THE KINETICS AND MECHANISM OF THE SOLID STATE POLYMERIZATION OF ACRYLAMIDE
Crystalline acrylamide exposed to gamma rays polymerizes after removal from the irradiation source for periods of many months. The molecular weight of the product increases by about the same factor as the polymer yield. At 25 deg C, the initial propagation rate coefficient is 2.6 x 10/sup 6/ times lower than in water solution. The kinetics of the reaction are consistent with biomolecular radical termination and intermediate between those expected for a uniform radical distribution and the radical growth in isolated"tracks" of the gamma rays, but electron spin resonance measurements indicate little decay of the radical concentration with time. In solid solutions of acrylamide and propionamide, which is isomorphous with the monomer, the polymer chain length is determined by chain transfer to propionamide. The high chain transfer efficiency of propionamide in solid solution is indicative of the restraints imposed on the direction of the chain growth by lattice forces. There is no appreciable chain transfer in solid solutions of acrylamide containing the non-isomorphous acetamide as the second component. (auth)
- Research Organization:
- Polytechnic Inst., Brooklyn
- NSA Number:
- NSA-14-014802
- OSTI ID:
- 4169003
- Journal Information:
- Makromolekueare Chemie (Switzerland), Journal Name: Makromolekueare Chemie (Switzerland) Vol. Vol: 34; ISSN MACEA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
STUDY OF RADIATION INDUCED SOLID STATE POLYMERIZATION. Annual Progress Report for February 1, 1958 to February 1, 1959
POLYMERIZATION IN SOLID SOLUTIONS OF ACRYLAMIDE IN PROPIONAMIDE