Reactions of free radicals in solutions

Dolgoplosk, B. A.; Erusalimskiĭ, B. L.; Kuren'gina, T.N.; Tinyakova, E. I.

doi:10.1007/bf00942904

Cited by 2 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These defects might be a trifluoromethyl side group instead of a fluorine atom, a missing side fluorine atom (side radical), double bonds, chain branching and so on. A mechanism for the retarding action of alien atomic groups and links on chain decay kinetics in depolymerizing polymers is proposed in [20]. The mechanism of polymer destruction by CO 2 laser radiation is not entirely the same as that of pyrolysis, but certain comparisons can be useful.…”

Section: Molecule Chain Defects Conjecturementioning

confidence: 99%

Ablation of polytetrafluoroethylene using a continuous CO₂laser beam

Tolstopyatov¹

2005

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The ablation of polytetrafluoroethylene (PTFE) is studied using a continuous CO2 laser beam of 30–50 W at a mean intensity of 0.05–50 MW m−2. The ablation products and changes in the target layer are examined using infrared spectroscopy, x-ray photoelectron spectroscopy, x-ray diffraction and electron microscopy. The main experiments were conducted with an unfocused beam of intensity 0.9–1.2 MW m−2. The radiation–polymer interaction characteristics were found to change appreciably as the ablation conditions are approached. Within the polymer layer, light scattering diminishes and true resonant light absorption increases. Two distinct polymer components, which differ primarily in their resistance to CO2 laser radiation, were found to exist under ablation conditions. The less stable component depolymerizes intensively, while the more resistant component is blown up into fibres by intense gas flow. The reasons behind this behaviour are discussed. Preliminary gamma irradiation of PTFE is found to have a significant influence on the laser ablation process.

show abstract

Section: Molecule Chain Defects Conjecturementioning

confidence: 99%

Ablation of polytetrafluoroethylene using a continuous CO₂laser beam

Tolstopyatov¹

2005

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The inhibiting efficiency substantially increases in the presence of oxygen; this may be due to oxidation of phenols to quinones, which retard chain propagation more appreciably. 59 According to the most popular viewpoint, 59,60 the inhibitory influence of hydroquinone is due to the easy abstraction of the active hydrogen atom from the phenol molecule giving rise to a phenoxyl radical.…”

Section: Specific Influence Of Phenolic Inhibitors On Homo-and Copoly...mentioning

confidence: 99%