2,3,5,6-tetramethyl-l, 4-phenylene diamine

The polyamic acids were prepared from 3,3 ,4,4-benzophenone dianhydride (sublimed) and 2,3,5,6-tetramethyl-l,4-phenylene diamine in Cold Label N,N-dimethyl formamide (DMF). All chemicals were obtained from Aldrich. A solution of the anhydride was added over 30 minutes to a solution of the amine with stirring under N2 at room temperature at a net concentration of 15% solids. In general, a slight (1%) excess of the anhydride was needed to give maximum viscosity. 

TMDA52,3,5,6-tetramethyl phenylene diamine 6FDA55,5"-(l,l,l-trifluoromethyl)ethylidene)bis-l,3 isobenzoftirandione PP05poly(2,6-dimethyl-l,4-phenylene oxide) temperature 25 °C for PTMSP and poly(4-methyl-l-pentyne) other polymers at 35 °C... 

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