PREPARATION, CHARACTERIZATION AND PROPERTIES OF GRADIENT POLYMER BLENDS - DISCUSSION OF POLY(VINYL CHLORIDE) POLY(METHYL METHACRYLATE) BLEND FILMS CONTAINING A WIDE COMPOSITIONAL GRADIENT PHASE/
Y. Agari et al., PREPARATION, CHARACTERIZATION AND PROPERTIES OF GRADIENT POLYMER BLENDS - DISCUSSION OF POLY(VINYL CHLORIDE) POLY(METHYL METHACRYLATE) BLEND FILMS CONTAINING A WIDE COMPOSITIONAL GRADIENT PHASE/, Macromolecular chemistry and physics, 197(6), 1996, pp. 2017-2033
We prepared several types of thick approximate to 200 mu m films of a
poly(vinyl chloride)/poly-(methyl methacrylate) (PVC/PMMA) gradient po
lymer blend, which contained a widely varied compositional gradient ph
ase, using a dissolution and diffusion method. We discussed the prepar
ation conditions by classifying those gradient blend films into 5 type
s based on the results of differential scanning calorimetry (DSC) meas
urements and found the optimum conditions for preparing the ideal grad
ient blend consisting of only one extremely wide compositional gradien
t phase. Further, the gradient structures, which were evaluated by the
results of DSC measurements, were confirmed by means of Fourier trans
form infrared/attenuated total reflection (FTIR-ATR). Finally, the ide
al blend was found to have significantly new or improved properties (e
.g. a large half-width of temperature of the dissipation factor tan de
lta) which cannot be observed in any PVC, PMMA homogeneously (that is
ordinarily) miscible blend or a laminate system.