Urethane substituted polydiace: Synthesis and characterization [4, 6-decadiyn-1, 10-diol-bis(n-butoxy-carbonyl-methyl-urethane)]

Abstract

A diacetylene having 3-methyl-n-butoxy-carbonylmethyl-urethane (3BCMU) as a substituent was synthesized and exposed to 60Co-γ ray at various doses to obtaina polymer, poly3BCMU. The polymers obtained at low doses were of fairly high molecular weight and narrow distribution and those athigh doses were of relatively low molecular weight and broad distribution. Changes in color of high and low-dose samples in CHCl3 and n-hexane were compared.The critical solvent compositions (CHCl3 content) at which yellow-to-blue or blue-to-yellow changes occurred were independent of polymerconcentration but varied with molecular weight and temperature. Visible absorption spectra and Raman spectra were compared for yellow CHCl3 and blue CHCl3/n- hexane solutions of a high dose sample. Non-Newtonian intrinsic viscosities of these solutions were also compared. The results all suggested that poly3BCMU assumes a more extended, planar conformation in a poor solvent CHCl3/n-hexane than in a good solvent CHCl3, in contrast to flexible polymers in these solvents. © 1982, The Society of Polymer Science, Japan. All rights reserved.