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William MacKnight

Selected Works

1970

Articles 1 - 10 of 10

Full-Text Articles in Entire DC Network

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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Thermal Properties Of Partially Hydrolyzed Ethylene-Vinyl Acetate Copolymers, William Macknight, R. J. Tetreault, Roger S. Porter Dec 1969

Thermal Properties Of Partially Hydrolyzed Ethylene-Vinyl Acetate Copolymers, William Macknight, R. J. Tetreault, Roger S. Porter

William MacKnight

No abstract provided.

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Dielectric Relaxation In Ethylene-Methacrylic Acid Copolymers And Their Salts, William Macknight, P. J. Phillips Dec 1969

Dielectric Relaxation In Ethylene-Methacrylic Acid Copolymers And Their Salts, William Macknight, P. J. Phillips

William MacKnight

No abstract provided.

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Dynamic And Steady-Shear Melt Rheology Of An Ethylene-Methacrylic Acid Copolymer And Its Salts, William Macknight, Kunisuke Sakamoto, Roger S. Porter Dec 1969

Dynamic And Steady-Shear Melt Rheology Of An Ethylene-Methacrylic Acid Copolymer And Its Salts, William Macknight, Kunisuke Sakamoto, Roger S. Porter

William MacKnight

No abstract provided.

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Dielectric Properties Of Poly(2, 6-Dimethyl Phenylene Oxide), William Macknight, F. E. Karasz, J. Stoelting Dec 1969

Dielectric Properties Of Poly(2, 6-Dimethyl Phenylene Oxide), William Macknight, F. E. Karasz, J. Stoelting

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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Birefringence Studies Of The Relaxation Of Ethylene-Methacrylic Acid Copolymers And Their Salts, William Macknight Dec 1969

Birefringence Studies Of The Relaxation Of Ethylene-Methacrylic Acid Copolymers And Their Salts, William Macknight

William MacKnight

The strain-optical coefficient of ethylene-methacrylic acid copolymers is measured in static and dynamic experiments as a function of temperature and degree of ionization. An alpha optical loss peak which cor­responds to a mechanical loss peak is found for the ionized salt but not for the un-ionized acid. This peak is associated with mobility of an ionized domain. Birefringence relaxation curves are found to be super­posable using horizontal and vertical shift factors. A plot of the logarithmic shift factor against (1/T) gives a broken curve exhibiting two activation energies for the salt indicating contributions by two processes. 

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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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Thermal Properties Of Polyurethanes. Enthalpies And Entropies Of Fusion, William Macknight, T. Kajiyama Dec 1969

Thermal Properties Of Polyurethanes. Enthalpies And Entropies Of Fusion, William Macknight, T. Kajiyama

William MacKnight

Enthalpies and entropies of fusion have been determined for two series of scmicrystalline polyurethanes. The H series is based on 1,6-hexamethylene diiso­cyanate and various a, 01-diols containing from 2 to 10 methylene units. The DP series is based on 4,4'-methylene diphenyl diisocyanate and various a, m-diols containing from 2 to 10 methylene units. Differential Scanning Calorimetry (DSC) was used in con­j unction with X-ray analysis (X-ray method) and low molecular-weight diluents (diluent method) to determine the enthalpies of fusion. Agreement between the X-ray method and the diluent method was good. 
Differences between the enthalpies and entropies of fusion of the …

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Dynamic Mechanical Properties Of Poly(2, 6-Dimethyl-1,4-Phenylene Ether)-Polystyrene Blends, William Macknight, J. Stoelting, F. E. Karasz Dec 1969

Dynamic Mechanical Properties Of Poly(2, 6-Dimethyl-1,4-Phenylene Ether)-Polystyrene Blends, William Macknight, J. Stoelting, F. E. Karasz

William MacKnight

Blends of poly(2,6-dimethyl-l,4-phenylene ether) (FPO) and a tactic polystyrene (PS) have been prepared by mechan­ically mixing powders of the two polymers and subjecti􀀇ng the mixtures to three different thermal treatments. Three different 
compositions were studied by the dynamic m􀀋echaniac􀀌l and DSC techniques. The weight fractions of FPO m the mixtures 
were 0.25, 0.50 and 0.75. The dynamic mechanical measure­
ments indicate that partial mixing took place but that two 
distinct phases, one rich in PS and the other in FPO, exis􀀕 􀀖n all the mixtures studied. Each phase exhibits a charactenstlc 
relaxation peak associated with the glass transition of that  …

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