RADIATION-INDUCED SOLID-STATE POLYMERIZATION OF RING COMPOUNDS

Journal Article · Sun Apr 01 00:00:00 EST 1962 · J. Polymer Sci.

DOI:https://doi.org/10.1002/pol.1962.1205816658· OSTI ID:4806386

Okamura, S; Hayashi, K; Kitanishi, Y

Ring compounds such as trioxane, BETA -propiolactone, diketene, and 3,3- bischloromethylcycloxabutane can be polymerized only in the solid state by gamma radiation. These ring compounds polymerize by a ring-opening, ionic mechanism to highly crystalline, high molecular weight, linear polymers. In general, the conversion vs irradiation time curves reach a limiting value at relatively low yield. These saturation phenomena are due to the disruption of unreacted monomer lattice by the formed polymer. The polymers obtained from large-monomer crystals are found to have outward appearances of large crystals which suggest the monomer crystalline lattice has influenced that of the polymer. Moreover, the polymers from large crystalline monomer have higher polymerization rate and better orientation of the crystallites, as ascertained through x-ray diffraction and polarizing microscopic analyses. Polarizing microscopic photographs of the polymers show birefringence clearly. These facts indicate that the structure of the monomer lattice directly imposes order and orientation upon the polymer. X- ray diffraction analyses show that the polydiketene chain has a spiral configuration and poly- beta -propiolactone has a planar zigzag chain. Some consideration of the propagation mechanism in the crystalline state of 3,3- bischloromethylcycloxabutene, beta -propiolactone, diketene, and trioxane is made. Investigations of the binary systems with beta -propiolactone were carried out to determine the effects of additives upon the propagation mechanisms. (auth)

• Research Organization: Japanese Assn. for Radiation Research on Polymers, Osaka
• NSA Number: NSA-16-023744
• OSTI ID: 4806386
• Journal Information: J. Polymer Sci., Vol. Vol: 58; Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ANISOTROPY
BIREFRINGENCE
CONFIGURATION
CRYSTALS
DIAGRAMS
DIFFRACTION
EFFICIENCY
ESTERS
GAMMA RADIATION
IONS
IRRADIATION
LACTONES
LATTICES
METHYL RADICALS
MICROSCOPY
MONOMERS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
PHOTOGRAPHY
POLARIZATION
POLYMERIZATION
POLYMERS
PROPIONIC ACID
RADIATION CHEMISTRY
REACTION KINETICS
REFRACTION
SOLIDS
TESTING
TRIOXANE
X RADIATION