Abstract
The technique employed in the investigations reported in this review emphasizes postponing the formation of anisotropic domains in semi-flexible polymers so as to better orient them along a common director. Most of the materials investigated were prepared by the following sequence of steps:
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(i)
Identifying polymer chains of sufficient stiffness to give liquid-crystalline, anisotropic phases (either homopolymers, or block copolymers consisting of stiff and flexible sequences)
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(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
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(iii)
Deforming the swollen network uniaxially or biaxially to induce segmental orientation
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(iv)
Removing the solvent, at constant length or at constant force, in the hope of causing a first-order transition to a single-phase, homogeneous, and highly-ordered material.1–15
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Mark, J.E. (1995). Improved Mechanical Properties of Polymer Films Dried from the Swollen State in Uniaxial and Biaxial States of Strain. In: Prasad, P.N., Mark, J.E., Fai, T.J. (eds) Polymers and Other Advanced Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0502-4_18
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