther E. Molau (eds.)

The molecules of block and graft copolymers are molecules of a better order; they include homopolymer subchains that are interconnected by means of chemical valence bonds. This structural com­ plexity is manifested within the strange habit of block and graft copolymers either in answer and in bulk. many varieties of interac­ tions are attainable in block and graft copolymers within the sturdy country. Polymer subchains of 1 molecule can engage with different polymer subchains which can belong to a similar molecule or to diversified molecules. given that polymer chains of chemically assorted composition tend to be incompatible, thermodynamically destructive in addition to thermodynamically favorable interactions exist within the sturdy kingdom. In recommendations of block and graft copolymers, the sit down­ uation turns into much more complicated, simply because interactions among the solvent molecules and a few of the subchains of the copolymer mole­ cules ensue as well as the interactions among the polymer chains. This multitude of interactions supplies upward push to a large spec­ trum of colloidal and morphological houses that have no paral­ lel in much less advanced polymer structures corresponding to homopolymers or random copolymers. learn at the colloidal and morphological habit of block and graft copolymers is a comparatively new box of undertaking. It all started in 1954, whilst F. M. Merrett fractionated combinations of grafted na­ tural rubber with the corresponding homopolymers and saw that colloidal sols have been shaped at yes issues in the course of his fractional precipitations.

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Extra info for Colloidal and Morphological Behavior of Block and Graft Copolymers: Proceedings of an American Chemical Society Symposium held at Chicago, Illinois, September 13–18, 1970

Sample text

More strictly speaking, it must be arised from the long-range correlation of the spherical domains dispersed in the matrix (15). Anisotropy in the long-range correlation, which may be generated by the stretching, would give a change of the circular A-type pattern to an elliptical pattern, whose major axis is perpendicular to the stretching direction, in a range of almost the same scattering angles' as those of the A-type pattern. (16) This may be realized by the case of hi-20, the third series in Fig.

For this series, the volume fraction of the spherical domain is kept constant but the average diameter of the spherical domains is changed systematically to become larger in the order from Co 75 through Co 10. , the composition changes in fraction of the block copolymer from 75 to 10 wt% but the ratio of total styrene sequences to total isoprene sequences is identical with that of the copolymer, 73/27 (11). Fig. 3 shows electron micrographs of ultrathin sections of a series of ABS latices embedded in a mixture of polybutadiene and agar-agar and stained by Os04' The series of ABS latices was made by a particular grafting technique in emulsion system of polybutadiene latices dispersed in a medium containing styrene and acrylonitrile monomers so that the grafting occurs mostly onto the surface of the latices, not within the latices, and that the degree of grafting varies from 20 through 80 wt% for the series.

The incident beam was well-collimated, polarized to the vertical direction by using a polarization rotator, Model 3l0'oSpectra Physics Inc. and monochlomatized at wavelength of 6328 A. l by scanning with a photo-tube in a horizontal plane and rotating the specimen around its film normal, respectively. The analyser was placed just before the photo-tube so that its polarization direction can be rotatable within a plane perpendicular to the scattered ray at a given e and that any combination of polarization condition, such as V and H polarization condition was mainly used because of veryVweak ~ scattering being probably due to smallness of the local anisotropy of the system.

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