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Radicals formed from photoactivated dyes

Dye photoinitiated degradation of polymers is a phenomenon commonly known in industry as phototendering, and has been described in a number of pubhcations [49, 86, 1307, 1446, 1787, 1804]. [Pg.392]

A dye molecule (D) absorbs light and is excited to the excited singlet ( D) and/or triplet ( D) states (noted here as D )  [Pg.392]

In addition to transferring excitation energy to molecular oxygen to generate singlet oxygen 2) (cf section 7.3), the photoactivated dye molecule (D ) [Pg.392]

The photoactivated dye molecule (D ) may also abstract a hydrogen atom from a polymer (PH) molecule and produce a polymer alkyl radical (P ), which may react further with molecular oxygen and form a polymer peroxy radical (POO )  [Pg.393]

Polymer peroxy radicals react further with dye radical (DH ) and a polymer hydroperoxy group is formed  [Pg.393]

See other pages where Radicals formed from photoactivated dyes is mentioned: [Pg.392]    [Pg.393]    [Pg.395]    [Pg.392]    [Pg.393]    [Pg.395]    [Pg.183]   


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