Influence of solvents on photochemical processes in dissolved polymers

1 INFLUENCE OF SOLVENTS ON PHOTOCHEMICAL PROCESSES IN DISSOLVED POLYMERS 

A -dimethyl-2,6-xylidine (the spectrum for this is less accurate than the others)  

Photo-oxidized degradation of polymers in solution is highly complicated for the following reasons  

Kemula and Grabowska [334] on the other hand found o-benzoquinone and phenol in the products of benzene photo-oxidation by oxygen. These workers consider that the new band at 2780 A (Fig. 18) belongs to the 

Benzene peroxide may be more stable in solution since it is protected by the surrounding benzene molecules. The stability of peroxides in the series benzene—naphthalene—anthracene should increase with increasing resonance energy of the aromatic compound. The resonance energy of benzene is 36 kcal mole-1, that of naphthalene is 61 kcal mole-1 and that of anthracene is 83 kcal mole-1. Thus pure anthracene peroxide can be separated and stored for a long time [Refs. 91, 93, 96, 102, 241], whereas benzene peroxide exists only in situ and decomposes in all attempts at separation. The characteristic absorption band of anthracene peroxide also occurs at 2780 A and it may be assumed that the band is characteristic of the peroxides of cyclic hydrocarbons. 

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