Journal
CHEMICAL ENGINEERING JOURNAL
Volume 334, Issue -, Pages 1371-1382Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.11.104
Keywords
Hyperbranched polymers; Ionic liquid; Benzoxazine; Toughening
Categories
Funding
- National Natural Science Foundation of China [51403242, 51373200]
- Guangdong Key Laboratory of High Performance and Functional Polymer Materials [20151002]
- South-Central University for Nationalities [CZW16007]
- Student's Platform for Innovation and Entrepreneurship Training Program [XCX17027]
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A novel hyperbranched polymeric ionic liquid (HBP-AMIM(+) PF6(-)) was explored via a thiol-ene click reaction using thiol-ended hyperbranched polyesters (THBP) and 1-allyl-3-imethylimidazolium hexafluorophosphate (AMIMPF6). The effects of HBP-AMIM(+) PF6(-) on the curing behavior, mechanical properties and thermal stability of benzoxazine/epoxy thermosets were investigated. The gelation time and differential scanning calorimetry of non-isothermal analysis indicated that the addition of HBP-AMIM(+)PF6(-) significantly decreased the curing temperature of benzoxazine/epoxy thermosets. Simultaneously, the addition of HBP-AMIM(+)PF6(-) also improved the strength, toghness and thermal properties of benzoxazine-epoxy thermosets. The addition of 3 wt% HBP-AMIM(+) PF6(-) -2 could significantly improve the mechanical and thermal performance of thermosets compared with that of cured neat benzoxazine/epoxy resin. The tensile strength, tensile toughness, flexural strength and flexural modulus, impact strength of the thermosets were improved by about 76.6%, 279.3%, 57.8%, 22.3% and 80.4%, respectively, compared with those of cured neat resin. The toughening mechanisms was attributed to the in situ reinforcing and toughening mechanism.
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