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William MacKnight

Selected Works

1983

Articles 1 - 9 of 9

Full-Text Articles in Entire DC Network

Structure And Morphology Of Segmented Polyurethanes: 2. Influence Of Reactant Incompatibility, William Macknight, C. H. Y. Chen, R. M. Briber, E. L. Thomas, M. Xu Dec 1982

Structure And Morphology Of Segmented Polyurethanes: 2. Influence Of Reactant Incompatibility, William Macknight, C. H. Y. Chen, R. M. Briber, E. L. Thomas, M. Xu

William MacKnight

By following the copolymerization of a model polyurethane system, HTP B D /2,6 (or 2.4 )-TD I /B DO, by
optical microscopy, it was found that initial reactant incompatibility was the key factor in determining the
final morphology of bulk sample. Based on this finding and the esults from the previous paper, models
are proposed to describe the morphology during polymerization of this particular polyurethane system
for several hard segment compositions where both macro-phase separation and micro-phase separation
of reactants can occur during polymerization. The copolymerization of one seemingly compatible
system, PPO-EO/MDl/BDO, which has been previously studied and commercially produced, …

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A Differential Scanning Calorimetry Method For Determining Strain-Induced Crystallization In Elastomeric Fibers, William Macknight, R. E. Lyon, R. J. Farris Dec 1982

A Differential Scanning Calorimetry Method For Determining Strain-Induced Crystallization In Elastomeric Fibers, William Macknight, R. E. Lyon, R. J. Farris

William MacKnight

No abstract provided.

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Phase Behavior In Copolymer Blends: Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Halogen-Substituted Styrene Copolymers, William Macknight, Gerrit Ten Brinke, F. E. Karasz Dec 1982

Phase Behavior In Copolymer Blends: Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Halogen-Substituted Styrene Copolymers, William Macknight, Gerrit Ten Brinke, F. E. Karasz

William MacKnight

A recently introduced mean field theory of phase behavior in polymer/ copolymer systems is extended to random copolymer/ copolymer systems. Miscibility in these systems does not require any specific interaction but rather a "repulsion" between the different covalently bonded monomers of the copolymers. Conversely, immiscibility may occur in systems with specific interaction due to an "attraction" between the 
different covalently bonded monomers of the copolymers. Using the mean field approach, we discuss in detail the phase behavior in polymer/ copolymer systems. The requirements for the occurrence of a symmetric or an asymmetric (im)miscibility window in a temperature-copolymer composition diagram are …

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Dynamic Mechanical And Dielectric Properties Of An Epoxy Resin During Cure, William Macknight, Walter X. Zukas, N. S. Schneider Dec 1982

Dynamic Mechanical And Dielectric Properties Of An Epoxy Resin During Cure, William Macknight, Walter X. Zukas, N. S. Schneider

William MacKnight

No abstract provided.

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Compatibility Of Some Fluorosubstituted Styrene Polymers And Copolymers In Blends With Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And With Polystyrene, William Macknight, Radivoje Vukovic, F. E. Karasz Dec 1982

Compatibility Of Some Fluorosubstituted Styrene Polymers And Copolymers In Blends With Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And With Polystyrene, William Macknight, Radivoje Vukovic, F. E. Karasz

William MacKnight

No abstract provided.

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Structure And Morphology Of Segmented Polyurethanes: 1. Influence Of Incompatibility On Hard-Segment Sequence Length, William Macknight, M. Xu, C. H. Y. Chen, E. L. Thomas Dec 1982

Structure And Morphology Of Segmented Polyurethanes: 1. Influence Of Incompatibility On Hard-Segment Sequence Length, William Macknight, M. Xu, C. H. Y. Chen, E. L. Thomas

William MacKnight

No abstract provided.

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Compatibility Of Poly(P-Fluorostyrene-Co-O-Fluorostyrene) With Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Polystyrene, William Macknight, R. Vukovic, F. E. Karasz Dec 1982

Compatibility Of Poly(P-Fluorostyrene-Co-O-Fluorostyrene) With Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Polystyrene, William Macknight, R. Vukovic, F. E. Karasz

William MacKnight

No abstract provided.

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Evidence For Critical Double Points In Blends Of Polystyrene And Poly(O-Chlorostyrene), William Macknight, Sherrie L. Zacharius, Gerrit Ten Brinke, F. E. Karasz Dec 1982

Evidence For Critical Double Points In Blends Of Polystyrene And Poly(O-Chlorostyrene), William Macknight, Sherrie L. Zacharius, Gerrit Ten Brinke, F. E. Karasz

William MacKnight

Theoretical and experimental evidence is put forward to prove that both UCST and LCST behavior can be found in blends of polystyrene and poly(o-chlorostyrene). Vapor sorption results combined with known results of heat of mixing experiments lead to the conclusion of the rather uncommon UCST behavior. 
Existing data of T, measurements show that the PS/PoClS system is extremely sensitive to a small change in molar mass. A decrease in molar mass of PS of less than 4000 transforms an only partially miscible system 
into a system that is miscible throughout the entire experimental temperature range from 150 to 400 °C. …

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Compatibility Of Poly(2.6-Dimethyl-1,4-Phenylene Oxide)/Poly(Fluorostyrene-Co-Chlorostyrene) Blends, William Macknight, Radivoje Vukovic, Vjera Kuresevic, F. E. Karasz, Nikola Segudovic Dec 1982

Compatibility Of Poly(2.6-Dimethyl-1,4-Phenylene Oxide)/Poly(Fluorostyrene-Co-Chlorostyrene) Blends, William Macknight, Radivoje Vukovic, Vjera Kuresevic, F. E. Karasz, Nikola Segudovic

William MacKnight

No abstract provided.

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