Spectroscopic studies of diluent motion in glassy plasticized blends

No subglass transition mechanical loss peaks are observed in 50-50 blends of poly(2,6-dimethyl-1,4-phenylene oxide) and polystyrene. However, if trioctyl phosphate is added to the blend, the modulus lowers and a broad low-temperature loss peak appears. Nonspinning phosphorus line shapes were observe...

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Bibliographic Details
Published in:Macromolecules 1988-10, Vol.21 (10), p.2937-2940
Main Authors: Kambour, Roger P, Kelly, John M, McKinley, Barbara J, Cauley, Bonnie J, Inglefield, Paul T, Jones, Alan Anthony
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:No subglass transition mechanical loss peaks are observed in 50-50 blends of poly(2,6-dimethyl-1,4-phenylene oxide) and polystyrene. However, if trioctyl phosphate is added to the blend, the modulus lowers and a broad low-temperature loss peak appears. Nonspinning phosphorus line shapes were observed to determine if the diluent itself was moving in the glassy matrix, which is clearly the case. At low temperatures a typically axially symmetric line shape is observed which evolves to a narrow line just below the glass transition of the three-component system. The pattern of the collapse appears to take the form of a shift in population from nearly immobile diluent to fairly mobile diluent. This pattern of collapse can be associated with a broad distribution of correlation times. The geometric character of the motion of the mobile diluent is apparently isotropic rotation. 16 ref.--AA
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00188a008