Copolymerization of trioxane by γ-radiation

Autor: S. Rösinger, H. Hermann, K. Weissermel
Rok vydání: 1967
Předmět:
Zdroj: Journal of Polymer Science Part A-1: Polymer Chemistry. 5:183-192
ISSN: 1542-9350
0449-296X
DOI: 10.1002/pol.1967.150050117
Popis: High molecular copolymers of trioxane with different cyclic ethers and formals were produced by γ-radiation from a 60Co source. It was polymerized in the solid state at 53°C. Polymerization does not occur in the melt. Irradiation was carried out with exclusion of air at a dose rate of 7 × 103 rad/hr. The polymerization rate was increased very considerably in the presence of 1,3-dioxolane and epichlorhydrin; the addition of other comonomers may reduce the yield. The concentration of the comonomer is generally higher in the polymer than in the initial mix. These comonomers which increase the polymerization rate are introduced preferentially into the polymer chain; this is proved by the unstable polymer part and the thermal stability. Experiments with the trioxane–1,3-dioxolane system revealed that the unstable polymer part is markedly reduced and the heat stability considerably inproved with rising concentrations of this monomer. The thermal stability and the reduced viscosity of these copolymers are within the range of technical processability.
Databáze: OpenAIRE
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