Studies on the complex formation of syndiotactic poly(methacrylic acid) with complementary polymers through the hydrogen bonding신디오탁틱 폴리 메타크릴산과 상응하는 고분자와의 수소결합을 통한 복합체 형성에 관한 연구
Complex formations between syndiotactic poly(methacrylic acid) (st-PMAA) and poly(N-vinyl pyrrolidone) (PVP), and that between st-PMAA and polyethyleneoxide (PEO) through hydrogen bonding were studied by viscosity and potentiometry. Reduced viscosity ($\eta$red) was measured at various mole fraction of PVP or PEO with respect to a constant amount of st-PMAA. Observation shows a sharp minimum at the 1:1 mole ratio of st-PMAA : PVP or st-PMAA : PEO, which shows that the complexation becomes optimal and the complex has a compact structure in this case. Variation of pH also supports this conclusion. This is the case of the system of st-PMAA and PVP in water as well as in DMF. Also the complexation is much enhanced when the molecular weight of PVP is high. Meanwhile, the system of st-PMAA and PEO shows a little different behavior, i.e., this system does not form the complex in DMF and dose only in water. It is because the interaction st-PMAA with PEO is weaker than that with PVP.