INTERPOLYMER COMPLEX-FORMATION BETWEEN FORM-I HELICAL AND FORM-II HELICAL POLY(L-PROLINE) AND POLY(CARBOXYLIC-ACIDS)

Interpolymer complex formations between Form II helical poly (L-prolin e)[(PLP(II)] and Form I helical poly(L-proline)[PLP(I)] and poly(carbo xylic acids) such as polyacrylic acid(PAA), atatic polymethacrylic aci d(at-PMAA), and syndiotatic polymethacrylic acid( st-PMAA) have been s tudied by FT-IR X-ray diffraction, and light scattering measurements. It was found that the interpolymer complexes were formed via hydrogen bonding. The helical PLP(II)) formed polymer complex more favorably wi th PAA and at-PMAA having a disordered structure than wih st-PMAA havi ng a ordered structure. In contrast, the helical PLP(I) formed polymer complex more favorably with st-PMAA than with PAA and at-PMAA. In add ition, PLP(II) helix was destroyed on the complexation with PAA and at -PMAA, but the PLP(II) helix was perserved on the complexation with st -PMAA. However, the PLP(I) helix was all perserved on the complexation with poly(carboxylic acids). These findings could be explained in ter ms of molecular conformation of the complementary polymers associated with the complex formation.