Radiation-induced polymerization of glass forming systems. VI. Polymerization rate at higher conversion in binary systems
The effect of temperature and composition on the inflection point in the time-conversion curve and the saturated conversion was investigated in the gamma -radio-induced radical polymerization of binary systems consisting of a glass- forming monomer and a solvent. In the polymerization of completely homogeneous systems such as glycidyl methacrylate (GMA) -triacetin and hydroxyethyl methacrylate (HEMA) --propylene glycol systems, the time-conversion curve has an inflection point at polymerization temperatures between T/sub vm/(T/sub v/ of monomer system) and T/sub vp/ (T/sub v/ of polymer system). Such conversions at the inflection point changed monotonically between 0 and 100% in this temperature range. T/sub v/ was found to be 30 to 50 deg C higher than T/sub g/ (glass transition temperature) and a monotonic function of composition (monomer -- polymer -- solvent). The acceleration effect continued to 100% conversion above T/sub vp/, and no acceleration effect was observed below T/sub vm/. The saturated conversion in homogeneous systems changed monotonically between 0 and 100% for polymerization temperatures between T/sub gm/ (T/sub g/ of monomer system) and T/sub gp/(T of polymer system). T/sub g/ was also a monotonic function of composition. No saturation in conversion was observed above T/sub gp/ , and no polymerization occurred below T/sub gm/. In the polymerization of completely heterogeneous systems such as HEMA-dioctyl phthalate, no acceleration effect was observed at any temperature and composition. The saturated conversion was 100% sbove T/sub g/ of pure HEMA, and no polymerization occurred below this temperature in this system. (auth)
- Research Organization:
- Japan Atomic Energy Research Inst., Takasaki
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-009950
- OSTI ID:
- 4414286
- Journal Information:
- J. Polymer Sci., Polym. Chem. Ed., v. 11, no. 8, pp. 1811-1818, Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
Radiation-induced polymerization of glass-forming systems. V. Initial polymerization rate in binary glass-forming systems
Hairy nanoparticles by atom transfer radical polymerization in miniemulsion
Related Subjects
*GLYCOLS- CHEMICAL RADIATION EFFECTS
*METHACRYLIC ACID ESTERS- CHEMICAL RADIATION EFFECTS
*PHTHALATES- CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
GAMMA RADIATION
GLASS
ORGANIC OXYGEN COMPOUNDS
POLYMERIZATION
RADIATION CHEMISTRY
RADICALS
TEMPERATURE DEPENDENCE