稀溶液中聚（4——乙烯基吡啶）的磁圆二色性与分子量的相关性

利用磁圆二色性（ＭＣＤ）对聚（４－乙烯基吡啶）（ＰＶＰ）分子量的相关性进行了研究。实验表明，ＭＣＤ谱中的法拉第参数Ｂ不象Ｄ那样受分子量影响很大。但Ｂ／Ｄ随分子量的增加而减小，且达到一定程度又随分子量的增加而缓慢增加，而Ｄ总是随分子量增加而增加，这是由于ＰＶＰ链上靠近的生色团之间有相互作用，Ｂ／Ｄ值的降低主要是由于生色团之间的相互作用增强所致。

MOLECULAR WEIGHT DEPENDENCE OF MAGNETIC CIRCULAR DICHROISM FOR POLY(4-VINYLPYRIDIN) IN SOLUTION

The molecular weight dependence of the magnetic circular dichroism(MCD) for poly(4-vinylpyridin) (PVP) has been studied by using the normalized dipolestrength D. The normlized MCD intensity B is not so much affected by the molecular weight as the normlized dipole strength D. The ratio of Faraday parameter to the dipole strength, (B/D) decreases as the molecular weight increase and then is constant above it. The increase of the normalized D with the increase of molecular weight is interpreted in terms of the closer approach of chromophores. These results indicate that MCD for PVP is influenced by the interaction of chromophores in a polymer chain. The decrease of B/D comes from the increase of the interaction of chrompohores.