Complications in the 355 nm pulsed-laser polymerization of N-vinylcarbazole
Yin, M., Barner-Kowollik, C., Heuts, J. P. A., & Davis, T. P. (2001) Complications in the 355 nm pulsed-laser polymerization of N-vinylcarbazole. Macromolecular Rapid Communications, 22(13).
The propagation kinetics of N-vinylcarbazole (NVC) were carefully investigated via the IUPAC-recommended pulsed-laser polymerization/size-exclusion chromatography technique (PLP-SEC) in the temperature range between -20 and 20 °C using 355 nm pulsed irradiation and the photo initiator 2.2-dimethoxy-2-phenylacetophenone (DMPA) as a source of primary radicals. Using this experimental approach, propagation rate coefficients, kp, were not accessible for temperatures exceeding 20 °C. There is strong evidence that the monomer itself is excited by pulsed-laser light of 355 nm, thus contributing to the polymerization process via the formation of free radicals. In addition, UV light-induced cationic polymerization processes can not be ignored as a possible side reaction. NVC polymer also absorbs strongly at 355 nm and we speculate that this may lead to bond scission and branch network formation in the PLP process. Laser-controlled molecular weight distributions are only obtained for reaction temperatures below 20 °C. The apparent Arrhenius parameters, EA, and A, are 22.8 kJ · mol-1 and 3.6 x 107 L · mol-1 · s-1, respectively. These results are divergent from recent literature data.
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|Item Type:||Journal Article|
|Additional Information:||Cited By :6
Export Date: 5 September 2016
Correspondence Address: Davis, T.P.; Ctr. for Adv. Macromolecular Design, Sch. of Chem. Eng./Indust. Chemistry, University of New South Wales, Sydney, NSW 2052, Australia; email: email@example.com
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|Keywords:||acetophenone derivative, carbazole derivative, n vinylcarbazole, polymer, radical, unclassified drug, article, chemical analysis, chemical reaction, gel permeation chromatography, irradiation, kinetics, polymerization, pulsed laser polymerization, reaction analysis, temperature dependence, temperature sensitivity|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||22 Sep 2016 04:50|
|Last Modified:||22 Sep 2016 04:50|
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