1984
DOI: 10.1021/ma00139a029
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Rheooptical investigation of the transition behavior of polyphosphazenes

Abstract: Wide-angle X-ray diffraction (WAXD), small-angle light, light scattering and birefringence were used to investigate the temperature dependence of the morphology of poly[bis(trifluoroethoxy)phosphazene]. Experiments conducted on solution cast films revealed a spherulitic morphology in the range 25-225 °C. Structural changes, associated with the transformation to the mesomorphic state, were found to occur in the temperature range 70-90 °C. Above the melting point, the material was isotropic by optical techniques… Show more

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Cited by 18 publications
(7 citation statements)
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“…30 demonstrates it quite obviously for PBFP 106). In X-ray fiber patterns of a mesomorphic sampie of PBFP, the first sharp reflection (11 A) is concentrated at the equator indicating the existence of the lateral order in the packing of macromolecules above Tm 14.82).…”
Section: )mentioning
confidence: 93%
“…30 demonstrates it quite obviously for PBFP 106). In X-ray fiber patterns of a mesomorphic sampie of PBFP, the first sharp reflection (11 A) is concentrated at the equator indicating the existence of the lateral order in the packing of macromolecules above Tm 14.82).…”
Section: )mentioning
confidence: 93%
“…Scale bars correspond to 50 nm. [20] They proposed an onconventional coalescent pathway,named growth mechanism, as the most likely pathway to lead to toroidal micelles.T his mechanism involves the presence of bicontinuous aggregates as intermediates.T hus,o ur results,t ot he best of our knowledge,s erve as the first experimental evidence of am orphological bicontinuous-to-toroid evolution triggered by the BCP concentration. Scale bar in (d) corresponds to 50 nm.…”
mentioning
confidence: 99%
“…Thesolution was aged for 24 h(without stirring) and analyzed by DLS (see Figure S8). [20] They proposed an onconventional coalescent pathway,named growth mechanism, as the most likely pathway to lead to toroidal micelles.T his mechanism involves the presence of bicontinuous aggregates as intermediates.T hus,o ur results,t ot he best of our knowledge,s erve as the first experimental evidence of am orphological bicontinuous-to-toroid evolution triggered by the BCP concentration. Both HRTEM and cryo-TEM (see Figure S2) confirmed the presence of bicontinuous nanospheres with the same structure as that obtained when 1mgof6 was dissolved in 3mLof THF.W hen the solution containing the bicontinuous nanospheres was slowly evaporated (with slow magnetic stirring under af low of N 2 (g) in ab ath at 20 8 8Ct oa void the cooling down of the solution) to reach ac oncentration of 2mgmL À1 Figure 2.…”
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confidence: 99%
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“…The majority of publications is dedicated to the description of the mesophase state of polyfluoroalkoxyphosphazenes [7][8][9][10][11][12]. Perhaps the presence of fluorine atoms at the side branches favors the occurrence of specific interaction, leading to a stepwise melting of the crystalline structure.…”
mentioning
confidence: 99%