Microstructure in Polyether-ester and Polyether-urethane Block Copolymers: Electric Polarization and X-ray Diffraction as Morphological Probes |
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Page 32
... films , the subject of Chapter 5 , and solution - cast films . Little evidence exists for the existence of spherulites in melt - cast films . High melt viscosity and elasticity suggest that segmented polyurethanes form gels , probably ...
... films , the subject of Chapter 5 , and solution - cast films . Little evidence exists for the existence of spherulites in melt - cast films . High melt viscosity and elasticity suggest that segmented polyurethanes form gels , probably ...
Page 87
... films tended to have chains perpendicular to the radial direction , melt - cast melt - cast films films produced structures where the PTMT chains angled approximately 45 ° from the radial direction . Matsuo , et al . ( Matsuo , 1982 ) ...
... films tended to have chains perpendicular to the radial direction , melt - cast melt - cast films films produced structures where the PTMT chains angled approximately 45 ° from the radial direction . Matsuo , et al . ( Matsuo , 1982 ) ...
Page 186
... film and the the solution - polymerized , solvent - cast film . Both films exhibit glass transition onsets at 208 K , a considerably higher temperature than for the than for the other films other films in this in this study ( Q10 ...
... film and the the solution - polymerized , solvent - cast film . Both films exhibit glass transition onsets at 208 K , a considerably higher temperature than for the than for the other films other films in this in this study ( Q10 ...
Contents
THE CONDENSATION BLOCK COPOLYMER LITERATURE | 8 |
Schematic representation of different types of hard | 19 |
THE MEASUREMENT OF INTERFACIAL POLARIZATION | 30 |
20 other sections not shown
Common terms and phrases
amorphous phase analysis approximately average block copolymers calculated calorimetry component composition crystalline phase decreasing degree of polymerization dielectric spectroscopy differential scanning calorimetry diffraction lines DSC traces equation exhibit films frequency glass transition temperature gradients heat of fusion heating traces homopolymer hydrogen bonding increasing integral isotropic lamellae lattice Lilaonitkul maxima measured melting endotherm melting point microdomains microscopy microstructures modulus mold molecular weight N/cm² nucleation number-average paracrystalline parameters permittivity poly(tetramethylene polyester polyester crystallites polyether crystallization polyether melting polyether segments polyether sequences polymers polyurethane segments polyurethane sequences primary transition PTMEG PTMO PTMO-PTMT PTMT reaction regions rubbery plateau sample SAXS scanning scattering angle scattering patterns segment lengths segmented polyesters segmented polyether-esters segmented polyether-urethanes segmented polyurethanes shown in Figure spectra spectrometer spherulites Subaudio subcooling superlattice Table temperature range thermal thermoplastic elastomers urethane values volume fraction weight fraction X-ray diffraction X-ray scattering