Viscosity of acrylonitrile copolymers containing acid groups

Nekrasov, I.K.; Nikitina, N.P.

doi:10.1007/bf00547549

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“…Another patent discloses the effect of addition of mineral acid or organic acid to improve its spinning stability, suppress its gelation and improve thermal stability,19 but its role in altering viscosity is not referred to. Whereas monovalent metal chlorides, such as lithium chloride, are reported to diminish the dope viscosity, divalent metal salts generally increases it 20, 21. Trivalent metal salts causes gelation 22.…”

Section: Introductionmentioning

confidence: 99%

Effect of oxalic acid on the rheological properties of dope solution of poly[acrylonitrile‐co‐(methyl acrylate)‐co‐(itaconic acid)]

Devasia

Nair

Ninan

2004

Polymer International

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The very high dope viscosity of concentrated dope of poly[acrylonitrile-co-(methyl acrylate)-co-(itaconic acid)] (with M v = 10.67 × 10 5 g mol −1 ) in DMF could be diminished significantly by the addition of oxalic acid (OXA). The change in steady shear rheological behaviour caused by OXA has been analysed for the dope using a rheometer working in the viscosity mode. The temperature dependence of η 0 conformed to the Arrhenius-Frenkel-Eyring equation. G v decreased marginally with OXA concentration, and the least value was observed at an OXA concentration of 0.63 % by weight. Shear thinning behaviour was observed under higher shear rates for the terpolymer solutions in the presence and absence of OXA. The pseudoplasticity index (n) showed an abrupt initial increase on addition of OXA. The OXA concentration of 0.63 % by weight was advantageous for decreasing the viscosity of the polymer dope. The reduction in viscosity is attributed to the disturbed polymer-polymer interactions by way of H-bonding of OXA with the polymer. OXA-containing dope at higher shear rate could achieve very low viscosities.

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Section: Introductionmentioning

confidence: 99%