Phenyl Silicone Resin Applications

In this study, the poly-phenylsilsesquioxane(PPSQ) particles were synthesized by hydro lytic condensation of trimethoxysilane with basic as catalyst. The structure and perfo rmance of PPSQ was confirmed by SEM,29Si CP-MAS NMR, FT-IR spectroscopies, X-ray diffraction (XRD) and thermogravimetric analysis(TGA). the results indicated t hat PPSQ particles had a certain ordered structure,a narrow size distribution and hi gh thermal stability.In order to study the influence of PPSQ on the crystallization property and heat resistance of polypropylene(PP), PPSQ particles were mixed with PP by melt blendin g method. The SEM result showed that the particles were well dispersed in the PP matrix and the XRD revealed that the addition of PPSQ influences the crystallinity and crystal orientation of PP. The thermogravimetric analysis results of the PP/PPSQ composites indicated that the incorporation of PPSQ can improve the thermal stabilit y of PP. The Flynn-Wall-Ozawa method was employed to analyze the TGA data a nd the kinetic results showed that the apparent activation energy for PP/PPSQ comp osites were much higher than that of neat PP, suggesting that the PPSQ influences t he mechanisms of pyrolysis of PP.Besides, intumescent flame retardant(IFR) PP was prepared by using Melamine p olyphosphate(MPP) and Pentaerythrite(PER) as flame retardants and PPSQ as synergi stic agent. The effect of PPSQ particles content on flame retardancy and synergistic effect was characterized by Cone Calorimeter, TG, SEM and XPS.It was found that the PPSQ particles could catalyze the esterification reaction between MPP and PER,a nd increase the char residue. Especially, when the addition amount of PPSQ was 6 %,the flame retardant performance of materials was improved the most.