AbstractPhototendering studies of poly(ethylene terephthalate) homopolymer yarn and a series of poly(ethylene terephthalate–co–4, 4′‐sulfonyldibenzoate) copolymer yarns have shown that photosensitized degradation occurs more readily in the copolymers than in the homopolymer. A photo‐oxidative mechanism involving the second monomer, dibutyl 4, 4′‐sulfonyldibenzoate, has been proposed to account for the photosensitization. The photophysical processes in the second monomer, dibutyl 4, 4′‐sulfonyldibenzoate, were studied by absorption and luminescence techniques. The lowest excited singlet and triplet in this compound were identified as the1(π, π*) and3(π, π*) states, respectively. The energy levels in the second monomer have been assigned as follows:1S1∼ 33,000 cm−1,1S2∼ 42,00
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