ISSN:
1042-7147
Keywords:
Radiation
;
crosslinking
;
calorimetry
;
polymer-monomer composition
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
This work summarizes the results of a study of the mechanism of polymerization in monomer-polymer compositions initiated by ionizing radiation. Attention was mainly paid to the investigation of the polymerization directly in the γ-radiation field. The next monomers were chosen for monomer-polymer compositions: heptyl acrylate (HA), heptyl methacrylate (HMA) and some other acrylic and methacrylic monomers. The polymer components are: chlorinated polyethylene (CPE) (molecular mass Mn ≅ 1 × 105), chlorinated paraffins (CP) (molecular mass Mr ≅ 450), butadiene-nitrile rubber BN-1 (molecular mass Mw ≅ 3 × 105) and BN-2 (molecular mass Mw ≅ 2500). Compositions that are crosslinked (BN-1+HMA, BN-2+HMA, CPE+HA) and noncrosslinked under γ-radiation were specially selected. The dynamic of radiation polymerization in the system studied was measured by calorimetric technique. A calorimeter was situated directly in the zone of γ-ray60 Co. The dynamic of polymerization was followed by the heat release rate recorded by the calorimeter. Viscosity of the systems was measured on a rotational viscosimeter REOTEST-2 at room temperature. The investigations carried out have allowed us to establish the kinetic regularities of the radiation polymerization processes in the crosslinking and noncrosslinking compositions under irradiation based on HMA and some polymers. A comparison of the main characteristic of these processes was also made. The employment of the crosslinking and noncrosslinking polymers in the compositions significantly changes the radiation polymerization dynamics and allows the construction of the composites at the molecular level to be changed. The results obtained may serve as a basis for choosing the optimal system for producing-radiation-cured monomer-polymer compositions.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
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