Heat-Resistant Polymers with Intense, Visible Photoluminescence Functionality and Fluorescence Probing Application

Heat-resistant polymers with an intense, visible photoluminescence (PL) functionality are presented. A polybenzoxazole (PBO) containing hexafluoroisopropylidene (HFIP) side groups exhibited intense purple PL a quantum yield, ΦPL, of 0.22 (22%), owing to the effectively disturbed concentration quenching (CQ) in fluorophore units by bulky HFIP groups. The chain ends wholly cycloaliphatic polyimide (PI), derived from 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) and 4,4′-methylenebis(cyclohexylamine) (MBCHA), were modified conjugated monoamines. PI 2,3,6,7-naphthalenetetracarboxylic (2,3,6,7-NTDA) MBCHA very high glass transition temperature (Tg = 376 °C) fluorescence S1(π,π*) state. However, its ΦPL value was lower than expected. pronounced effect dilution using CBDA on enhancement observed. This is closely related planar structure 2,3,6,7-NTDA-based diimide units. By contrast, counterpart 2,3,6,7-NTDA isomer, 1,4,5,8-NTDA, virtually non-fluorescent, despite sufficient CBDA. film obtained 3,3″,4,4″-p-terphenyltetracarboxylic (TPDA) non-coplanar blue spectrum (ΦPL 0.26) peaking at 434 nm. approach enhanced up 0.41. Even when TPDA combined aromatic diamine, 2,2′-bis(trifluoromethyl)benzidine (TFMB), observed without charge-transfer fluorescence. semi-cycloaliphatic TFMB novel tetracarboxylic dianhydride, which hydrogenated trimellitic anhydride derivative 4,4′-biphenol, used as another host polymer for 9,10-bis(4-aminophenyl)anthracene (BAPA). BAPA-incorporating resulted significant considerably 0.48. also had relatively Tg (265 °C). reactive dye, N,N′-bis[4-(4-amino-3-methylbenzyl)-2-methylphenyl]-3,4,9,10-perylenetetracarboxydiimide, harnessed probe explore transamidation between precursors solution.