Fluorescent Copolymers of N-Vinylcarb-Azole and Eu-Complexed Acrylic Acid as Anti-Falsification Packaging Materials
Europium complexes were excellent chromophores that exhibited intense fluorescence with a narrowspectral bandwidth (5-10 nm). But non-uniform blending or dispersion of complex resulted in phaseseparation, decomposition and inefficient energy transfer to reduce emission efficiency. The complexes werecovalently attached to the main chain of polymers, which improved film quality, thermal stability and solubility.Eu(TTA)2(AA)phen as europium complex monomer (ECM) was prepared by Eu3+coordinating with1,10-phenanthroline (phen), acrylic acid (AA) and 2-thenoyltrifluoroacetone (TTA). Fluorescent Polymer 1(P1, molar ratio for ECM/N-vinylcarbazole, NVK, 1/60) and Polymer 2 (P2, 1/30) were synthesized. Theemission wavelength of ECM in tetrahydrofuran (THF) was at 614nm. With the increasing of molar ratio ofEu in polymers, the emission peak of P2 in the 350-500 nm region in either film or THF was lower and one ofP2 at about 614 nm was higher compared to P1. Collective states of polymers in both film and THF had lesseffect on emission wavelength at 614 nm. Glass transition temperatures and thermal decomposition temperaturesof ECM, P2 and P1 were observed at 118, 174, 178 ℃ and 269, 250, 227℃, respectively, which showedthat they were high thermal stabilities. From the differential scanning calorimetry (DSC) curves of P2 and P1,no noticeable crystallization took place. The atomic force microscope (AFM) images of copolymers film revealedgood film quality to avoid phase separation. The big overlap between emission spectra of carbazoleand absorption spectra of Eu complex moieties raised effectively intramolecular energy transfer from carbazoleunit to europium ions and improved emission efficiency. It was desirable to prepare fluorescent inks containingP1 and P2 for anti-falsification packaging.
Wenguan Zhang Lian Qin Shengmin Zhao
Lab of Printing & Packaging Material and Technology-Beijing Area Major Laboratory,Beijing Institute of Graphic Communication.Beijing 102600, P.R.China
国际会议
The 17th IAPRI World Conference on Packaging(第17届世界包装大会)
天津
英文
150-154
2010-10-12（万方平台首次上网日期，不代表论文的发表时间）