Abstract
Solid-state cyclopolymerization of N-octadecyldimethacrylamide(ODMA) has been investigated in an attempt to clarify the effect of its long-chain substituent on the polymerization, as compared with the reported polymerization of N-substituted dimethacrylamides(RDMA) which have small substituents. The polymerizability of ODMA has been found to be higher than that of RDMA in the solid state, especially in the postirradiation polymerization, though the former is comparable with the latter in the solution polymerization. X-Ray diffraction studies have revealed that poly(ODMA) is a partially crystalline polymer, in contrast to the poly(RDMA) which is amorphous. However, the other results are similar to those obtained in the polymerization of RDMA, viz., the sigmoid time–conversion curve, higher polymerizability in the liquid state than in the solid state, structural characteristics of the polymer, and the fact that the rate-determining step of the solid-state polymerization of ODMA is an intramolecular cyclization reaction. Consequently, it has been suggested that the polymerization of ODMA proceeds under the influence of crystalline structure, probably due to the ordered arrangement originating from its long octadecyl group, but some destruction of the structure is necessary for the polymerization.
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Kodaira, T., Sakai, M. Cyclopolymerization. IX. Radiation-Induced Solid-State Polymerization of N-Octadecyldimethacrylainide. Polym J 11, 595–600 (1979). https://doi.org/10.1295/polymj.11.595
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DOI: https://doi.org/10.1295/polymj.11.595