DSC studies on hydrogen bonding of poly(4-hydroxy-3,5-dimethoxystyrene) and related derivatives.

Nakamura Kunio, Hatakeyama Tatsuko, Hatakeyama Hyoe

doi:10.1295/polymj.18.219

Poly(4-acetoxystyrene)(P_pAS), poly(4-acetoxy-3-methoxystyrene) (PAMS), poly(4-acetoxy-3,5-dimethoxystyrene) (PADMS), poly(4-hydroxystyrene) (P_pHS), poly(4-hydroxy-3-methoxystyrene) (PHMS), poly(4-hydroxy-3,5-dimethoxystyrene) (PHDMS) and partially hydrolyzed acetate polymers were prepared. The effects of hydrogen bonding on the glass transition temperature (T_g) and heat capacity (C_p) of the above polymers were studied by differential scanning calorimetry (DSC). The glass transition temperatures of partially hydrolyzed P_pAS and PAMS increased with the degree of hydrolysis. However, in the case of partially hydrolyzed PADMS, initially T_g increased with the degree of hydrolysis and then decreased with increasing hydrolysis. Thermal analysis of water sorbed on the polymers showed that the bound water content of PHDMS was larger than that of P_pHS and PHMS. Taking the bound water content as an indication of the hydrogen bonds of each polymer, it was ascertained that the molecular motion related to hydrogen bonding was effected by the chemical structure of each polymer.

DSC studies on hydrogen bonding of poly(4-hydroxy-3,5-dimethoxystyrene) and related derivatives.

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