Universal calibration equations in gel permeation chromatography: polymers in good solvents

Dawkins, J. V.

doi:10.1016/0014-3057(77)90033-7

Cited by 9 publications

(1 citation statement)

References 13 publications

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“…Calculations of the average molar masses from chromatograms required a molar mass calibration curve for the EP copolymers. Calibration data for peak molar mass MEv was calculated from an experimental calibration Mrs established with polystyrene standards with the following equation [12] log ME1, --log Mi, s = log C (1) in which the MEV and Mrs calibration curves are assumed to be parallel and C is a constant independent of molar mass. Experimental studies [13] of universal calibration for EP copolymers in tetrahydrofuran by combined GPC and solution viscometry indicated that C in Equation (1) was about 0.7.…”

Section: Ep Copolymer Standardsmentioning

confidence: 99%

Flocculation studies of non-aqueous poly(methyl methacrylate) dispersions. II. Stabilization with the diblock copolymer poly (styrene-b-[ethylene-co-propylene])

Dawkins

Shakir

1987

Colloid & Polymer Sci

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Well defined non-aqueous dispersions of poly(methyl methacrylate) stabilized by the diblock copolymer poly (styrene-b-[ethylene-co-propylene]) have been studied with a dispersion medium consisting of a binary liquid mixture of n-heptane and n-propanol. Flocculation was induced by adding n-propanol at constant temperature, to find the critical flocculation volume, and by cooling, to find the critical flocculation temperature. Theta conditions for ethylene-propylene copolymer in the same binary liquid mixture were determined using samples obtained by hydrogenating polyisoprene standards. These dispersions just retained stability at theta conditions, with flocculation occurring when the dispersion medium was slightly worse than a theta system for the stabilizing ethylene-propylene chains.

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Section: Ep Copolymer Standardsmentioning

confidence: 99%

Flocculation studies of non-aqueous poly(methyl methacrylate) dispersions. II. Stabilization with the diblock copolymer poly (styrene-b-[ethylene-co-propylene])

Dawkins

Shakir

1987

Colloid & Polymer Sci

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Micelle formation by AB block copolymers of polystyrene and poly(dimethylsiloxane) in n‐alkanes

Dawkins

Taylor

1979

Makromol. Chem.

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AB block copolymers of polystyrene and poly(dimethylsi1oxane) have been synthesized by ''living'' anionic polymerisation methods. The micellar behaviour of these block copolymers in n-alkanes has been investigated as a function of the molecular weight of the polystyrene anchor A block and of the anchor/soluble balance (ASB) calculated from the relative block lengths. Micelle sizes have been determined by electron microscopy and are shown to conform to a simple geometrical model based upon two concentric spheres, when the ASB is below 18.

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Kinetic Investigation of the Emulsion Polymerization of Vinylidene Fluoride

Hanamirian,

Agostini,

Chaduc

et al. 2024

Macro Reaction Engineering

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Poly(vinylidene fluoride) (PVDF) is among the most produced fluoropolymers, second only to polytetrafluoroethylene. Despite its popularity, the complex microstructural properties achieved during the polymerization are not well documented in the literature. In particular, available models only track the chain length distribution of the polymer, while neglecting the distribution of other important properties, affecting the final behavior of the product. In this work, a 2D kinetic model, evaluating not only the chain length but also the number of terminal double bonds (TDBs) per chain, is developed. The numerical solution of the model is achieved by fractionating the population of polymer chains into classes with a specific number of TDBs and using the method of moments for each class. The model results are compared with experimental evidences for the amount of produced polymer, moles of main chain‐ends, number, and weight average molecular weight as well as full molecular weight distribution. Based on this comparison, kinetic parameters are estimated by optimization using genetic algorithm. The model reliability is finally verified using additional experimental data at different temperatures and amounts of initiator.

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Universal calibration equations in gel permeation chromatography: polymers in good solvents

Cited by 9 publications

References 13 publications

Flocculation studies of non-aqueous poly(methyl methacrylate) dispersions. II. Stabilization with the diblock copolymer poly (styrene-b-[ethylene-co-propylene])

Flocculation studies of non-aqueous poly(methyl methacrylate) dispersions. II. Stabilization with the diblock copolymer poly (styrene-b-[ethylene-co-propylene])

Micelle formation by AB block copolymers of polystyrene and poly(dimethylsiloxane) in n‐alkanes

Kinetic Investigation of the Emulsion Polymerization of Vinylidene Fluoride

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