摘要 : Blends of poly(cyclohexylmethacrylate), PChMA, with poly(vinylacetate), PVAc, were prepared by casting THF and chloroform solutions. A calorimetric and morphologic study was performed. Differential scanning calorimetry investigati... 展开 Blends of poly(cyclohexylmethacrylate), PChMA, with poly(vinylacetate), PVAc, were prepared by casting THF and chloroform solutions. A calorimetric and morphologic study was performed. Differential scanning calorimetry investigations of the blends show two glass transition temperature that give evidence of immiscibility. For polymer less flexible (PChMA) was observed an enhancement of T_g by 20 deg C approximately in blends of PVAc-rich composition. Epifluorescence microscopy, using PChMA labelled by copolymerization pirenylmethylmethacrylate, Py, shows also phase separation providing imaging of the distribution of PChMA in the different domains and in the matrix. Blends containing 80 percent wlw PChMA show a bicontinuous primary morphology suggesting a spinodal phase separation mechanism. The 50 and 20 percent PChMA samples show morphologies composed of PChMA-rich domains in a matrix composed by PVAc mainly. Blends with domain-matrix morphology present a higher T_g than pure homopolymer more rigid (PChMA) due to packing in microphases in matrix of more flexible polymer (PVAc). 收起