Abstract
Complex formation between poly(acrylic acid) (PAA) or poly(methacrylic acid) (PMA) and three kinds of poly(propylene oxide) (PPO) or poly(vinyl methylether) (PVM) was studied. By addition of PMA in appropriate mixing ratios, the cloud point of a PPO solution increased or disappeared, and the effect was stronger with increasing molecular weight of PPO employed, despite the lower cloud point. By addition of PAA, however, the cloud point of PPO increased only a few degrees. The cloud point of a PVM solution also disappeared by addition of PAA or PMA in relevant conditions. The phenomenon may be explained by the extent of complex formation and the length of free PPO or PVM portions in the complex.
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