Light Scattering and Spectroscopic Studies of Polymerization Processes.
Abstract
During the thermal polymerization of monomers such as methyl methacrylate (MMA) or styrene, we have been able to investigate both the static and the dynamic properties of the polymer formed, i.e., polymethyl methacrylate (PMMA) or polystyrene, in terms of the molecular weight, the second virial coefficient, the radius of gyration, the translational diffusion coefficient and its corresponding equivalent hydrodynamic radius as well as estimated of the size (or molecular weight) distribution of the polymer in dilute solution; and in terms of the isothermal compressibility, the cooperative diffusion coefficient and a slow characteristic decay time which has sometimes been related to the self-diffusion coefficient in the semidilute solution regime. By combining a spectroscopic technique, such as Raman scattering, which can determine the polymer concentration non-evasively during the polymerization process, with laser light scattering, we have demonstrated a viable procedure for on-line monitoring of solution polymerization processes permitting us to investigate detailed macromolecular properties in solution polymerization kinetics. The same approach has been extended to examine the thermal polymerization of melt hexachlorocyclotriphosphazine and of hexachlorocyclotriphosphazene in 1,2,4-trichlorobenzene to form poly(dichlorophosphazene).
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA153407
Entities
People
- B. Chu
Organizations
- Stony Brook University