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Chemical Engineering

William MacKnight

1987

Articles 1 - 16 of 16

Full-Text Articles in Engineering

The Effect Of Chain Microstructure On Polymer- Polymer Miscibility, William Macknight, A. C. Balazs, F. E. Karasz Dec 1986

The Effect Of Chain Microstructure On Polymer- Polymer Miscibility, William Macknight, A. C. Balazs, F. E. Karasz

William MacKnight

A mean field model for the miscibility of binary polymer 
systems containing random copolymers has been extended to take 
into account the microstructure of the respective macromolecular constituents. The resulting model has been applied to the special 
case of mixtures of copolymers containing identical moieties but differing in microstructure and or composition. An example of 
such a system is the mixture of polyvinyl chloride and chlorinated polyethylene. 

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Interpenetration Of Interacting Coils In Polymer Monolayers, William Macknight, P. Cifra, F. E. Karasz Dec 1986

Interpenetration Of Interacting Coils In Polymer Monolayers, William Macknight, P. Cifra, F. E. Karasz

William MacKnight

Monte Carlo simulations demonstrate that in two-dimensional binary systems of interacting chains, such as in miscible polymer blends, interpenetration of the chains and expansion occurs. Both these observations differ from available results for single component melts in two dimensions. 

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Miscibility And Volume Changes Of Mixing In The Polystyrene/Poly(2-Chlorostyrene) Blend System, William Macknight, Yoshiharu Tsujita, Keiko Iwakiri, Takatoshi Kinoshita, Akira Takizawa Dec 1986

Miscibility And Volume Changes Of Mixing In The Polystyrene/Poly(2-Chlorostyrene) Blend System, William Macknight, Yoshiharu Tsujita, Keiko Iwakiri, Takatoshi Kinoshita, Akira Takizawa

William MacKnight

No abstract provided.

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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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Light Scattering Studies Of Ionomer Solutions, William Macknight, C. W. Lantman, D. G. Peiffer, S. K. Sinha, R. D. Lundberg Dec 1986

Light Scattering Studies Of Ionomer Solutions, William Macknight, C. W. Lantman, D. G. Peiffer, S. K. Sinha, R. D. Lundberg

William MacKnight

The molecular parameters responsible for the solution properties of poly(styrenesulfonate) ionomers in both a polar and a relatively nonpolar solvent have been studied. The second virial coefficients, apparent molecular weights, and diffusion coefficients have been measured by a combination of static and quasi-elastic light scattering techniques. Solution viscosities have also been measured. From this combination of scattering and rheological information, a more detailed description emerges of ionomer solution behavior over a range of solvent polarities, polymeric molecular weights and ionic contents, and concentrations.

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Transport-Morphology Relationships In Segmented Polybutadiene Polyurethanes: 2. Analysis, William Macknight, Myrna Serrano, Edwin L. Thomas, J Dottino Dec 1986

Transport-Morphology Relationships In Segmented Polybutadiene Polyurethanes: 2. Analysis, William Macknight, Myrna Serrano, Edwin L. Thomas, J Dottino

William MacKnight

No abstract provided.

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Random Homogeneous Sodium Sulfonate Polysulfone Ionomers: Preparation, Charaterization, And Blend Studies, William Macknight, John F. O'Gara, David J. Williams Dec 1986

Random Homogeneous Sodium Sulfonate Polysulfone Ionomers: Preparation, Charaterization, And Blend Studies, William Macknight, John F. O'Gara, David J. Williams

William MacKnight

No abstract provided.

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The Sodium Salts Of Sulphonated Poly(Aryl-Ether-Ether-Ketone) (Peek): Preparation And Characterization, William Macknight, Christian Bailly, David J. Williams, F. E. Karasz Dec 1986

The Sodium Salts Of Sulphonated Poly(Aryl-Ether-Ether-Ketone) (Peek): Preparation And Characterization, William Macknight, Christian Bailly, David J. Williams, F. E. Karasz

William MacKnight

No abstract provided.

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Poly(Ethylene Oxide)/ Poly(Methyl Methacrylate) Blends: Influence Of Tacticity Of Poly(Methyl Methacrylate) On Blend Structure And Miscibility, William Macknight, C. Silvestre, S. Cimmino, E. Martuscelli, F. E. Karasz Dec 1986

Poly(Ethylene Oxide)/ Poly(Methyl Methacrylate) Blends: Influence Of Tacticity Of Poly(Methyl Methacrylate) On Blend Structure And Miscibility, William Macknight, C. Silvestre, S. Cimmino, E. Martuscelli, F. E. Karasz

William MacKnight

No abstract provided.

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Swelling Of Model Networks, William Macknight, Zoran S. Petrovic, Ronald Koningsveld, Karel Dusek Dec 1986

Swelling Of Model Networks, William Macknight, Zoran S. Petrovic, Ronald Koningsveld, Karel Dusek

William MacKnight

An approach is proposed for the treatment of equilibrium swelling of networks obtained by cross-linking poly(propylene glycol) (PPG) chains with a triisocyanate cross-linker, "Desmodur RF􀂇 (DRF). Three models are used for the analysis of swelling of these polyurethane networks in toluene and methanol. It is shown that the x parameter of the copolymer network depends on the interactions between the solvent and the individual components of the network and between these components themselves. Swelling data in methanol and toluene appear to yield the same value for the interaction parameter of the network components provided (a) the differences in molecular surface …

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Methyl Ester Carboxylates: A Nuclear Magnetic Resonance Study, William Macknight Dec 1986

Methyl Ester Carboxylates: A Nuclear Magnetic Resonance Study, William Macknight

William MacKnight

Nuclear magnetic resonance has been used to investigate relaxation in the methyl ester precursor of a perfluorocarboxylate ionomer. Whereas the findings are broadly consistent with earlier interpretations of dynamic mechanical relaxation, minor interpretative changes are indicated, principally a revision of the assignment of the 'Y relaxation peak in the DMA data. Further insight is also obtained into the way in which even quite small amounts of water can influence in an important way the overall relaxation response of the system. 

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Available Ionomers, William Macknight Dec 1986

Available Ionomers, William Macknight

William MacKnight

A number of commercially available ionomers are discussed. These include Surlyns, Nafions, and Thermoplastic Elastomers based on sulfonated rubbery backbones. In addition, a number of experimental ionomers described in the literature are examined, including those with semi-crystalline, elastomeric, and plastic backbones. Finally, the synthesis and some properties of a new class of end-functionalized ionomers, known as halato-telechelics are described. It is postulated that the properties of all these various classes of ionomers can be understood on the basis of a morphological model in which the salt groups aggregate to form physical crosslinks and microphase separated ionic clusters. 

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A Review Of The Glass Transition In Surlyns And Polypentenamer Ionomers, William Macknight Dec 1986

A Review Of The Glass Transition In Surlyns And Polypentenamer Ionomers, William Macknight

William MacKnight

No abstract provided.

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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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A Small-Angle X-Ray Scattering Study Of Sodium Sulphonate Poly(Ether Ether Ketone), William Macknight, Louis Leung, Christian Bailly, John F. O'Gara, David J. Williams, F. E. Karasz Dec 1986

A Small-Angle X-Ray Scattering Study Of Sodium Sulphonate Poly(Ether Ether Ketone), William Macknight, Louis Leung, Christian Bailly, John F. O'Gara, David J. Williams, F. E. Karasz

William MacKnight

No abstract provided.

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23na-Nmr Of Solid State Ionomers: Lineshape, Shift, And Hydration Effects, William Macknight, L. Charles Dickinson, J. M. Connolly, James C. W. Chien Dec 1986

23na-Nmr Of Solid State Ionomers: Lineshape, Shift, And Hydration Effects, William Macknight, L. Charles Dickinson, J. M. Connolly, James C. W. Chien

William MacKnight

No abstract provided.

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