Molecular weight characteristics of poly-p-benzamide

Iovleva, M. M.; Prozorova, G.Ye.; Papkov, S. P.

doi:10.1016/0032-3950(78)90166-1

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…2. Amounts of isolated rigid aromatic residues and long elements (25). presented as 70 pbenzamide residues, plotted against mole % p-aminobenzoic acid in the feedstock.…”

Section: Aharonimentioning

confidence: 99%

Rigid backbone polymers. XVI. Random copolyamides

Aharoni

1980

J. Appl. Polym. Sci.

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SynopsisSeveral homologous families of random copolyamides containing aromatic rigid elements and aliphatic or aralkyl flexible elements were prepared and characterized. Lyotropic liquid crystallinity was observed in all such polymers where over 50% of the aromatic residues belonged to rigid elements whose axial ratio surpassed a critical value of 5 < x < 6. The point where 5 < x < 6 is reached depends on the nature of the flexible comonomers. The higher their basicity or flexibility, the higher the concentration of rigid monomers in the copolymer at the point of 5 < x < 6. In concentrated ternary systems of polymer l/polymer 2/solvent, a single anisotropic phase containing both polymers can be obtained when each polymer can form an anisotropic solution in the solvent. When either polymer is too flexible to form an anisotropic solution by itself, it will then separate from the ternary system into an isotropic phase, leaving the more rigid polymer in the coexisting anisotropic solution.

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“…2. Amounts of isolated rigid aromatic residues and long elements (25). presented as 70 pbenzamide residues, plotted against mole % p-aminobenzoic acid in the feedstock.…”

Section: Aharonimentioning

confidence: 99%

Rigid backbone polymers. XVI. Random copolyamides

Aharoni

1980

J. Appl. Polym. Sci.

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“…An important difference between solvents of these classes consists in the fact that, for the same PBA specimen, the appearance of an anisotropic phase in a solution in an acid solvent is reached at a higher critical concentration of the polyamide than in an a m i d e -s a l t s y s t e m [5,8].…”

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confidence: 99%

Effect of the nature of the solvent on the structure and properties of fibres based on poly-p-benzamide

Arfe'ev¹,

Chereiskii²,

Kuz'min³

et al. 1981

Fibre Chem

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N . M . A r f e ' e v , Z . Y u . C h e r e i s k i i , V . N. K u z ' m i n , a n d A . P . V e r k h o v e t s UDC 541.64:539.2The question of the connection between the properties of solutions of fibre-forming polymers and the nature of the solvent is an important one in the practical r e s p e c t , especially for polyamides of the p a r a -s t r u eture, of the type of poly-p-benzamide (PBA) and poly-p-phenyleneterephthalamide, since the c h a r a c t e r i s t i c s of fibres based on them depend considerably on from what solutions (isotropic or anisotropic) they have been p r e p a r e d [1]. In the present article we examine differences in the structure and properties of PBA fibres p r epared from solutions of the v e r y same polymer in two s o l v e n t s -s u l f u r i c acid and dimethylacetamide (DMAc) containing LiC1.

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The recent developments of thermotropic liquid crystalline polymers

Chung

1986

Polymer Engineering & Sci

203

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The historical development of both main‐chain (M.C.) and side‐chain (S.C.) liquid crystalline polymers (LCPs) is presented. Synthetic routes and characterization techniques for LCPs are introduced. Various approaches to reduce the melting points of M.C. LCPs and to increase the mesogenic order of S.C. LCPs are reviewed and evaluated. The criteria to form a liquid crystalline phase are then discussed. Comparisons among thermotropic, lyotropic, and low‐molecular‐weight liquid crystals are also made. It is concluded that the preparation of LCPs has been well developed by the industry, but that the understanding of the formation of LC domains has not been completely understood. The theoretical explanations for some unexpected results are still not available. These anomalies are detailed in this work. Future research activity en LCPs for plastics engineers is also mentioned in this article.

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Molecular weight characteristics of poly-p-benzamide

Cited by 9 publications

References 5 publications

Rigid backbone polymers. XVI. Random copolyamides

Rigid backbone polymers. XVI. Random copolyamides

Effect of the nature of the solvent on the structure and properties of fibres based on poly-p-benzamide

The recent developments of thermotropic liquid crystalline polymers

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