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Thermally activated multiple self‐healing diels‐alder epoxy system
Author(s) -
Dello Iacono S.,
Martone A.,
Pastore A.,
Filippone G.,
Acierno D.,
Zarrelli M.,
Giordano M.,
Amendola E.
Publication year - 2017
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.24570
Subject(s) - epoxy , materials science , polymer , monomer , cycloaddition , adduct , covalent bond , self healing , rheology , self healing material , thermal stability , polymer chemistry , composite material , chemical engineering , organic chemistry , chemistry , catalysis , medicine , alternative medicine , pathology , engineering
The introduction of thermo‐reversible covalent bonds in the molecular network is a recent approach to prepare self‐healing polymers upon a suitable thermal trigger. Among reversible reactions, Diels–Alder (D‐A) cycloaddition is an ideal candidate for the synthesis of mendable polymers, such as epoxy resins, with improved operative life. The D‐A adduct, referred to as 2Ph2Epo, was synthetized and crosslinked with a mixture of aliphatic and aromatic amines. The resin formulation aimed at reaching a compromise between the mending capability of cured material and its dimensional stability at high temperatures, required during healing cycles. The latter result was achieved by mixing the adduct with commercial DGEBA monomer. The ability of the adduct to give direct D‐A and reverse D‐A (r D‐A) has been verified by FT‐IR and rheological analysis on 2Ph2Epo. Mechanical tests were performed for assessing the self‐healing efficiency of the crosslinked 2Ph2Epo/DGEBA system. The multiple healing feature of the system was proved. The hybrid epoxy resin is able to recover damages, still exhibiting the pristine stiffness, while the strength of the system decreases after progressing healing cycles. POLYM. ENG. SCI., 57:674–679, 2017. © 2017 Society of Plastics Engineers