{'fraction_non_alphanumeric': 0.016423357664233577, 'fraction_numerical': 0.008211678832116789, 'mean_word_length': 6.032051282051282, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Synthesis and photoreactions of polyesters containing triazene and cinnamylidene malonyl units

The synthesis and photoreactions of polyesters containing the photolabile triazene group (Ph-N=N-NR 2 ) as well as photocrosslinkable units based on substituted cinnamylidene malonyl moieties are reported. The polyesters were obtained by reacting a triazene containing difunctional alcohol with different substituted cinnamylidene malonic acid dichlorides. Irradiation at A > 395 nm enables selective photocrosslinking of the cinnamylidene malonyl ester units via [2 + 2] π-cycloaddition without affecting the triazene units. The photocrosslinking reaction of the triazene containing polyesters as well as triazene-free reference polyesters were investigated by UV and IR spectroscopy. After selective photocrosslinking the irradiated polymers became insoluble and no longer exhibited a T g below decomposition temperature. The crosslinked triazene containing polyesters show strong absorption at A = 308 nm and are therefore interesting candidates for applications using XeCl excimer laser ablation.