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William MacKnight

Selected Works

Poly(2 6-dimethyl-1 4-phenylene oxide)

Publication Year

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Miscibility And Phase Behaviour In Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Poly(Fluorostyrene-Co-Bromostyrene) Blends, William Macknight, R. Vukovic, G. Bogdanic, Vjera Kuresevic, F. E. Karasz Dec 1987

Miscibility And Phase Behaviour In Poly(2,6-Dimethyl-1,4-Phenylene Oxide) And Poly(Fluorostyrene-Co-Bromostyrene) Blends, William Macknight, R. Vukovic, G. Bogdanic, Vjera Kuresevic, F. E. Karasz

William MacKnight

Copolymers of or tho (para )fluorostyrene and ortho(para )bromostyrene with a range of copolymer compositions were prepared by free radical polymerization in toluene solution using azobis­(isobutyronitrile). The miscibility and phase behaviour of these copolymers in blends with poly(2,6-dimethyl-l,4-phenylene oxide) (PPO) have been studied by differential scanning calorimetry. Of the four possible copolymer systems, miscibility was observed only for PPO/poly(o-fluorostyrene­co-p-bromostyrene) blends in which the copolymer contains between 11 and 73 mo!% p-bromostyrene. High temperature phase separation in the miscible blends is a function of copolymer composition and of the thermal history. The results can be explained on the basis of the …

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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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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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Compatibility Of Poly(2,6-Dimethyl-1,4-Phenylene Oxide) (Ppo)/Poly(Styrene-Co-4-Chlorosyrene) Blends. I. Differential Scanning Calorimetry And Density Studies, William Macknight, J. R. Fried, F. E. Karasz Dec 1977

Compatibility Of Poly(2,6-Dimethyl-1,4-Phenylene Oxide) (Ppo)/Poly(Styrene-Co-4-Chlorosyrene) Blends. I. Differential Scanning Calorimetry And Density Studies, William Macknight, J. R. Fried, F. E. Karasz

William MacKnight

No abstract provided.

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Compatibility Of Poly(2, 6-Dimethyl-1,4-Phenylene Oxide) (Ppo)/Poly(Styrene-Co-4-Chlorostyrene) Blends. Ii. Dielectric Study Of The Critical Composition Region, William Macknight, R. E. Wetton, J. R. Fried, F. E. Karasz Dec 1977

Compatibility Of Poly(2, 6-Dimethyl-1,4-Phenylene Oxide) (Ppo)/Poly(Styrene-Co-4-Chlorostyrene) Blends. Ii. Dielectric Study Of The Critical Composition Region, William Macknight, R. E. Wetton, J. R. Fried, F. E. Karasz

William MacKnight

Random copolymers of styrene and 4-chlorostyrene bridging the composition range from compatibility to incompatibility with poly(2,6-dimethyl-1,4-phenylene oxide) have been blended with the latter polymer. Dielec­tric constant and loss data are reported for the key blends containing 60% by weight of the copolymers. Dielectric re­laxation spectra were found to be far broader for the blends than for the parent copolymers and this is interpreted primarily as arising from a wide range of local concentrations which are present even in the "compatible" blend. Phase separation produces a characteristic shoulder on the high-frequency side of the relaxation which is interpreted in terms of …

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