Microstructure in Polyether-ester and Polyether-urethane Block Copolymers: Electric Polarization and X-ray Diffraction as Morphological Probes |
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Page 57
... frequency and the " damped resonant frequency " . The imaginary limit of ε ' and of ε ' component ε " vanishes in the high and low frequency limits while peaking at w = wm . If the equation [ 3-1 ] is solved for ε " in terms of ...
... frequency and the " damped resonant frequency " . The imaginary limit of ε ' and of ε ' component ε " vanishes in the high and low frequency limits while peaking at w = wm . If the equation [ 3-1 ] is solved for ε " in terms of ...
Page 216
... frequency maximum is attributed to motion of segregated polyester segments while the low frequency maximum is due to molecular motions in interfacial regions composed of intimately mixed polyester and polyurethane segments . The above ...
... frequency maximum is attributed to motion of segregated polyester segments while the low frequency maximum is due to molecular motions in interfacial regions composed of intimately mixed polyester and polyurethane segments . The above ...
Page 255
... frequency change , in the cases of Q2 through Q7 the " maximum increases monotonically with test frequency . The effect is least pronounced in Q2 , but progressively increases to a dramatic level in Q7 . This trend is related to the ...
... frequency change , in the cases of Q2 through Q7 the " maximum increases monotonically with test frequency . The effect is least pronounced in Q2 , but progressively increases to a dramatic level in Q7 . This trend is related to the ...
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