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Chemical Engineering

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William MacKnight

Selected Works

1993

Articles 1 - 6 of 6

Full-Text Articles in Entire DC Network

Intramolecular Interactions In Poly(Styrene-Co-Acrylonitrile)/Poly(Epsilon-Caprolactone) Blends.Pdf, William Macknight, V. Janarthanan, J. Kressler, F. E. Karasz Dec 1992

Intramolecular Interactions In Poly(Styrene-Co-Acrylonitrile)/Poly(Epsilon-Caprolactone) Blends.Pdf, William Macknight, V. Janarthanan, J. Kressler, F. E. Karasz

William MacKnight

No abstract provided.

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Amorphous-Crystalline Block Copolymer And Amorphous Homopolymer Blends. 1. A Preliminary Report, William Macknight, Kazuo Sakurai, David J. Lohse, Donald N. Schulz, J.A. Sissano Dec 1992

Amorphous-Crystalline Block Copolymer And Amorphous Homopolymer Blends. 1. A Preliminary Report, William Macknight, Kazuo Sakurai, David J. Lohse, Donald N. Schulz, J.A. Sissano

William MacKnight

No abstract provided.

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Dynamics Of The Junction Point In Model Network Polymers By (31)P Nuclear Magnetic Relaxation, William Macknight, Jie-Feng Shi, L. Charles Dickinson, James C. W. Chien Dec 1992

Dynamics Of The Junction Point In Model Network Polymers By (31)P Nuclear Magnetic Relaxation, William Macknight, Jie-Feng Shi, L. Charles Dickinson, James C. W. Chien

William MacKnight

Solid-state 3lP NMR spin-lattice relaxation times (2'1~) have been measured over a wide range
of temperatures for a series of network polymers with molecular weights between cross-links (M,r)an ging
from 250 to 2900. The networks were formed from poly(tetrahydr0furan) and tris(4-isocyanatophenyl)
thiophosphate. The chain length dependence of the glass transition temperature obeys the Fox-Loshaek
relation. The dominant mechanism for 3lP spin-lattice relaxation was found to be chemical shift anisotropy.
The data fitted equally well to the ColeCole or the Williams-Watts relaxation functions. The apparent and
microscopic activation energies for the motion of junction points are 44-73 and 23-30 kJjmo1, respectively, …

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Thermodynamic Aging Of Immiscible Polymer Blends, William Macknight, Ronald Koningsveld, Karel Sole Dec 1992

Thermodynamic Aging Of Immiscible Polymer Blends, William Macknight, Ronald Koningsveld, Karel Sole

William MacKnight

No abstract provided.

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Structure In Mesogenic Diol-Containing Polyesters, William Macknight, Hartmut Fischer, F. E. Karasz Dec 1992

Structure In Mesogenic Diol-Containing Polyesters, William Macknight, Hartmut Fischer, F. E. Karasz

William MacKnight

No abstract provided.

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Small-Angle X-Ray Scattering (Saxs) Studies Of Sulfonated Polystyrene Ionomers. 1. Anomalous Saxs, William Macknight, Benjamin Chu, Dan Q. Wu, Robert D. Lundberg Dec 1992

Small-Angle X-Ray Scattering (Saxs) Studies Of Sulfonated Polystyrene Ionomers. 1. Anomalous Saxs, William Macknight, Benjamin Chu, Dan Q. Wu, Robert D. Lundberg

William MacKnight

Morphological studies of sulfonated polystyrenes by using small-angle X-ray scattering (SAXS)
and anomalous SAXS (ASAXS) are presented. ASAXS was used to study a model ionomer system: zinc
salts of sulfonated polystyrene (SPS). The results showed the presence of local clustering, as well as longrange
inhomogeneities of ions. The observed morphology could be attributed only to themetal ionicstructures,
as can be proven by means of ASAXS. However, with the SAXS patterns by SPS being much stronger than
those of polystyrene or SPS in acid form, the excess SAXS patterns of the metal ions can be measured with
greater precision by SAXS …

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