Synthesis of N-Phenylaminomethyl POSS and Its Utilization in Polyurethane

A new functional N-phenylaminomethyl POSS was synthesized by traditionally controlled hydrolytic condensation in one step reaction. The POSS structure was ascribed to a T10 and T12 derivative mixture as main component by varied characterization methods such as 1H NMR, 13C NMR, 29Si NMR, gel permeation chromatography (GPC) and matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI−TOF MS). Then based on this new POSS reacted with polyether diisocyanate, a series of POSS−PU composites with different POSS concentration was prepared and characterized. The POSS−PU composites showed no macrophase separation up to 52 wt % POSS concentration. The high resolution transmission electron microscopy (HRTEM) images of POSS−PU composites showed a well separated nanostructure of POSS with a typical phase size of 5−10 nm. A critical POSS concentration of 26 wt % was found by DMA, beyond which the POSS−PU showed a permanent network at high temperature. Tg and storage modulus of POSS−PU composit...