2014
DOI: 10.1016/j.molstruc.2014.07.024
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Rigid and semi rigid polyurethane resins: A structural investigation using DMA, SAXS and Le Bail method

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Cited by 23 publications
(16 citation statements)
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“…Further, from Figure (b), a broad peak is found at 30° in the original, programmed, and recovered states, but the intensity of programmed SMPU is much higher than those of original and recovered samples. This is because the molecular chains in soft segments are stretched from the curled state in the horizontal direction during the programming . All these further validate the presence of molecular orientation in the programmed SMPU as shown in Figure (b).…”
Section: Resultssupporting
confidence: 71%
“…Further, from Figure (b), a broad peak is found at 30° in the original, programmed, and recovered states, but the intensity of programmed SMPU is much higher than those of original and recovered samples. This is because the molecular chains in soft segments are stretched from the curled state in the horizontal direction during the programming . All these further validate the presence of molecular orientation in the programmed SMPU as shown in Figure (b).…”
Section: Resultssupporting
confidence: 71%
“…Larger values of R g show larger size of phase domain. Rigid polyurethanes evidence larger R g values than semi rigid polyurethanes [28]. The highest R g value is shown by polyurethane P3 due to its more crystalline PEO segment and highest molecular weight which can be correlated with its highest value of storage modulus, E 0 [15].…”
Section: Saxs Analysismentioning
confidence: 93%
“…PUs having different soft segment chemistries commonly exhibit rather incomplete hard/soft demixing when polymerized in bulk or cast from solution, and the extent of segment segregation (and resulting hard domain morphology) is particularly important in determining mechanical and other physical properties [2]. Thus, hard segments having short sequence lengths (as well as so-called "lone" isocyanates [3], more prevalent at lower hard segment contents), show higher solubility in the soft phase than longer sequences for entropic reasons. In addition, similarity in cohesive energy density and/or the possibility of hydrogen bonding between hard and soft repeating units also encourages mixing processes [2].…”
mentioning
confidence: 99%
“…Thermoplastic polyurethanes have been extensively investigated with XRD (X-ray diffraction) and SAXS (small-angle X-ray scattering) for detailed structural information [2][3][4][5][6][7].…”
mentioning
confidence: 99%
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