Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 164, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2021.104920
Keywords
Hyperbranched benzoxazine; Epoxy; Thermal properties; Toughness
Funding
- National Natural Science Foundation of China [51773048]
- Natural Science Foundation of Heilongjiang Province [E2017022]
- Fundamental Research Funds for the Central Universities [3072020CF1001]
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [2017-16]
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A novel hyperbranched benzoxazine (HB-PED230) was synthesized and found to have significant plasticizing effect on epoxy resin, reducing its brittleness and improving toughness. The mechanical properties of modified thermosets were enhanced after adding HB-PED230, indicating a great improvement in toughness for epoxy resin.
In this study, a novel hyperbranched benzoxazine (HB-PED230) was synthesized from the reaction of Jeffamine D230, 1,1,1-tris(4-hydroxyphenyl)ethane and paraformaldehyde through the simple one-step Mannich condensation reaction. The characteristic structure of oxazine ring in HB-PED230 was confirmed by FTIR, 1H and 13C NMR and the corresponding degree of branching (DB) was calculated to be 0.51. The effects of HB-PED230 on the copolymerization behavior, thermal stability and mechanical properties of epoxy resin were studied. Compared with the neat epoxy resin, the flexural modulus of modified thermosets decreased obviously by increasing the amount of HB-PED230, indicating that the HB-PED230 had plasticization effect on epoxy resin and reduced its brittleness. Simultaneously, the flexural strength of copolymer was enhanced. More importantly, the impact strength of modified thermoset with the incorporation of 12 wt% HB-PED230 was improved by 247.4%, implying the great improvement of toughness for epoxy resin. Scanning electron microscope (SEM) imagines showed that no phase separation appeared in the thermosets, also revealing the evidence of increased toughness after addition of HB-PED230.
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