The relation between the molecular weight and intrinsic viscosity of polyacrylonitrile

Bamford, C. H.; Jenkins, A. D.; Johnston, R.; White, E. F. T.

doi:10.1039/tf9595500168

Cited by 48 publications

(13 citation statements)

References 4 publications

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“…The original value of 0.12 L'/2/mo1'/2-~1/2 was revised to 0.08485 to correspond with the British convention for k,. This value agrees very well with that reported by Bamford et al (1959a). White and Zissell (1963) determined many kinetic rate constants of AN in DMSO and their results were compared with those in DMF.…”

Section: Homogeneous Polymerizationsupporting

confidence: 90%

“…These values appear to be quite reliable and are the only ones widely cited in many classic textbooks of polymerization kinetics. Bamford et al (1959a) further studied the polymerization kinetics both in bulk and in DMF. The classic expression of the rate of polymerization in DMF was once again confirmed by their experimental results.…”

Section: Homogeneous Polymerizationmentioning

confidence: 99%

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A Comprehensive Simulator/Database Package for Reviewing Free-Radical Homopolymerizations

Gao

Penlidis

1996

Journal of Macromolecular Science, Part C: Polymer Reviews

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Section: Homogeneous Polymerizationsupporting

confidence: 90%

Section: Homogeneous Polymerizationmentioning

confidence: 99%

A Comprehensive Simulator/Database Package for Reviewing Free-Radical Homopolymerizations

Gao

Penlidis

1996

Journal of Macromolecular Science, Part C: Polymer Reviews

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“…The hydrolysis was carried out for 4 h. The number average molecular weight of PAN was calculated from intrinsic viscosity ( 7 ) by using the equation of Banford et a1. 6 The intrinsic viscosity in DMF at 25°C was estimated from the measured values of specific viscosity ( q8,) by the equation of Schulz and Sing.7…”

Section: Molecular Weight Of the Grafted Side Chainmentioning

confidence: 99%

Gamma‐radiation induced grafting of acrylonitrile onto guar gum: Influence of reaction conditions on the properties of the grafted and saponified products

Lokhande

Varadarajan

Nachane

1993

J of Applied Polymer Sci

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SYNOPSISIn the gamma-radiation induced grafting of acrylonitrile onto guar gum, the influence of different concentrations of the monomer acrylonitrile on the PAN add-on, the number average molecular weight of the PAN side chains, and the grafting frequency of the PAN side chains are reported. At 0.3 Mrad dosage, the PAN add-on were 32.4, 48.5, and 66.2% and the number average molecular weight of the PAN side chains were 59,700, 132,200, and 238,900, respectively, at three different reaction conditions. The frequency of grafting also showed considerable variation at 0.2 Mrad dosage, for all three sets of samples. The viscosity of the aqueous dispersions of the saponified samples at different concentrations are also reported. The water absorbency of the saponified samples were evaluated and the values were around 250 g/g. The fall in viscosity of the aqueous dispersions on storage were also evaluated. The observed fall in viscosity was lower in the case of the product with higher PAN content. 0 1993 John Wiley & Sons, Inc.

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“…C 42,87 H 7,60 N 5,55 Gef. C 42,94 H 7,39 N 5,30 Analytische Bestimmung des Phosphors: Zur Bestimmung des als Phosphoniumionen vorliegenden Phosphors wurden entsprechende Fraktionen vereinigt, im Vakuum (10-mbar) bei Raumtemp. eingedampft und der Phosphor emissionsspektralanalytisch bestimmt (Bausch & Lomb-Dual-Grating-Spectrograph).…”

Section: Isolierung Reinigung Undunclassified

Über den mechanismus der anionischen polymerisation von acrylnitril mit triäthylphosphin, 8. Über makrozwitterionen

et al. 1974

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Die anionische Polymerisation von Acrylnitril mit Triäthylphosphin als Initiator in Dimethylformamid wurde bei verschiedenen Temperaturen und unterschiedlichem Verhältnis der Monomer/Initiator‐Konzentrationen untersucht. Ergänzt durch spektroskopische Endgruppenbestimmung der Polymeranionen konnte mittels 1H‐NMR‐Spektroskopie und Gelchromatographie (GPC) sowie emissionsspektralanalytischer Phosphorbestimmung an den rohen und den durch Umfällungen bzw. GPC fraktionierten Polymerproben gezeigt werden, daß hier neben einer übertragung teilweise eine Polymerisation Über Makrozwitterionen auftritt. Für die Bildung von Makrozwitterionen, , sind jedoch Mindestwerte des Monomer/Initiator‐Verhältnisses sowie der Polymerisationstemperatur erforderlich; sind diese Voraussetzungen nicht erfüllt, findet durch das Zwitterion , gebildet aus Triäthylphosphin und Acrylnitril, unter Protonenabstraktion eine Übertragungsreaktion auf das Monomere statt. So entstandene Anionen, , lösen dann Polymerisationsketten aus. Die durch Erhöhung der Initiatorkonzentration sowie der Temperatur vermehrt auftretenden Nebenreaktionen lassen sich durch IR‐ bzw. UV‐spektroskopische Untersuchungen der Polymeren erfassen.

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The relation between the molecular weight and intrinsic viscosity of polyacrylonitrile

Abstract: A series of polymers of acrylonitrile with known or calculable number-average degrees of polymerization and molecular-weight distributions have been prepared by (i) bulk polymerization in the presence of triethylamine and (ii) homogeneous solution polymer-

Cited by 48 publications

References 4 publications

A Comprehensive Simulator/Database Package for Reviewing Free-Radical Homopolymerizations

A Comprehensive Simulator/Database Package for Reviewing Free-Radical Homopolymerizations

Gamma‐radiation induced grafting of acrylonitrile onto guar gum: Influence of reaction conditions on the properties of the grafted and saponified products

Über den mechanismus der anionischen polymerisation von acrylnitril mit triäthylphosphin, 8. Über makrozwitterionen

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