期刊
ACS MACRO LETTERS
卷 8, 期 5, 页码 506-511出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.9b00083
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资金
- National Natural Science Foundation of China [51573167, 51873195]
- Zhejiang Provincial Natural Science Foundation of China [LQ18E030004]
Ring-opening polymerization of bifunctional benzoxazine has long been thought to produce a permanent network structure without reprocessing ability. Here, we demonstrate that surprising healability can be achieved by a controlled polymerization of an ortho-blocked bifunctional benzoxazine poly(C-o-hda). The cured resin possesses a cross linked structure, but can be deformed, remolded from crushed pieces or healed from mechanical damage. Based on a series of intensive experiments, we show that the healability can be explained by a dynamic bonding exchange mechanism between the phenoxy structures existing during the curing process. Moreover, we verify the possibility to heal the fatigue damaged poly(C-o-hda) based composite to extend its service life. Our study provides another dynamic covalent bond to synthesize healable polymers, offering a broad platform for combining healability and desired thermosetting features together.
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