Synthesis and photoreactions of polyesters containing triazene and cinnamylidene malonyl units

✍ Scribed by Nicola Hoogen; Oskar Nuyken

• Book ID: 101278158
• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 189 KB
• Volume: 38
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(20000515)38:10<1903::aid-pola780>3.0.co;2-q

✦ Synopsis

The synthesis and photoreactions of polyesters containing the photolabile triazene group (PhONANONR 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 Ͼ 395 nm enables selective photocrosslinking of the cinnamylidene malonyl ester units via [2ϩ2]-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 ϭ 308 nm and are therefore interesting candidates for applications using XeCl excimer laser ablation.