Lyotropic block copolymers of poly(p-benzamide) and poly[2-phenylene (5-benzimidazole)]: The ternary system copolymer/poly(p-benzamide)/dimethylacetarnide—lithium chloride

Conio, G.; Bisbano, S.; Marsano, Enrico; Tealdi, A.; Bianchi, E.

doi:10.1016/s0032-3861(97)00541-7

Cited by 2 publications

(2 citation statements)

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“…From a technological standpoint, there is a great deal of interest in mixed systems including a rigid and a flexible polymer as a way to produce composite materials based on ultrahigh modulus polymers. , However, it is difficult to get a heterogeneous composite with a fine dispersion of the components due to the limited miscibility of the rigid rods and coiled polymers. The use of block copolymers instead of rigid rods has been shown to be a promising approach toward overcoming this difficulty. − The equilibria of the helix−coil type are not unlike the case of alternating rigid−flexible block copolymers. Qualitatively, it is not surprising as the helix−coil sequence can be described in terms of a rigid−flexible sequence.…”

Section: Discussionmentioning

confidence: 99%

“…The use of block copolymers instead of rigid rods has been shown to be a promising approach toward overcoming this difficulty. [23][24][25] The equilibria of the helix-coil type are not unlike the case of alternating rigid-flexible block copolymers. Qualitatively, it is not surprising as the helix-coil sequence can be described in terms of a rigid-flexible sequence.…”

Section: Discussionmentioning

confidence: 99%

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Phase Behavior of Ternary Systems Involving a Conformationally Variable Chain and a Randomly Coiled Polymer

Lin

Liu

et al. 2003

Macromolecules

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Ternary systems consisting of a conformationally variable chain capable of assuming either a rodlike helix or a random coil conformation, a randomly coiled polymer, and a solvent were treated according to the lattice model proposed by Flory. The partition function has been derived in consideration of the Flory−Matheson expression related to the free energy contribution from the chain conformation changes. A marked increase of the miscible isotropic zone was predicted when the chain rigidity of the conformationally variable polymer in the isotropic phase is reduced. The conformationally variable chain tends to adopt a rodlike form as long as it enters the anisotropic phase in which the randomly coiled polymer is essentially excluded. The influence of various molecular structure parameters, solvent−polymer interaction, and temperature was also studied.

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