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William MacKnight

Selected Works

Compatibility

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Crystallization, Thermal Behavior, And Compatibility In Isotactic Polystyrene/Poly(O-Chlorostyrene-Co-P-Chlorostyrene) Blends, William Macknight, C. Silvestre, S. Cimmino, F. E. Karasz Dec 1986

Crystallization, Thermal Behavior, And Compatibility In Isotactic Polystyrene/Poly(O-Chlorostyrene-Co-P-Chlorostyrene) Blends, William Macknight, C. Silvestre, S. Cimmino, F. E. Karasz

William MacKnight

The dependence of the kinetics of crystallization and melting behavior in isotactic polystyrene/poly-o-chlorostyrene-co-p-chlorostyrene (iPS /P( o-CIS-co-p-ClS) blends on tempera­ture, thermal history, and blend composition has been investigated. The crystallization rate at a given temperature and copolymer composition decreases with increasing copolymer content in the blend when the samples are premelted. These effects can be ascribed to the reduction of mobility of the crystallizable chains due to the presence of the copolymer and to the decrease in the number of heterogenous iPS nuclei as a result of the premelting process. The Avrami exponent values and the analysis of the blend morphology …

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Miscibility In Polycarbonate/ Poly(Styrene-Co-Methacrylic Acid) Blends And The Ternary System Involving Styrene-Butyl Acrylate Block Copolymer, William Macknight, Saburo Akiyama, F. E. Karasz, Junji Nambu Dec 1986

Miscibility In Polycarbonate/ Poly(Styrene-Co-Methacrylic Acid) Blends And The Ternary System Involving Styrene-Butyl Acrylate Block Copolymer, William Macknight, Saburo Akiyama, F. E. Karasz, Junji Nambu

William MacKnight

The miscibility ofbisphenol-A polycarbonate (PC) and poly(styrene-co-methacrylic acid) [P(S-MAA)] was investigated by differential scanning calorimetry (d.s.c.) and dynamic mechanical thermal analysis (d.m.t.a.). They seem to be partially miscible in solution-cast film, but to be immiscible in melt blend. In solution cast blends, they are miscible in a limited range of composition; at fraction of P(S-MAA) > 70 %. Miscibility of the ternary system consisting of PC, P(S-MAA ), and poly(styrene-butyl acrylate) [P(S-BA)] was also examined. The compatibility was enhanced by adding small amounts of P(S-BA) block copolymer. 

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Compatibility In Chlorinated Poly(Vinyl Chloride)/Poly(Ethylene-Co-Vinyl Acetate) Blends, William Macknight, Tomoo Shiomi, F. E. Karasz Dec 1985

Compatibility In Chlorinated Poly(Vinyl Chloride)/Poly(Ethylene-Co-Vinyl Acetate) Blends, William Macknight, Tomoo Shiomi, F. E. Karasz

William MacKnight

No abstract provided.

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Classifications Of Experimental Methods On Polymer Compatibility, William Macknight, Saburo Akiyama Dec 1985

Classifications Of Experimental Methods On Polymer Compatibility, William Macknight, Saburo Akiyama

William MacKnight

No abstract provided.

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Compatibility In Blends Of Two Random Copolymers Having A Common Monomer Segment, William Macknight, Tomoo Shiomi, F. E. Karasz Dec 1985

Compatibility In Blends Of Two Random Copolymers Having A Common Monomer Segment, William Macknight, Tomoo Shiomi, F. E. Karasz

William MacKnight

Miscibility in blends of random copolymers (A.,B1-:r),.,_ and (CyB1-y)111 can conveniently be displayed as domains in a Cartesian coordinate system in which the abscissa and ordinate represent the compositions of the respective copolymers. For the case in which the two copolymers have a common monomer unit (e.g., B) the isothermal boundary between domains of miscibility and immiscibility in a mean field treatment is determined by three segmental interaction parameters, XAB, XAC, and XBC, and the degrees of polymerization r1 and r2 of the copolymers. We have termed such representations "miscibility maps". The shape and size of the miscibility domain are …

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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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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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Problems In Compatibility Studies, William Macknight, F. E. Karasz Dec 1976

Problems In Compatibility Studies, William Macknight, F. E. Karasz

William MacKnight

No abstract provided.

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