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The effect of ion‐dipole interaction between lithium cations and oxygen atoms in poly(methyl methacrylate) (PMMA), which leads to the great enhancement of glass transition temperature (Tg), on the linear viscoelastic properties is studied using binary blends of PMMA and lithium trifluoromethanesulfonate (LiCF3SO3). The strong interaction at low temperature leads to the high modulus in the glassy region even near Tg. The interaction becomes weak as increasing the temperature. Consequently, the rheological terminal region is clearly detected without a marked enhancement of steady‐state compliance, although the zero‐shear viscosity increases by the LiCF3SO3 addition. The result indicates that the crosslinking due to the ion‐dipole interaction has a lifetime that decides the longest relaxation time. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 2388–2394

Mechanical and optical properties of polycarbonate (PC) containing p-terphenyl (p-tPh) are studied. It is found from the dynamic mechanical spectra that the addition of p-tPh greatly enhances the modulus in the glassy state due to the antiplasticizing effect. Moreover, p-tPh molecules dissolved in PC show marked intermolecular orientation correlation with PC chains during hot-stretching. As a result, p-tPh orients to the stretching direction accompanying the orientation of PC chains. Because p-tPh shows a high level of optical anisotropy, the oriented p-tPh molecules enhance the orientation birefringence. The enhancement of both modulus and optical anisotropy leads to a thinner retardation film, which will be a great benefit in the industry.

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