Thermal Stability of Piperazine Block Copolymers
Previous publications discussed the thermal stability of a series of piperazine polyamides (1–4). In the case of the piperazine homopolymers, it was shown that methyl substitution of the piperazine rings effectively decreases their thermal stability in a vacuum. On the other hand, the presence of terephthaloyl moieties in the chain increases the thermal stability of the system in comparison with the polymers that have isophthaloyl moieties in their chains. An essentially random thermal breakdown was indicated from the nature of the volatile degradation products, the character of the rate curves, and the high activation energies.
KeywordsBlock Copolymer Thermal Degradation Number Average Molecular Weight Hydrogen Cyanide Medium Molecular Weight
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