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Thermal stability of coatings used on specialty optical fibers is assessed via thermogravimetry (TG). The coating lifetimes are evaluated by analyzing dynamic TG curves and assuming a particular level of mass loss as a failure criterion. The studied coating systems include single and dual acrylate, fluorinated acrylate, epoxy, epoxy acrylate, silicone, silicone acrylate, silsesquioxane acrylate and...
It has been shown that in many cases, the addition of nanoscale metal oxide fillers to polymers leads to an improvement in dielectric breakdown strength at room temperature. However, in some cases electrical insulation is exposed to elevated temperatures. A thermally stable polymer material, such as polyamideimide (PAI), is desired for these applications. For this reason, breakdown strength measured...
A series of the polyimide-silica NLO nanohybrid materials were synthesized from 3,3', 4,4'- Bisphenyltetracarboxylic (BPDA), 2,2-Bis(3-amino-4-hydroxyphen-yl) hexafluoropropane (6FHP), nonlinear optical (NLO) molecule 4-(N-2-Hydroxyethyl-N-methylamino)-4'-[(6-nitroben-zothiazol-2-yl)-diazenyl] azobenzene (HNBDA), coupling agent APTES and hydrolysate of TEOS via sol-gel process. The TEOS contents in...
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