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Does bimolecular termination dominate in benzoyl peroxide initiated styrene free-radical polymerization?
- Source :
- Polymer. 189:122184
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- It is believed that polymer chains mainly terminate through bimolecular termination in free-radical polymerization, however, there is few convincing evidence to support it. In benzoyl peroxide (BPO) initiated styrene free-radical polymerization, our studies demonstrate that polymer chain terminates dominantly through primary radical termination rather than by bimolecular termination as described in polymer textbooks. Even at very high primary radical concentration or at very low monomer concentration, primary radical termination still dominates (FPRT&CTI>70%) besides the occurrence of some bimolecular coupling terminations. Two kinds of model polymers were prepared, one for bimolecular coupling termination, and the other for primary radical termination. The 1H-, 13C-, DEPT135-, and 2D HSQC NMR spectra of the polystyrene initiated by BPO are almost the same as those of the model polystyrene for primary radical termination, but they are quite different from those of the model polystyrene for bimolecular coupling termination, demonstrating directly that primary radical termination rather than bimolecular coupling termination dominates in BPO-initiated styrene free-radical polymerization.
- Subjects :
- chemistry.chemical_classification
Polymers and Plastics
Organic Chemistry
Radical polymerization
macromolecular substances
02 engineering and technology
Polymer
Benzoyl peroxide
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
0104 chemical sciences
Styrene
chemistry.chemical_compound
Monomer
chemistry
Polymerization
Materials Chemistry
medicine
Polystyrene
0210 nano-technology
medicine.drug
Subjects
Details
- ISSN :
- 00323861
- Volume :
- 189
- Database :
- OpenAIRE
- Journal :
- Polymer
- Accession number :
- edsair.doi...........d96a04906122a51a4ad95ac3709df774