Abstract
The free radical propagation rate coefficient of 3- [tris(trimethylsilyloxy)silyl] propyl methacrylate was measured by pulsed- laser polymerization over the temperature range 288-323 K. The activation energy and pre-exponential factor were determined, by fitting the propagation data to the Arrhenius equation, as 19.9 kJ/mol and 1.44 x 106 1 mol-1 s- 1, respectively. This value for the activation energy is significantly less than that obtained for the lower alkyl methacrylates and is similar to that previously reported for dodecyl methacrylate. The Mark-Houwink-Kuhn-Sakurada (MHKS) values for poly(3-[tris(trimethylsilyloxy)silyl] propyl methacrylate) in tetrahydrofuran were also determined using size exclusion chromatography with on-line viscometry and refractive index detectors. The molecular weight- intrinsic viscosity distributions were measured for forty-four independent samples yielding MHKS constants of 1.67 x 10-5 dl/g and 0.74 for K and α respectively.
Original language | English |
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Pages (from-to) | 1441-1447 |
Number of pages | 7 |
Journal | Polymer |
Volume | 41 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Jan 2000 |
Externally published | Yes |
Keywords
- 3-[tris(trimethylsilyloxy)silyl] propyl methacrylate
- Propagation coefficient
- Pulsed-laser