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Polystyrene-polybutadiene-polystyrene triblock copolymers were roll-cast from toluene solutions to form globally oriented films. As-processed films, containing process-related residual stresses, were exposed to solvent vapours. Three solvents were used in this study: toluene, which is a non-preferential solvent for polystyrene and polybutadiene; methyl-ethyl-ketone, which is a preferential solvent...
High-resolution imaging of ordered polymers is described both theoretically and experimentally. The relationship between the actual three-dimensional specimen structure and the resultant two-dimensional image intensity distribution is developed using the multislice formalism. The influence of the electron optical conditions on the image is demonstrated with experimental data, as well as with image...
Low-voltage, high-resolution scanning electron microscopy (LVHRSEM) is a promising new technique for polymer morphological characterization, and provides complementary data to transmission electron microscopy, X-ray scattering and the scanning probe microscopies. Practically, lateral resolution on the order of 50 at 1.0 keV accelerating voltage can be obtained in polymer samples. The utility...
Blends consisting of a systematic compositional series of starch/poly(ethylene-co-vinyl alcohol) were studied by using capillary viscometry. Three different types of starches were used: waxy maize, a starch containing essentially 100% amylopectin; native corn, possessing approximately 70% amylopectin and 30% amylose; and a treated, high-amylose starch, consisting of approximately 30% amylopectin...
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