Effect of the polymer structure on the viscoelastic and interfacial healing behaviour of poly(urea-urethane) networks containing aromatic disulphides

[Display omitted] •Poly-urea-urethanes with varying X-link densities but same SS content were prepared.•The effect of polymer structure on viscoelasticity and healing was studied.•A direct relation between fracture healing and viscoelasticity was found.•For similar Tg, higher and faster healing was...

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Bibliographic Details
Published in:European polymer journal 2017-12, Vol.97, p.120-128
Main Authors: Grande, A.M., Martin, R., Odriozola, I., van der Zwaag, S., Garcia, S.J.
Format: Article
Language:English
Subjects:
Covalent bonds
Crosslinking
Damage assessment
Disulfides
Disulphide
Fracture
Healing
Hydrogen bonds
Mechanical properties
Networks
Poly(urea-urethane)
Polymers
Property damage
Recovery
Rheological properties
Self-healing
Superposition (mathematics)
Viscoelasticity
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Summary:[Display omitted] •Poly-urea-urethanes with varying X-link densities but same SS content were prepared.•The effect of polymer structure on viscoelasticity and healing was studied.•A direct relation between fracture healing and viscoelasticity was found.•For similar Tg, higher and faster healing was found for the lowest crosslinking. The macroscopic interfacial healing behaviour in a series of urea-urethane networks as function of the hydrogen bonds and disulphides content is presented. The polymers were prepared with different crosslinking densities but with the same amount of dynamic covalent bonds (disulphide linkages). Tensile and fracture measurements were adopted to evaluate the degree of recovery of the mechanical properties after damage. Healing kinetics and healing efficiencies were quantitatively determined as a function of network composition, healing temperature and contact time. Finally, the recovery of mechanical properties was correlated with the viscoelastic response of the networks through rheological measurements and time-temperature superposition principle (TTS). The application of the TTS approach on both fracture healing and DMTA and subsequent mathematical descriptive model led to a better understanding of the influence of polymer architecture and that of the amount of reversible groups on the healing process.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2017.10.007