期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 29, 页码 17498-17504出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta04951g
关键词
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资金
- Shandong Provincial Natural Science Foundation [ZR2018MB022]
- Key Technology Research and Development Program of Shandong [2017GGX20141]
- Jinan city Science and Technology Startup Enterprise Support Plan [201602102]
The introduction of reversible covalent bonds makes some thermosets reprocessable and degradable. However, the low temperature at which the reversible reactions occur severely limits heat-resistant properties of these thermosets, and their glass transition temperatures (T(g)s) rarely exceed 200 degrees C. We propose a novel way to cross-link the benzoxazine resin [poly(P-mdes)] via dynamic Si-O-Ph bonds. The results show that the dynamic Si-O-Ph bonds are reversible only at high temperature, which enables poly(P-mdes) to be a high heat-resistant thermoset with its T-g (tan delta) reaching 301 degrees C. This T-g is much higher than those of all the known reprocessable thermosets so far. Besides, poly(P-mdes) can be repeatedly reprocessed under hot pressing conditions, and still retains 74.0% of the original tensile strength, even after the fourth reprocessing procedure. Under acidic conditions (pH = 1), poly(P-mdes) is also degraded, and thus can be recycled.
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