オリゴL-乳酸を用いた高等学校化学教材の開発
2012 年 36 巻 1 号 p. 77-82
詳細
2012 年 36 巻 1 号 p. 77-82
Lactic acid is often taught as one of representative substances of optical isomers. Poly-lactic acid is also taught as an example of biodegradable plastics. We examined the appropriateness and effectiveness of combining these two topics for high school chemistry. Heating of L-lactic acid produces oligo (L-lactic acid) and the generated oligomer shows a relatively larger optical rotatory polarization than the monomer. The magnitude of the optical rotatory corresponds to the progress of polymerization. The degree of polymerization is determined by neutralization titration which shows a number average molecular weight.
