Thermal Degradation of Piperazine Copolyamides

  • Stephen D. Bruck
  • Ashok Thadani
Conference paper


The thermal degradation of piperazine copolyamides was studied by both programmed and isothermal techniques with a Cahn RG Electrobalance® using a modified hangdown tube and thermocouple assembly. Experiments were carried out with block copolymers of terephthaloyl trans-2,5-dimethylpiperazine / isophthaloyl trans-2,5-dimethylpiperazine (abbreviated as t-2,5-DiMePipT / t-2,5-DiMePip-I), terphthaloyl trans-2,5-dimethylpiperazine / sebacyl trans-2,5-dimethylpiperazine (abbreviated as t-2,5- DiMePip-T / t-2,5-DiMePip-10), and isophthaloyl trans-2,5-dimethylpiperazine / sebacyl trans-2,5-dimethylpiperazine (abbreviated as t-2,5-DiMePip-I/t-2,5-DiMePip-10). In contrast to the previously studied homopoljrmers, the activation energies (range 44 to 61 kcal/mole), rates of volatilization, and half-life values are influenced by the molecular weights of the block copoljrmers. In general, the data indicate a random degradation process during isothermal pyrolysis in a vacuum. The exception is the block copolymer of t-2,5-DiMePip-I/t-2,5-DiMePip-10, which shows the competing effect of hydrolytic processes.


Block Copolymer Thermal Degradation Number Average Molecular Weight Tungsten Lead Dimethyl Pyrazine 
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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • Stephen D. Bruck
    • 1
  • Ashok Thadani
    • 1
  1. 1.Chemical Engineering DepartmentThe Catholic University of AmericaUSA

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