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Molecular dynamics, microstructures and mechanical properties of segmented polyurethane elastomers under gamma irradiation
Ist Teil von
Polymer degradation and stability, 2021-05, Vol.187, p.109539, Article 109539
Ort / Verlag
London: Elsevier Ltd
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•Influence of gamma irradiation on molecular dynamics and microstructures of PU was analyzed.•α-relaxation of PTMG-PU and PBA-PU elastomers exhibits converse tendency with irradiation dose.•Hard microdomains of PTMG-PU are more susceptible to gamma irradiation.
The influence of gamma irradiation on molecular dynamics, microstructures and mechanical properties of polyurethane (PU) elastomers with polyether (poly(tetramethylene glycol), PTMG) and polyester (poly(butylene adipate), PBA) soft segments has been studied. Dynamical mechanical analysis and broadband dielectric relaxation spectroscopy were used to investigate the molecular dynamics of PU elastomers. Interestingly, the α-relaxation exhibited contrasting tendency with irradiation dose for PTMG-PU and PBA-PU, demonstrating that main chain scission took place for PTMG soft segments, but main chain crosslink for PBA soft segments. The results of small-angle scattering technique indicated that the volume fraction of hard microdomains increase rapidly with irradiation dose. The microstructures of PTMG-PU were more susceptible to gamma irradiation compared with PBA-PU. The deterioration of tensile properties was not only related to irradiation damage of soft segments, but also caused by the destruction of the microstructures of hard microdomains.