Development of High School Chemical Activities with Oligo(L-lactic Acid)

• FUJITA Masanori

  The Joint Graduate School in Science of School Education, Hyogo University of Teacher Education

• KITA Masakazu

  Graduate School of education, Okayama University

Bibliographic Information

Other Title

• オリゴL-乳酸を用いた高等学校化学教材の開発
• オリゴ L-ニュウサン オ モチイタ コウトウ ガッコウ カガク キョウザイ ノ カイハツ

Abstract

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.

Journal

• Journal of Science Education in Japan

  Journal of Science Education in Japan 36 (1), 77-82, 2012

  Japan Society for Science Education

Keywords

• oligo (L-lactic acid)
• optical activity
• high school chemistry
• effective lesson activities

Details

• CRID: 1390001205750531072
• NII Article ID: 110009431160
• NII Book ID: AN00036978
• DOI: 10.14935/jssej.36.77
• ISSN: 21885338
• ISSN: 03864553
• NDL BIB ID: 023641733
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023641733
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed