The direct conversion of 6‐aminocaproic acid vapor into polymer single crystals

Macchi, E. M.

doi:10.1002/macp.1973.021650127

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1976

1980

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Extended chain crystals of monoclinic nylon 11

Macchi

Giorgi²

1980

Makromol. Chem., Rapid Commun.

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In a recent communication ') we have reported on chemical and crystallographic results concerning the conversion of 1 I-aminoundecanoic acid (m.p. 187 -180'C) to three-dimensionally oriented, polycrystalline aggregates of Nylon-I I . Since the process was carried out at temperatures between 30 and 40°C below the monomer's melting point it has been described as taking place in the crystalline, solid state. Subsequent experimental evidence2), however, showed that the reaction only proceeded when heated in a closed, evacuated system where the monomer vapor pressure had the opportunity to build up to equilibrium values. Heating in a continuously pumped vessel, on the other hand, resulted in sublimation of the monomer into the cool regions of the system without any conversion to polymer; and, reactions carried out in the presence of inert gases took place at substantially lower rates. The process, therefore, as in the case with 6-aminocaproic acid/Nylon-6 3, must have proceeded from the monomer vapor phase by a polymerization-during-crystallization mechanism.

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