期刊
POLYMER
卷 120, 期 -, 页码 189-196出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2017.05.060
关键词
Self-healing; PDMS elastomer; Acylhydrazone groups; Hydrogen bonds
资金
- NSFC [21374127, 21674122]
- National Basic Research Program of China (973 Program) [2014CB643601]
A PDMS elastomer based on acylhydrazone groups with both acid- and heat-assisted self-healing properties was successfully prepared from tetra-acylhydrazine-terminated PDMS and tereph-thalaldehyde through solution casting. The good healing performance was obtained with catalytic acetic acid for 24 h at 25 degrees C or by annealing at 120 degrees C for 2 h. The elastomer exhibited a reversible transition near 80 degrees C observed by rheological measurements and variable-temperature FTIR, which corresponded to the dissociation and reconstruction of hydrogen bonds between acylhydrazone groups. Since the non-equimolar sample presented similar behaviors with the equimolar sample, it verifies that the reversible dissociation/reformation of hydrogen bonds dominates the heat-assisted self-healing process. This finding will enable better understanding of the contribution of hydrogen bonding interactions in acylhydrazone self-healing systems, thus promoting the development of self-healing bulk materials based on acylhydrazone groups. (C) 2017 Published by Elsevier Ltd.
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