期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 38, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201600678
关键词
hydrogen bonding; rubber; sacrificial bond; shape memory; TAD chemistry
资金
- National Basic Research Program of China [2015CB654700, 2015CB654703]
- National Natural Science Foundation of China [51673065, U1462116, 51473050, 51333003]
- Natural Science Foundation of Guangdong Province [2014A030310435, 2014A030311051]
It is a significant but challenging task to simultaneously reinforce and functionalize diene rubbers. Inspired by sacrificial bonds, the authors engineer sacrificial hydrogen bonds formed by pendent urazole groups in crosslinked solution-polymerized styrene butadiene rubber (SSBR) via triazolinedione click chemistry. This post-crosslinking modification reveals the effects of the sacrificial bonds based on a consistent covalent network. The cage effect of the pre-crosslinked network facilitates the heterogeneous distribution of urazole groups, leading to the formation of hydrogen-bonded multiplets. These multiplets further aggregate into clusters with vicinal trapped polymer segments that form microphase separation from the SSBR matrix with a low content of urazole groups. The clusters based on hydrogen bonds, serving as sacrificial bonds, promote energy dissipation, significantly improving the mechanical properties of the modified SSBR, and enable an additional wide transition temperature region above room temperature, which endows the modified SSBR with promising triple-shape memory behavior.
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