Thermal and mechanical properties of liquid‐like trisilanol isobutyl‐polyhedral oligomeric silsesquioxanes (POSS) derivative/epoxy nanocomposites

Abstract

Liquid‐like trisilanol isobutyl polyhedral oligomeric silsesquioxanes derivative (L‐POSS‐D) was synthesized with γ‐(2,3‐epoxypropoxy)propytrimethoxysilane (KH560) as corona and polyetheramine M1000 as canopy. Its structure and properties were characterized by FTIR, XPS, TGA and Rheology data. Epoxy nanocomposites with 0.0, 0.5, 1.0 and 2.0 wt% content of L‐POSS‐D were prepared. Tg of the nanocomposites improved 47.6°C higher than pure epoxy resin. Mechanical properties, including flexural strength and impact toughness, were improved markedly with L‐POSS‐D. The morphologies of impact fracture were studied by SEM. POLYM. COMPOS., 38:691–698, 2017. © 2015 Society of Plastics Engineers

A facile approach to prepare cage‐ladder‐structure phosphorus‐containing amino‐functionalized POSS for enhancing flame retardancy of epoxy resins

“…The 1 H-NMR spectra with DMSO-d 6 as solvent was recorded using a Bruker Avance 400 MHz NMR spectrophotometer. The 29 Si NMR spectra were acquired on a Bruker DMX 300 MHz NMR spectrophotometer. Chromium (III) acetylacetonate with a concentration of 1 wt% was used as a paramagnetic relaxation agent to promote the rapid relaxation of the 29 Si nucleus.…”

“…The 29 Si NMR spectra were acquired on a Bruker DMX 300 MHz NMR spectrophotometer. Chromium (III) acetylacetonate with a concentration of 1 wt% was used as a paramagnetic relaxation agent to promote the rapid relaxation of the 29 Si nucleus. The Fourier transform infrared (FTIR) spectroscopy was carried out with a Bruker Tensor-27 FTIR spectrometer at room temperature in the range of 4000-400 cm −1 .…”

“…14 Unlike most of the POSS preparation methods which employed catalyst (i.e., acid or base) in the hydrolytic condensation reaction, 17,18 no catalyst was employed in the synthesis of CLNH 2 -POSS, as the amino group in KH540 was alkaline, which could act as a catalyst. 1 H NMR, FTIR, 29 Si NMR, MALDI-TOF, and XRD tests have been carried out to investigate the chemical structure and aggregation structure of CLNH 2 -POSS. Figure S1 shows the 1 H NMR spectra of CLNH 2 -POSS.…”

“…The presence of the amino group was beneficial for the participation in the curing reaction with epoxy matrix during the preparation of the cured epoxy resins. The 29 Si NMR spectra of the CLNH 2 -POSS are shown in Figure S2. The signals at −63.8 to −73.4 ppm were ascribed to Si atoms of completely condensation.…”

Influence of liquid‐like polyhedral oligomeric silsesquioxanes derivatives structures on thermal resistance property of their epoxy nanocomposites

“…However, not all kinds of POSS possess great capacity with the epoxy matrix, and the nanoparticle of POSS may aggregate in the matrix. Fortunately, there are many ways to modify the surface property of nanoparticle , and fabricating nanoparticle into liquid‐like derivatives is an efficient method . The liquid‐like derivatives always have core, corona, and canopy structure.…”