Thermally stable polymers based on acetylene‐terminated adamantanes

Abstract

Abstract 1,3‐Diethynyl‐5,7‐dimethyladamantane, 1,3‐diethynyl‐5‐phenyladamantane, 1,3,5‐triethynyladamantane, and 3,3′‐diethynyl‐1,1′‐biadamantane, were synthesized and polymerized thermally at 210°C. The thermoset resins obtained were post‐cured at 300°C for 16 h to give materials that exhibited onsets of degradation (TGA) in air at 460–477°C and in helium at 460–485°C. The fully cured materials did not exhibit any detectable DSC transitions between 25 and 400°C. An attempt to thermally polymerize 1‐ethynyl‐3‐phenyladamantane was unsuccessful. © 1992 John Wiley & Sons, Inc.