Journal article
Polymer crystallization/melting induced thermal switching in a series of holographically patterned Bragg reflectors
Soft matter, v 1(3), pp 238-242
28 Aug 2005
PMID: 32646080
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Holographic photopolymerization (H-P) is a simple, fast and attractive means to fabricate one-, two- and three-dimensional complex structures. Liquid crystals, nanoparticles and silicate nano-plates have been patterned into submicron periodical structures. In this article, we report fabrication of a one-dimensional reflection grating structure by patterning a semicrystalline polymer, polyethylene glycol (PEG), in Norland resin (thiol-ene based UV curable resin) matrix using the H-P technique. Sharp notches observed in the reflection grating of this Norland/PEG system indicate a finite An present in the system due to spatial segregation of the PEG and Norland resin. The notch position red shifts upon heating and the diffraction efficiency (ratio between diffraction and incident light intensity, DE) increases from -20% to 60% for the Norland 65/PEG 4600 grating. This dynamic behavior of the reflection grating is also fully reversible. The unique thermal switching behavior is attributed to the melting/formation of PEG crystals during heating/cooling. By employing different molecular weight PEGs which have different melting temperatures, a series of switching temperatures have been achieved. Since PEG can be easily coupled with a variety of functional groups, this research might shed light on fabricating multifunctional Bragg gratings using the H-P technique.
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Details
- Title
- Polymer crystallization/melting induced thermal switching in a series of holographically patterned Bragg reflectors
- Creators
- Christopher Li - Drexel UniversityMichael Birnkrant - Drexel UniversityLalgudi Natarajan - Science Applications International CorporationVincent Tondiglia - Science Applications International CorporationPamela Lloyd - UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432, USARichard Sutherland - Science Applications International CorporationTimothy Bunning - Wright-Patterson Air Force Base
- Publication Details
- Soft matter, v 1(3), pp 238-242
- Publisher
- Royal Society of Chemistry
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000233194100008
- Scopus ID
- 2-s2.0-26244445350
- Other Identifier
- 991019168331604721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Physics, Multidisciplinary
- Polymer Science