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- W119585910 abstract "Abstract The materials being investigated are prepared by the following sequence of steps: (i) identifying polymer chains of sufficient stiffness to give liquid-crystalline, anisotropic phases (either homopolymers, or block copolymers consisting of stiff and flexible sequences), (ii) cross linking the chains, in the presence of solvent, thus conferring sufficient solidity for the polymer to remain in a deformed state for any length of time, with the solvent preventing the premature ordering of the stiff chains or sequences, (iii) deforming the swollen network uniaxially or biaxially to induce segmental orientation, and (iv) removing the solvent, at constant length or at constant force, causing a first-order transition, and thus yielding a single-phase , homogeneous, and highly-ordered material. Although the cellulosics, starch derivatives and poly(γ-benzyl-L-glutamate) are of particular interest because of their biodegradability, experiments are also being carried out on Kevlar®, poly( n -alkyl isocyanates), poly(benzobisoxazoles), and poly(benzobisthiazoles). In the case of high-temperature polymers, this method would represent an alternative to high-temperature heat treatments, which have some disadvantages. In the case of less stable polymers, such as the cellulosics, it would be the only way to achieve this uniform ordering, and would thus represent a uniquely new processing technique." @default.
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- W119585910 date "1992-01-01" @default.
- W119585910 modified "2023-09-27" @default.
- W119585910 title "Novel orientation techniques for the preparation of high-performance materials from semi-flexible polymers such as the cellulosics" @default.
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- W119585910 doi "https://doi.org/10.1016/b978-0-444-89397-0.50016-6" @default.
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