Two-photon photoinitiated cationic polymerization using near-ir light

Keywords

Microfabrication, Photopolymerization

Abstract

The quest for organic materials exhibiting high nonlinear optical (NLO) absorptivities has increased dramatically over the past several years. Two-photon absorption (TP A), a nonlinear absorption process, is the subject ofintense interest in the chemistry, photonics, and biological imaging communities. Several current and emerging technologies exploit the TPA phenomenon, including multi photon fluorescence imaging, optical power limiting materials, two-photon photodynamic cancer therapy and two-photon microfabrication. Emerging device technology such as microelectromechnical systems and integrated sensors are placing increased demands on the development of materials processing and fabrication techniques. In response, the characteristic three-dimensional (3-D) spatial resolution ofthe simultaneous two-photon absorption (TPA) process is being harnessed for 3-D photoinitiated polymerization, facilitated by the nonlinear properties associated with simultaneous absorption of two photons. Two-photon absorption, a nonlinear absorption process, can be defined as simultaneous absorption of two photons via virtual states in a medium. Near-IR twophoton induced cationic polymerization of epoxide and vinyl ether monomers using commercially available photoinitiator systems, previously employed in single-photon UV-visible photopolymerization, was accomplished here. Details of the formulations, laser system set up, and polymerization experiments will be presented. The final resulting microstructures were captured by optical and electron microscopies. The rates and volume shrinkages ofboth radical monomer systems and cationic monomer systems used in two-photon photopolymerization were also investigated using a computercontrolled mercury dilatometer.

Notes

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Graduation Date

2001

Advisor

Belfield, Kevin

Degree

Master of Science (M.S.)

College

College of Arts and Sciences

Department

Chemistry

Format

PDF

Pages

82 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0028717

Subjects

Arts and Sciences -- Dissertations, Academic; Dissertations, Academic -- Arts and Sciences

Accessibility Status

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