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Effect of the conversion degree and multiple healing on the healing efficiency of a thermally reversible self‐healing polymer
Author(s) -
Shabani Peyman,
Shokrieh Mahmood M.,
Zibaei Iman
Publication year - 2019
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4723
Subject(s) - materials science , flexural strength , self healing , differential scanning calorimetry , polymer , composite material , self healing material , energy conversion efficiency , curing (chemistry) , bending , flexural modulus , degree (music) , modulus , thermodynamics , optoelectronics , medicine , alternative medicine , physics , pathology , acoustics
In this paper, the effect of the cross‐links' conversion degree on the healing efficiency of a thermally remendable polymer based on the Diels‐Alder (DA) reaction was studied quantitatively. By using the differential scanning calorimetry (DSC) results along with the Kissinger method, the conversion degree of the thermally reversible cross‐links was predicted as a function of time and temperature. For investigating the healing efficiencies at different conversion degrees, three‐point bending specimens were fabricated under certain curing conditions, which guaranteed the formation of both reversible and irreversible bonds. Afterward, specimens failed under three‐point bending test and healed up to certain conversion degrees. The results revealed on average 15%, 38%, and 83% recovery of flexural strength and 89%, 91%, and 93% recovery of flexural modulus at conversion degrees of 0.6, 0.8, and 1, respectively. Moreover, by repeating the damaging and healing procedure, it was shown that the synthesized polymer has the capability to be healed several times.