Nanofiller-Polymer Interactions At and Above the Glass Transition Temperature

摘要: Rheological data are reported for a series of fumed silica filled PVAc samples, using fillers different specific surface areas and treatments. Data at the glass transition temperature 45 C above Tg presented. The addition filler systematically increases Tg, all samples obey time-temperature superposition. However, normalized frequency plots loss modulus indicate that there is no change in dispersion transition, with only exception being modified covalently bonded polymer chains. Thus, contrary to expectations, an increase content or treatment has effect on relative shape relaxation time spectrum transition. At behavior observed. concentration major nonlinearity dynamic moduli vs. strain amplitude, higher reducing amplitude which nonlinear Specific treatments result changes factor versus relationship. These results suggest interfacial interactions strongly modify far-field respect chain entanglement slippage large strains.