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Thermal Degradation of Piperazine Copolyamides

  • Stephen D. Bruck
  • Ashok Thadani
Conference paper

Abstract

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.

Keywords

Block Copolymer Thermal Degradation Number Average Molecular Weight Tungsten Lead Dimethyl Pyrazine 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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