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INVESTIGATION ON THE RELATIONSHIP BETWEEN INTRINSIC VISCOSITY AND MOLECULAR WEIGHT OF POLY (VINYL CHLORIDE-DIETHYL MALEATE)

Duan Qin

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Abstract

A poly (vinyichloride-diethyl maleate) copolymer has been fractionated by repeated precipitation method. All fractions and the unfractionated sample have been characterized by viscometry, dynamic osmometry, Zimm static osmometry, light scattering and gel permeation chromatography. After correction for polydispersity, a [η]～M relationship for monodisperse polymer solutions has been obtained: [η]=1.99×10~(-3)M~(0.87) (ml/g, at 25℃, in cyclohcxanone) For the copolymer solution in THF, the second virial coefficient A_2 decreases as the molecular weight increases. The relationship is A_2=2 slope ((?)_n RT)~(-1/2).

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What this paper is about

A poly (vinyichloride-diethyl maleate) copolymer has been fractionated by repeated precipitation method. All fractions and the unfractionated sample have been characterized by viscometry, dynamic osmometry, Zimm static osmometry, light scattering and gel permeation chromatography. After correction for polydispersity, a [η]～M relationship for monodisperse polymer solutions has been obtained: [η]=1.99×10~(-3)M~(0.87) (ml/g, at 25℃, in cyclohcxanone) For the copolymer solution in THF, the second virial coefficient A_2 decreases as the molecular weight increases. The relationship is A_2=2 slope ((?)_n RT)~(-1/2).

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Available abstract

A poly (vinyichloride-diethyl maleate) copolymer has been fractionated by repeated precipitation method. All fractions and the unfractionated sample have been characterized by viscometry, dynamic osmometry, Zimm static osmometry, light scattering and gel permeation chromatography. After correction for polydispersity, a [η]～M relationship for monodisperse polymer solutions has been obtained: [η]=1.99×10~(-3)M~(0.87) (ml/g, at 25℃, in cyclohcxanone) For the copolymer solution in THF, the second virial coefficient A_2 decreases as the molecular weight increases. The relationship is A_2=2 slope ((?)_n RT)~(-1/2).

Key concepts: Osmometer, Dispersity, Viscometer, Virial coefficient, Intrinsic viscosity, Gel permeation chromatography, Copolymer, Chemistry

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INVESTIGATION ON THE RELATIONSHIP BETWEEN INTRINSIC VISCOSITY AND MOLECULAR WEIGHT OF POLY (VINYL CHLORIDE-DIETHYL MALEATE) — Research Paper | ScholarLens