Reaction of syndiotactic poly(methacrylic acid hydrazide) with functional carboxylic acids

✍ Scribed by R. Vartan-Boghossian; B. Dederichs; E. Klesper

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 693 KB
• Volume: 22
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(86)90209-0

✦ Synopsis

As a highly reactive tactic vinyl polymer, syndiotactic poly(methacrylic acid hydrazide) (s-PMH) was prepared from syndiotactic poly(methyl methacrylate) (s-PMMA) by hydrazinolysis. The s-PMH served as the starting polymer to prepare other tactic vinyl homopolymers having optically active functional carboxylic acids or N-protected amino acids as side chains. The condensation of the acids was carried out in water by water-soluble carbodiimides. Conversion was followed by pH and the resulting homopolymers characterized by ~H-and 13C-NMR spectroscopy. The NMR-spectra were assigned by comparison with low molecular weight model compounds, derived from pivalic acid hydrazide. In a third on-polymer reaction, the OH-groups present in the side chains of some of the polymers were employed for adding an optically active isocyanate to yield branched side chains.