Radiation polymerization of alkyl methacrylates in polymer–monomer compositions

✍ Scribed by D. P. Kiryukhin; I. M. Barkalov

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 794 KB
• Volume: 7
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199604)7:4<287::aid-pat523>3.0.co;2-4

✦ Synopsis

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 y-radiation field. The next monomers were chosen for monomer-polymer compositions: heptyl ac ylate (HA), heptyl methac ylate ( H M A ) and some other ac y l i c and methac y l i c monomers. The polymer components are: chlorinated polyethylene (CPE) (molecular mass M , 1 x Z@), chlorinated paraffins (CP) (molecular mass M , E 450), butadiene-nitrile rubber BN-1 (molecular mass M, E 3 x lo5) and BN-2 (molecular mass M, E 2500). Compositions that are crosslinked (BN-1+HMA, BN-Z+HMA, CPE+HA) and noncrosslinked under y-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 y-ray60Co. 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 H M A 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 seme as a basis for choosing the optimal system for producing radiation-cured monomer-polymer compositions.