Journal
COMPOSITES PART B-ENGINEERING
Volume 229, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109483
Keywords
M-POSS; Self-assembly morphologies; Epoxy resin; Flame retardancy; Mechanical properties
Funding
- National Natural Science Foundation of China [21975022, 22075020]
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The researchers successfully prepared ibuT7-Li-POSS nanoparticles with multiple morphologies and applied them to epoxy resin, significantly improving the mechanical properties and flame retardant properties of the epoxy resin.
Mitigating the fire hazards of epoxy resin (EP) and simultaneously improving mechanical properties have always been a goal pursued by polymeric scientists. Herein, we prepared a lithium-containing hepta-isobutyl-POSS (ibuT7-Li-POSS). The chemical structure of ibu-T7-Li-POSS was well characterized. Just via tuning the ethanol solution concentration, we can obtain zero-dimensional (0D) spherical nanoparticles, two-dimensional (2D) ultrathin mono-layer nanoflakes, three-dimensional (3D) multiple-layered lamellae and hexagonal petal-shaped micron-size crystal based on ibu-T7-Li-POSS. Regular macroscopic octahedron single crystal of ibu-T7-Li-POSS was analisized by single crystal X-ray diffraction. The prepared ibu-T7-Li-POSS was incorporated into EP to improve the mechanical properties and enhance the fire safety. When the ibu-T7-Li-POSS content was 1 wt%, the flexural strength of EP-1 was enhanced from 81.8 MPa of EP to 110 MPa. The incorporation of ibu-T7-Li-POSS can apparently decrease the dielectric constant and loss of EP nanocomposites. Moreover, when 5 wt% of ibu-T7Li-POSS was incorporated into EP, the reduction of peak of heat release rate (p-HRR), peak of smoke production rate (p-SPR) and peak of CO production rate (p-COP) reached to 34.1%, 38.6% and 40.6%, respectively. Therefore, our findings provide a considerable promotion for the facile preparation of low-dimensional environment-friendly nano-/micron-flame retardants based on metal-containing polyhedral oligomeric silsesquioxane (M-POSS) compounds.
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