Abstract
AbstractThe high molecular weight polymer of α‐piperidone, which had been unobtainable with the use of alkali metal, trialkyl aluminum, or Grignard reagent as catalyst, was prepared with M–AlEt3, (where M is alkali metal), MAlEt4 or KAlEt3 (piperidone) as catalyst and N‐acyl‐α‐piperidone as initiator. From the determination of the behavior of the solution viscosity of poly‐α‐piperidone in m‐cresol at 30°C. the value of 0.27 for the Huggins constant was obtained. Examination of the correlation between the number‐average molecular weight, determined by endgroup titration, and the intrinsic viscosity gave a somewhat small value for the endgroup COOH. This may be considered due to the consumption of N‐acyl‐α‐piperidone by a propagating polymer in the course of polymerization. The thermal stabilities of the polyamides, nylons 4, 5, and 6, was in the order nylons 6 > 5 > 4 according to differential thermal and thermogravimetric analyses, Poly‐α‐piperidone, which has a reduced viscosity of 0.7, shows a melting point of 270°C.. which was expected from the zigzag pattern of the correlation between melting points and numbers of CH2 groups for polyamino‐acid polymers.
Published Version
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