Les polymères organisés

Sadron, Charles

doi:10.1351/pac196204020347

Cited by 59 publications

(13 citation statements)

References 22 publications

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“…Different routes have been used to obtain liquid-crystalline polymers. One basic idea was to take a molecular group, which has a tendency to form liquid-crystalline phases (herein called an "mesogenic group"), attach it to a reactive group and perform the polymerization [7,14,151. Cases are known, where the monomers exhibit liquid-crystalline phases.…”

Section: Polymers With Liquid-crystalline Structuresmentioning

confidence: 99%

Structure and morphology of liquid‐crystalline polymers

Wendorff

Finkelmann

Ringsdorf

1978

J. polym. sci., C Polym. symp.

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Liquid‐crystalline phases are characterized by structures intermediate between a three‐dimensionally ordered crystal and a disordered fluid. Polymers with liquid‐crystalline structures can be obtained from specific monomers containing mesogenic groups with a tendency to form liquid‐crystalline phases. These mesogenic groups are either incorporated into the main chain or attached to a chain as side groups. In both cases liquid‐crystalline structures, and also enantiotropic liquid‐crystalline phases, have been reported. Smectic polymers are characterized by layered structures with long‐range order in the direction of the layer normal and two‐dimensional short‐range order within the layers. The nematic polymers are characterized by a preferred direction on a microscopic scale and short‐range positional order of the centers of mass of the mesogenic groups. Thermal and textural properties are similar to the corresponding properties of low molecular weight liquid crystals.

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Section: Polymers With Liquid-crystalline Structuresmentioning

confidence: 99%

Structure and morphology of liquid‐crystalline polymers

Wendorff

Finkelmann

Ringsdorf

1978

J. polym. sci., C Polym. symp.

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“…The mesomorphic phases of block polymers were first recognized and studied by Prof. Sadron and his coworkers in the course of their pioneering investigations of block polymers of styrene and ethylene oxide (44). It was suggested that the crystallization of ethylene oxide blocks is essential for the development of such phases, but eventually it was shown that mesomorphic phases are formed virtually with all block-polymer systems, e.g., in {styrene) {butadiene) system where both blocks form amorphous phases (45).…”

Section: Polymer Engineeringmentioning

confidence: 99%

Block and graft polymers their synthesis, especially by living polymer technique, and their properties

Szwarc

1973

Polymer Engineering & Sci

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The various structures encountered in block and graft polymers are reviewed and a nomenclature useful for the description of these macromolecules is proposed. The concept of living polymers is elucidated and its ramifications discussed. It is shown how greatly the control of polymerization and the uniformity of the products is improved when living polymers are used as the reagents. Their application in the synthesis of block and graft polymers is illustrated by numerous examples. Other synthetic techniques yielding block and graft polymers are briefly sketched, their advantages and shortcomings being considered. Properties of block and graft polymers are described, special attention being devoted to the problems of mesomorphic phases and to the morphology of block polymers. The incompatibility phenomena observed in block and graft polymer systems are compared with those encountered in studies of the polymeric blends. Finally, the present and future applications of block and graft polymers are considered and their potential evaluated.

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“…It is well known that this process takes place at very low polymer concentrations. Below the critical micellar concentration (cmc), the insoluble block of the polymer chain collapses to form so‐called monomolecular micelles 1. Above the cmc, the soluble blocks remain in the outer part of the micelles, which is usually referred to as the corona or shell.…”

Section: Introductionmentioning

confidence: 99%