STABILIZATION AND MODIFICATION OF CELLULOSE DIACETATE - Photochemical Reactions in Heterochain Polymers - page 50

highly mobile and easily undergo further transformations, method of electron-paramagnetic
resonance (ESP) is one of the most effective for these particles identification. Critical analysis
of a great number of works on EPR spectra interpretation is quite fully given in surveys [150-
152]. More than 20 different radicals are being formed at ultraviolet irradiation as a result of
break of practically all bonds C-C; C-H; C-O. Main types of macroradicals, with indication of
atom and groups of atoms after removal of which these macroradicals are formed, are
presented in scheme 1. Formation of five lowmolecular radicals: OH, CHO, H, CH 2 OH, CH 3 ,
is also marked here.

HP 1 O Singlet H=1.5-1.6 m T [73], g=2.0034 [80,81]
Doublet, H p =2.3-2.4 mT [79, 81];

HP 1 doublet, H p -4 mT [22], H p -5 mT [82]

P 1 O- Doublet, H p =1.7 mT [79], H p =2.6 mT,
g=2.0024 [76, 22], signal with H-6.5 m T [82]
___________________________________________
P 2 OH Triplet, H p =3.4-3.5 mT [79],
H p =3.1mT [76, 80, 81]
___________________________________________

HP 2 Doublet, H p =4.3 mT [83] _______________

HP 2 O Singlet, H p =1.5-1.6 mT [22]
___________________________________________

P 3 OH The sam e as for P 2 OH
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HP 3 Doublet, H p =4.3 mT [83], doublet, (1:1),
doublets, (1:1), H p =1.75 and 4.1 mT [76]
___________________________________________
H 3 PO Singlet [22]
___________________________________________
P 4 O- Triplet, H p =3.0-3.5 mT [79, 80], 3.1 mT,
g=2.0024 [76]
___________________________________________
HP 4 Triplet, H p =3.0-3.5 mT [80];
H=8.5 mT [82]
___________________________________________
HPO 4 Singlet, H=1.5-1.6 mT [79, 80]
___________________________________________
P 5 Triplet or quartette (?)[79], doublet (1:1)
trip lets (1:2:1 ) H p =5.2 and 1.0 mT [75],
trip let H p =3.0-3.5 mT [22]
___________________________________________
HP 5 Quartette, H p =8.8 mT [79]
___________________________________________
P 6 OH Triple t, H p =3.4-3.5 mT [79-81]
___________________________________________
HP 6 Triplet, H p =3.4-3.5mT [79];
doublet, H p =4.3mT [83]
___________________________________________

HP 6 O Singlet, H p =1.5-1.6 mT [22]

* The arrow indicates atom or groups of atoms, after splitting of which macroradical is formed:
* The index shows the number of atom C, on which valency is localized, or atom C, being the nearest to
the place of free valency localization.

Scheme 1.