Molecular Motion of Chain End Peroxy Radicals of Polyethylene Molecules Tethered on a Fresh Surface of Poly(tetrafluoroethylene)

Autor:	Yasuro Hori, Akihito Suzuki, Masato Sakaguchi, Shigetaka Shimada
Rok vydání:	1996
Předmět:	Ethylene Polymers and Plastics Chemistry Radical Organic Chemistry chemistry.chemical_element Polyethylene Oxygen Inorganic Chemistry chemistry.chemical_compound Monomer Polymer chemistry Materials Chemistry Copolymer Molecule Tetrafluoroethylene
Zdroj:	Macromolecules. 29:973-977
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma951139a
Popis:	Chain end peroxy radicals of polyethylene (PE) molecules tethered on a fresh surface of poly(tetrafluoroethylene) (PTFE) were produced in the following way. Ethylene monomer was block copolymerized by initiation of mechanoradicals formed by mechanical fracture of the PTFE powder. The propagating radical in the block copolymerization, −CH2CH2•, located on the fresh surface of PTFE was converted into peroxy radicals, −CH2CH2OO•, after introduction of oxygen molecules. Temperature−dependent ESR spectra of the peroxy radicals were successfully observed. The remarkable change with anisotropic g-values of the radicals was analyzed by computer simulation, and it was found that the PE peroxy radicals on the PTFE surface have extremely high mobility in comparison with the PE radicals on the PE surface and the PTFE radicals on the PTFE surface. This is a reflection of the properties of the protruding PE chains on the PTFE surface; i.e., interaction between PE chains from the PTFE surface must be much weaker than th...
Databáze:	OpenAIRE
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