Hydrodynamic behaviour and macromolecular rigidity of polymetaphenylene-isophthalamide in solution

Vitovskaya, M.G.; Astapenko, E. P.; Nikolayev, V.Ya.; Didenko, S. A.; Tsvetkov, V.N.

doi:10.1016/0032-3950(76)90283-5

Cited by 18 publications

(2 citation statements)

References 13 publications

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“…Alternative analysis of the viscosity and light-scattering 12 data using the semiempirical method proposed by Krigbaum 23 gave similar results for f 0 and q. We note that Tsvetkov and co-workers 25,26 reported values of q as low as 8 Å and as large as 22 Å for the same polymer from hydrodynamic data.…”

Section: Discussionsupporting

confidence: 70%

Tailored Rigid−Flexible Block Copolymers. 3. Fate of the Flexible Block within the Mesophase

et al. 1997

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Diblock copolymers were prepared by condensation of benzoyl-terminated poly(p-benzamide) [PhCO(PBA)] and anilino-terminated poly(m-phenylene isophthalamide) [PhNH(MPD-I)]. The copolymers were freed from unreacted prepolymers and also partially fractionated by selective extraction techniques. The formation of the nematic phase was investigated for three copolymers having a similar length of the rigid PhCO(PBA) block and a fraction β of flexible segment covering a range from 0.5 to 0.7. In the N,N-dimethylacetamide (DMAc) containing 3% LiCl solvent the critical volume fraction v 2 i of the PhCO(PBA) prepolymer was largely unaffected by copolymerization with a similar length of the flexible PhNH(MPD-I) block. At the largest β value only a 25% increase in the critical composition of PhCO(PBA) was observed. The mesophase appears capable of admitting much longer flexible sequences than anticipated. These results are qualitatively in line with a reduced flexibility of the flexible segment due to the self-consistent orientational field of the mesophase. However, comparison of data in aggregating and nonaggregating solvents suggests that mesophase formation should be described in terms of supramolecular assemblies rather than molecularly dispersed units.

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Section: Discussionsupporting

confidence: 70%

Tailored Rigid−Flexible Block Copolymers. 3. Fate of the Flexible Block within the Mesophase

et al. 1997

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“…Gel permeation chromatography (GPC) analyses were carried out with PL gel columns (Polymer Laboratories) of the nominal pore sizes 500, 10 4 , and 10 5 Å. DMF with 0.1% LiBr was used as a solvent, and the measurements were performed at 70 °C at a flow rate of 1.0 mL/min with a UV detector operating at 273 nm. The columns were calibrated with narrow standards (fractionated in our laboratory according to a method described previously24) of a suitable aromatic polyamide [poly( m ‐phenyleneisophthalamide)]. The molecular weight of the fractions was estimated from the viscosimetric equation,25 with the molecular weight in the peak assigned to the weight‐average molecular weight ( M w ).…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of aromatic polyamides containing alkylphthalimido pendent groups

Ferrero

Espeso

Campa

et al. 2002

J. Polym. Sci. A Polym. Chem.

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A series of polyisophthalamides containing pendent phthalimido groups and flexible side spacers were prepared from four novel diacids and three commercial aromatic diamines. These polyamides were prepared in high yields and with high molecular weights by direct polycondensation with triphenyl phosphite and pyridine as condensing agents. The weight‐average and number‐average molecular weights, measured by gel permeation chromatography, were 70,000–137,000 and 47,000–86,000 g/mol, respectively. The novel polyamides were amorphous and readily soluble and showed glass‐transition temperatures of 150–240 °C, as measured by differential scanning calorimetry. Thermogravimetric analysis showed that the 10% weight‐loss temperatures in nitrogen were 355–430 °C, a significant improvement in thermal stability having been observed with the increase in the side‐chain length. A theoretical quantum mechanical study was successfully carried out to explain these results. Flexible and tough films, cast from polymer solutions, showed tensile strengths of 50–125 MPa. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3711–3724, 2002

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Fractionation of Polymers

Barrales‐Rienda

Bello

et al. 1999

The Wiley Database of Polymer Properties

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Hydrodynamic behaviour and macromolecular rigidity of polymetaphenylene-isophthalamide in solution

Cited by 18 publications

References 13 publications

Tailored Rigid−Flexible Block Copolymers. 3. Fate of the Flexible Block within the Mesophase

Tailored Rigid−Flexible Block Copolymers. 3. Fate of the Flexible Block within the Mesophase

Synthesis and characterization of aromatic polyamides containing alkylphthalimido pendent groups

Fractionation of Polymers

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