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Polymer Science

Selected Works

Properties

Articles 1 - 28 of 28

Full-Text Articles in Engineering

Structure And Properties Of Polyelectrolyte-Surfactant Nonstoichiometric Complexes In Low-Polarity Solvents, William Macknight, Kirill N. Bakeev, Yang M. Shu, Alexander B. Zezin, Viktor A. Kabanov, Andrey V. Lezov, Alexander B. Mel'nikov, Igor P. Kolomiets, Evgenii I. Rjumtsev Dec 1995

Structure And Properties Of Polyelectrolyte-Surfactant Nonstoichiometric Complexes In Low-Polarity Solvents, William Macknight, Kirill N. Bakeev, Yang M. Shu, Alexander B. Zezin, Viktor A. Kabanov, Andrey V. Lezov, Alexander B. Mel'nikov, Igor P. Kolomiets, Evgenii I. Rjumtsev

William MacKnight

No abstract provided.

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The Preparation And Properties Of Zinc Coordination Complexes Of Poly(4-Vinylpyridine-Co-N-Butyl Methacrylate) Copolymers, William Macknight, Mihailo Jacovic, Ivan Perovic, R. W. Lenz Dec 1987

The Preparation And Properties Of Zinc Coordination Complexes Of Poly(4-Vinylpyridine-Co-N-Butyl Methacrylate) Copolymers, William Macknight, Mihailo Jacovic, Ivan Perovic, R. W. Lenz

William MacKnight

Two poly(4-vinylpyridine-co-n-butyl methacrylate) copolymers containing 14.2 and 30.0 mo!% of 4-vinylpyridine residues were prepared by free radical copolymerization reactions. Insoluble complexes were obtained for each copolymer by reaction with zinc chloride. The coordination complexes obtained had a molar ratio of 4-vinylpyridine residues to zinc atoms close to 2 in both cases. The rheological behavior of each of these complexes has been compared to that of the corresponding metal-free copolymers, which were recovered by decomplexation. The metal com­plexed polymers exhibited much higher glass transition temperatures and much longer high temperature relaxation times than the corresponding uncomplexed copolymers. 

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Synthesis And Properties Of Carboxylated Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Its Ionomer, William Macknight, Yuhui Huang, Guangmin Cong Dec 1985

Synthesis And Properties Of Carboxylated Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Its Ionomer, William Macknight, Yuhui Huang, Guangmin Cong

William MacKnight

No abstract provided.

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Properties Of Partially Cured Networks. 2. The Glass Transition, William Macknight, Claudius Feger Dec 1984

Properties Of Partially Cured Networks. 2. The Glass Transition, William Macknight, Claudius Feger

William MacKnight

The increase of the glass transition temperature during the isothermal cure of a model network
formed by the reaction of a,w-dihydroxypoly(propylene oxide) with tris(4-isocyanatophenyl) thiophosphate
has been investigated. It is shown that the reaction proceeds first under kinetic control and then under diffusion
control upon which is superimposed an intramolecular reaction beyond the gel point. Loop formation occurring
during the intramolecular reaction leads to a decrease in the rate of the Tg increase due to plasticization. The
dependence of the Tg change on the degree of cure is treated by a WLF approach. The diffusion-controlled
part of the cure of …

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Structure And Properties Of Sulfonated Polysulfone Ionomers, William Macknight, M. Drzewinski Dec 1984

Structure And Properties Of Sulfonated Polysulfone Ionomers, William Macknight, M. Drzewinski

William MacKnight

No abstract provided.

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Dynamic Mechanical Properties Of Perfluorocarboxylate Ionomers, William Macknight, Y. Nakano Dec 1983

Dynamic Mechanical Properties Of Perfluorocarboxylate Ionomers, William Macknight, Y. Nakano

William MacKnight

Two perfluorocarboxylate ionomers of different ion-exchange capacities (IEC) of 1.25 and 1.80 mequiv /g were studied to determine their dynamic mechanical behavior, water uptake, and rates of neu­tralization. These polymers consist of a fluorocarbon backbone containing short side chains on the end of which the carboxylate functionality resides. They are quite similar in many ways to the more familiar perfluorosulfonate ionomers that have been studied extensively. Methyl esters, free acids, and sodium, potassium, cesium, silver, barium, magnesium, and tetrabutylammonium salts were examined. In the case of the 1.25 mequiv / g IEC resin, a two-phase morphology consisting of a fluorocarbon …

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Dynamic Mechanical Properties Of Methacrylic-Acid-Grafted Polyethylene Films, William Macknight, Y. Nakano, H. Omichi Dec 1983

Dynamic Mechanical Properties Of Methacrylic-Acid-Grafted Polyethylene Films, William Macknight, Y. Nakano, H. Omichi

William MacKnight

No abstract provided.

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Properties Of Parially Cured Networks. 1. Curing Kinetics Of A Model Network, William Macknight Dec 1983

Properties Of Parially Cured Networks. 1. Curing Kinetics Of A Model Network, William Macknight

William MacKnight

Model networks based on a,w-dihydroxypoly(propylene oxides) and tris(4-isocyanatophenyl) 
thiophosphate were prepared. The curing kinetics were followed up to 97% conversion by measuring the 
change in the infrared absorption intensity of the isocyanate stretching band at 2200-23?0 cm·1. The ov􀄖􀄗all reaction kinetics were found to be second order and are described well by a scheme cons1stmg _ of competitive 
consecutive order reactions up to an extent of reaction of about 85% (the gel point). The observed inc􀄫ease in reaction rate at conversions greater than 85% is attributed to an increase in intramolecular reactions.

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Poly(Alkyl Alpha-Bromoacrylates). 2. Preparation And Properties Of The Methyl, Ethyl, N-Propyl, Isopropyl, N-Butyl, And N-Pentyl Esters Of Varied Tacticity, William Macknight, K. G. Saunders, R. W. Lenz Dec 1981

Poly(Alkyl Alpha-Bromoacrylates). 2. Preparation And Properties Of The Methyl, Ethyl, N-Propyl, Isopropyl, N-Butyl, And N-Pentyl Esters Of Varied Tacticity, William Macknight, K. G. Saunders, R. W. Lenz

William MacKnight

Polymers of widely ranging t.acticities, from highly isot.actic to highly syndiotactic, were synthesized from methyl, ethyl, n-propyl, iaopropyl, n-butyl, and n-pentyl a-bromoacrylates. The iaotactic polymers were synthesized with a modified Grignard complex consisting of the reaction product between a Grignard reagent and benzalacetophenone. A low-temperature, photolytically induced, free radical polymerization reaction was employed for the preparation of the syndiotactic polymers. Only atactic poly(tert-butyl a-bromoacrylate) could be synthesized because of its failure to polymerize with the modified Grignard complex or at temperatures below -20 °C. Polymer tacticity was determined by 19-MHz 13C NMR spectroscopy. Complete assignment.a for the ten pent.ad peaks …

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Hydrogen-Bonding Properties Of Hard-Segment Model Compounds In Polyurethane Block Copolymers, William Macknight, C. M. Brunette, S. L. Hsu Dec 1981

Hydrogen-Bonding Properties Of Hard-Segment Model Compounds In Polyurethane Block Copolymers, William Macknight, C. M. Brunette, S. L. Hsu

William MacKnight

No abstract provided.

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The Structure And Properties Of Ionomers, William Macknight, T. R. Ernest Jr. Dec 1980

The Structure And Properties Of Ionomers, William Macknight, T. R. Ernest Jr.

William MacKnight

No abstract provided.

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Structure And Properties Of Polybutadiene Polyurethanes, William Macknight, N. S. Schneider, C. M. Brunette, S. L. Hsu Dec 1980

Structure And Properties Of Polybutadiene Polyurethanes, William Macknight, N. S. Schneider, C. M. Brunette, S. L. Hsu

William MacKnight

No abstract provided.

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Solid State Properties Of Polymer Blends, William Macknight, F. E. Karasz Dec 1979

Solid State Properties Of Polymer Blends, William Macknight, F. E. Karasz

William MacKnight

No abstract provided.

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Present Understanding Of The Viscoelastic And Mechanical Properties Of Stereoregular Polymers, William Macknight Dec 1978

Present Understanding Of The Viscoelastic And Mechanical Properties Of Stereoregular Polymers, William Macknight

William MacKnight

No abstract provided.

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Dynamic Mechanical And Dielectric Properties Of Phosphonylated Polypentenamers And Their Hydrogenated Derivatives, William Macknight, D. Rahrig, C. Azuma Dec 1977

Dynamic Mechanical And Dielectric Properties Of Phosphonylated Polypentenamers And Their Hydrogenated Derivatives, William Macknight, D. Rahrig, C. Azuma

William MacKnight

Dynamic mechanical and dielectric properties of substituted polypentenamers with phosphonate side groups and their hydrogenated derivatives have been studied. Methyl esters, acids, and salts were investigated at two concentrations, 6.5 and 11.1 mole percent. In the unhydrogenated deriv­atives, one principal relaxation, labeled fl, is observed mechanically in the temperature range from -160 to 100°C. This {J relaxation arises from micro-Brownian segmental motion accompanying the glass transition. Its temperature is substantially affected by the substituent concentration while its breadth is affected by the chemical nature of the substituent. An extended "rubbery plateau" region exists in the acid and salt derivatives. The …

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Properties Of Polyethylene Modified With Phosphonate Side Groups. I. Thermal And Mechanical Properties.Pdf, William Macknight, R. A. Weiss, R. W. Lenz Dec 1976

Properties Of Polyethylene Modified With Phosphonate Side Groups. I. Thermal And Mechanical Properties.Pdf, William Macknight, R. A. Weiss, R. W. Lenz

William MacKnight

No abstract provided.

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Dynamic Mechanical Properties Of Polypentenamers With Pendant Ionic Groups And Their Hydrogenated Derivatives, William Macknight, K. Sanui Dec 1975

Dynamic Mechanical Properties Of Polypentenamers With Pendant Ionic Groups And Their Hydrogenated Derivatives, William Macknight, K. Sanui

William MacKnight

No abstract provided.

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Structure And Properties Of The System: Poly(2, 6-Dimethyl-Phenylene Oxide) Isotactic Polystyrene. Wide-Angle X-Ray Studies, William Macknight, R. Hammel, F. E. Karasz Dec 1974

Structure And Properties Of The System: Poly(2, 6-Dimethyl-Phenylene Oxide) Isotactic Polystyrene. Wide-Angle X-Ray Studies, William Macknight, R. Hammel, F. E. Karasz

William MacKnight

No abstract provided.

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Structure And Properties Of The System: Poly(2, 6-Dimethyl-Phenylene Oxide) Isotactic Polystyrene. Small-Angle X-Ray Studies, William Macknight, W. Wenig, F. E. Karasz Dec 1974

Structure And Properties Of The System: Poly(2, 6-Dimethyl-Phenylene Oxide) Isotactic Polystyrene. Small-Angle X-Ray Studies, William Macknight, W. Wenig, F. E. Karasz

William MacKnight

No abstract provided.

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Dynamic Mechanical Properties Of A Polypentenamer And Its Hydrogenated Derivatives, William Macknight, K. Sanui, R. W. Lenz Dec 1973

Dynamic Mechanical Properties Of A Polypentenamer And Its Hydrogenated Derivatives, William Macknight, K. Sanui, R. W. Lenz

William MacKnight

ABSTRACT: A dynamic mechanical study has been carried out on· a polypentenamer and its hydrogenated de­rivatives. The temperature range was from -160 to 130° and frequencies of 3.5, 11, and 110 Hz were employed. The starting polypentenamer was amorphous and the completely hydrogenated derivative resembled linear poly­ethylene with a melting point of 130° and a degree of crystallinity of 85%. Three relaxation regions were found in the temperature and frequency range investigated and these are labeled a, {:J, and -y in order of decreasing tem­perature. The a relaxation (5-115°, 3.5 Hz) is absent in the amorphous polymers and those of …

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The Hydrogenation Of A Polypentenamer And Thermal Properties Of The Resulting Products, William Macknight, K. Sanui, R. W. Lenz Dec 1972

The Hydrogenation Of A Polypentenamer And Thermal Properties Of The Resulting Products, William Macknight, K. Sanui, R. W. Lenz

William MacKnight

No abstract provided.

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Physical Properties Of The System: Poly(2,6-Dimethylphenylene Oxide)-Polystyrene, William Macknight, J. Stoelting, F. E. Karasz Dec 1970

Physical Properties Of The System: Poly(2,6-Dimethylphenylene Oxide)-Polystyrene, William Macknight, J. Stoelting, F. E. Karasz

William MacKnight

No abstract provided.

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Mechanical And Thermal Properties Of Phosphorylated Polyethylene, William Macknight, P. J. Phillips Dec 1969

Mechanical And Thermal Properties Of Phosphorylated Polyethylene, William Macknight, P. J. Phillips

William MacKnight

No abstract provided.

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Structure And Properties Of Polyethylene Modified With Phosphonic Acid Side Groups. Ii. Dielectric Properties, William Macknight, P. J. Phillips, F. A. Emerson Dec 1969

Structure And Properties Of Polyethylene Modified With Phosphonic Acid Side Groups. Ii. Dielectric Properties, William Macknight, P. J. Phillips, F. A. Emerson

William MacKnight

No abstract provided.

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Structure And Properties Of Polyethylene Modified With Phosphonic Acid Side Groups. I. Mechanical And Thermal Studies, William Macknight, P. J. Phillips Dec 1969

Structure And Properties Of Polyethylene Modified With Phosphonic Acid Side Groups. I. Mechanical And Thermal Studies, William Macknight, P. J. Phillips

William MacKnight

A sample of low-density polyethylene containing 1.4 long chain branches per 100 carbon atoms was chemically modified by the inclusion of phosphonic acid side groups. Dynamic mechanical and differential scanning calorimetry (dsc) studies were carried out on the unmodified polyethylene and on samples containing 0.8, 1.8, 2.8, and 7.4 phosphonic acid side groups per 100 carbon atoms. The dsc results show that the weight per cent crystallinity is a decreasing function of the phosphonic acid concentration, no crystallinity being detectable by dsc in the material with highest phosphonic acid content. The effect is partly kinetic as illustrated by the fact …

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Structure And Properties Of Ethylene-Methacrylic Acid Copolymers And Their Sodium Salts: Dielectric And Proton Magnetic Relaxation Studies, William Macknight, B. E. Read, E. A. Carter, T. M. Connor Dec 1968

Structure And Properties Of Ethylene-Methacrylic Acid Copolymers And Their Sodium Salts: Dielectric And Proton Magnetic Relaxation Studies, William Macknight, B. E. Read, E. A. Carter, T. M. Connor

William MacKnight

No abstract provided.

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Properties Of Ethylene - Methacrylic Acid Copolymers And Their Sodium Salts: Infrared Studies, William Macknight, L. W. Mckenna, B. E. Read Dec 1966

Properties Of Ethylene - Methacrylic Acid Copolymers And Their Sodium Salts: Infrared Studies, William Macknight, L. W. Mckenna, B. E. Read

William MacKnight

An infrared spectroscopic investigation of ethylene-methacrylic acid copolymers and their sodium salts has been carried out. All the copolymers studied were based on a parent copolymer containing 4.1 mol % of methacrylic acid groups. This was then neutralized to various e;d;ents (from O to 78%) with sodium hydroxide. The per cent ionization was determined from the integrated absorbance of the 1700 cm -1 un-ionized carbonyl stretching band. Temperature-dependent infrared studies showed that the behavior of the un-ionized acid groups over the entire range of ionization is quantitatively comparable to that of low molecular weight car­boxylic acids in nonpolar solvents. A …

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Properties Of Polymeric Sulfur, William Macknight, A. V. Tobolsky Dec 1964

Properties Of Polymeric Sulfur, William Macknight, A. V. Tobolsky

William MacKnight

No abstract provided.

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