Colin Price

University of Manchester

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Colin Booth

University of the West of England

Ga‐Er Yu

Western Regional Research Center

David Attwood

University of the West of England

Frank Heatley

University of Manchester

Peter M. Budd

University of Manchester

Zhuo Yang

National Institute of Standards and Technology

Jifeng Ding

University of Manchester

R.B. Stubbersfield

University of Manchester

G. C. Allen

University of Bristol

Yulin Deng

Georgia Institute of Technology

Cooperative Institutions

University of Manchester

University of Sheffield

University of Leeds

University of Reading

Universidade Federal do Ceará

Daresbury Laboratory

National and Kapodistrian University of Athens

Universidade de Santiago de Compostela

AstraZeneca (United Kingdom)

Unilever (United Kingdom)

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Use of crown ether in the anionic polymerization of propylene oxide—1. Rate of polymerization

European Polymer Journal (1991)

Jifeng Ding Colin Price Colin Booth

Propylene oxide

Alkoxide

10.1016/0014-3057(91)90028-m

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Citations (43)

An electron microscopy study of stereocomplex formation by poly(methyl methacrylate)

European Polymer Journal (1989)

José R. Quintana R.B. Stubbersfield Colin Price Issa Katime

Tacticity

Tetrahydrofuran

Poly(N-isopropylacrylamide)

10.1016/0014-3057(89)90121-3

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Citations (4)

Solubilization of Alkylcyanobiphenyls in Aqueous Micellar Solutions of a Diblock Copolymer of Propylene Oxide and Ethylene Oxide

Langmuir (2001)

Zhuo Yang Evangelia Pousia Frank Heatley Colin Price Colin Booth

A diblock copolymer of propylene oxide and ethylene oxide, denoted P94E316, was prepared by sequential anionic polymerization of the two monomers. 13C NMR spectroscopy was used to obtain the absolute number-average molar mass and overall composition (whence the molecular formula), and gel permeation chromatography was used to confirm a narrow chain-length distribution. A number of techniques (light scattering, dye solubilization with DPH (1,6-diphenyl-1,3,5-hexatriene), surface tension) were used to confirm micellization in dilute aqueous solution and to determine the temperature dependence of the critical micelle concentration. Light scattering was also used to determine the temperature dependence of micellar association number and radius. Copolymer solutions of concentration 10 and 20 g dm-3 copolymer were used to solubilize a nematic liquid crystal mixture with a wide nematic range, coded BL002. The extent of solubilization in the temperature range 20−40 °C could be correlated with the extent of micellization of the copolymer, leading to an upper limit at 40 °C of ca. 50 mg (g of copolymer)-1, i.e., 180 mg (g of hydrophobe)-1. It was noted that BL002 solubilization could be adapted to provide a method for determining the critical micelle temperatures of aqueous solutions of the copolymer.

Propylene oxide

Micellar solutions

Hydrodynamic radius

Molar mass

Gel permeation chromatography

Aggregation number

10.1021/la001610f

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Citations (18)

Controlled synthesis of α,β‐difunctional poly(hexafluoropropylene oxide)

Die Makromolekulare Chemie (1992)

Jifeng Ding Martin Proudmore Richard H. Mobbs Afzal Khan Colin Price

Abstract An improved method is described for the preparation of difunctional poly(hexafluoropropylene oxide) of moderate molecular weight ( M n ≈ 6000) in good yield (>80 wt.‐%). With the dependence of chain transfer constant on initiator concentration known, at least under controlled conditions, good molecular‐weight control can be achieved.

Hexafluoropropylene

Chain (unit)

Molar mass distribution

10.1002/macp.1992.021930904

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Citations (11)

Materials chemistry communications. Synthesis of a zeolite NaA membrane

Journal of Materials Chemistry (1992)

Graham J. Myatt Peter M. Budd Colin Price Stuart W. Carr

A self-supporting zeolite NaA membrane has been synthesized from an initially homogeneous hydrothermal solution. Membranes ca. 7 µm thick were formed successfully on polyethylene, glass and poly(tetrafluoroethylene) substrates.

Hydrothermal Synthesis

10.1039/jm9920201103

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Citations (93)

The chain extension of anionic prepolymers in the preparation of aqueous poly(urethane–urea) dispersions

Polymer International (2003)

Mika Lahtinen Rachel K Pinfield Colin Price

Abstract Anionic polyurethane prepolymers end‐capped with isocyanate groups were dispersed and chain‐extended in aqueous media using three different extension agents: hydrazine, 1,2‐ethylene diamine (EDA) and 1,2‐propylene diamine (PDA). Two types of prepolymer were used. The first was prepared from isophorone diisocyanate (IPDI), α,α‐dimethylol propionic acid (DMPA) and poly(propylene oxide) diol (PPO) and the second from α,α,α′,α′‐tetramethyl‐1,3‐xylylene diisocyanate ( m ‐TMXDI), poly(caprolactone) diol (PCL) and DMPA. The colloidal particles which formed in the dispersion process and the constituent poly(urethane–urea) chains were characterised by a combination of dynamic and static light scattering, gel permeation chromatography and FTIR spectroscopy. Using EDA as the extender, a study was made of how the degree of extension depended on the molar ratio of amine to isocyanate groups, [NH 2 ]/[NCO] (= R A, I ). It was found that using a stoichiometric balance of isocyanate and amine groups did not lead to high degree of extension, and better chain extension was obtained at lower R A, I values. In a comparative study using stoichiometric balances of isocyanate and amine groups, the degrees of extension obtained using PDA and EDA were approximately the same, while hydrazine was the least effective. Force–extension studies were carried out on samples prepared from films cast from the aqueous poly(urethane–urea) dispersions in order to assess the influence of chain‐extender type and stoichiometry on bulk properties; values of Young's modulus, tensile strength and maximum extension are reported. Copyright © 2003 Society of Chemical Industry

Isophorone diisocyanate

Isocyanate

Prepolymer

10.1002/pi.1196

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Citations (15)

Thermomechanical studies on natural rubber in torsion and simple extension

Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases (1975)

G. C. Allen Colin Price Nobuya Yoshimura

Thermomechanical heat of deformation studies have been made on crosslinked natural rubber using a Calvet microcalorimeter. Using the Gaussian statistical theory of elasticity to correct for volume changes, torsional experiments gave a value for the relative energy contribution to the retractive force of 0.202± 0.017(=Me/M); simple extension experiments gave 0.19 ± 0.02 (=fe/f). When the data from simple extension experiments were corrected using two empirical dilation equations, values for fe/f of 0.13 ± 0.02 and 0.14 ± 0.02 were obtained. An assessment was made of the various routes available for studying the energetics of rubber deformation.

Rubber elasticity

10.1039/f19757100548

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Citations (14)

Thermodynamics of micellisation and gelation of oxyethylene/oxypropylene diblock copolymers in aqueous solution studied by light scattering and differential scanning calorimetry

Journal of the Chemical Society Faraday Transactions (1992)

Yulin Deng Ga‐Er Yu Colin Price Colin Booth

Aqueous solutions of a range of diblock copolymers, each with one stat-copoly(oxyethylene/oxypropylene) and one oxyethylene block, were investigated by light scattering and differential scanning calorimetry. Critical micelle temperatures were measured by both techniques and the standard thermodynamic micellisation functions were derived. Enthalpies of micellisation determined directly from DSC were compared with the standard enthalpies of micellisation determined via the Gibbs–Helmholtz equation. Gelation temperatures were also measured and the standard thermodynamic gelation functions derived. Typical values of the standard enthalpies were 300 kJ (mol of chains)–1 for micellisation and 30 kJ (mol of micelles)–1 for gelation: the latter quantity corresponding roughly to 1 kJ (mol of chains)–1.

Micellar solutions

Standard molar entropy

Helmholtz free energy

10.1039/ft9928801441

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Citations (39)

The formation of butyl-rubber modified polystyrene

Materials Letters (1995)

Issa Katime JoséR. Quintana Colin Price

Polystyrene

Styrene-butadiene

Phase inversion