A novel hyperbranched polyester acrylate used for microfabrications

作者：Kou HG; Asif A; Shi WF^*; Jiang ZW; Huang WH

来源：Polymers for Advanced Technologies, 2004, 15(4): 192-196.

DOI：10.1002/pat.462

• two-photon absorption (TPA)
• photopolymerization
• hyperbranched
• polyester acrylate
• oligomers

A novel hyperbranched polyester acrylate (HPEA) was synthesized based upon ethylenediamine tetraacetic acid as a "core" molecule, 5-hydroxyisophthalic acid as an AB(2) monomer, and 2-hydroxyethyl acrylate as an endcapping reagent. The obtained oligomer has an unsaturation concentration of 4.10 mmol(C=C) g(-1) measured by nuclear magnetic resonance and a wide molecular weight distribution of 1.64 measured by gel permeation chromatography. The two-photon absorption (TPA) photopolymerization of HPEA under the exposure of a Ti: sapphire femtosecond laser with a wavelength of 800 nm was investigated through laser exposure dose-dependant spatial resolutions of its resins. The TPA photopolymerization thresholds at the range 1.6-4.3 x 10(7) mJ cm(-2), and exposure dose windows at the range 3.4-4.3 for three formulations were determined. A spatial resolution of 0.85 mum was obtained through the TPA photopolymerization of the formulation containing 1 wt% photoinitiator and 0.3 wt% photoinhibitor. A diffraction grating and real three-dimensional coupled gear wheel created by TPA photopolymerization were described to demonstrate the unique capability of HPEA in microfabrications.

• 出版日期2004-4
• 单位中国科学技术大学