Geoffrey A. Lindsay

United States Department of the Navy

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Andrew P. Chafin

Naval Air Warfare Center Weapons Division

John D. Stenger‐Smith

Naval Air Warfare Center Weapons Division

Warren N. Herman

Physical Sciences (United States)

Ronald A. Henry

Naval Air Warfare Center Weapons Division

J M Hoover

Nemours Children’s Clinic

M. Joseph Roberts

Naval Air Warfare Center Weapons Division

Richard A. Hollins

Naval Air Warfare Center Weapons Division

R. Y. Yee

Naval Air Warfare Center Weapons Division

Paul Ashley

Eastman Dental Hospital

Kenneth J. Wynne

Virginia BioTechnology Research Park

Cooperative Institutions

Naval Air Warfare Center Weapons Division

Naval Air Warfare Center Training Systems Division

United States Department of the Navy

United States Navy

Naval Air Systems Command

DEVCOM Army Research Laboratory

University of California, Davis

University of Maryland, College Park

United States Army Combat Capabilities Development Command

University of Washington

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Nonlinear optical polymer with chromophoric main chain

Die Makromolekulare Chemie Rapid Communications (1990)

John D. Stenger‐Smith John W. Fischer Ronald A. Henry J M Hoover Geoffrey A. Lindsay

10.1002/marc.1990.030110401

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Citations (31)

Benzofuran-terminated infrared dyes and their electro-optic properties in guest–host polymers

Optical Materials (2011)

Andrew P. Chafin Matthew C. Davis William Lai Geoffrey A. Lindsay Dong Hun Park

Thermal Stability

Poling

Benzofuran

10.1016/j.optmat.2011.03.004

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Citations (10)

Energetic Polyoxetane Thermoplastic Elastomers: Synthesis and Characterization

Geoffrey A. Lindsay Mostafa A Talukder Robin A. Nissan Roxanne L. Quintana M. Hasting

Abstract : This report summarizes our work at the Naval Weapons Center developing improved polymeric binders for energetic materials during Fiscal Year 1987.

Thermoplastic elastomer

Characterization

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Citations (2)

Electro-Optic Properties Of New Nonlinear Side-Chain Polymers

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1990)

F. Ore L. Michael Hayden G. F. Sauter Peg L. Pasillas J M Hoover

A new Green's function method of analyzing Maker fringes from second-harmonic generation experiments was used to determine the nonlinear properties of corona-poled polymer films. Electro-optic properties were determined by fashioning the polymers into planar waveguides on silicon substrates and measuring the polarization rotation induced by the electro-optic effect. The two measurements were compared to test the applicability of the two-level model in the polymer system. Waveguide-loss measurements were performed on the same substrates by launching a guided wave via the prism method and monitoring the scattered light with a CCD video camera. Both guest-host and side-chain polymers were studied in this way. The advantages of the side-chain polymer over the guest-host polymer mixture are higher molar concentration of the nonlinear species, decreased mobility and greater overall film homogeneity.

Side chain

Waveguide

Prism

10.1117/12.962105

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Citations (1)

Second harmonic generation in Langmuir-Blodgett multilayers of stilbazolium chloride polyethers

Thin Solid Films (1989)

Brian L. Anderson J M Hoover Geoffrey A. Lindsay Brian Higgins Pieter Stroeve

Behenic acid

Absorbance

10.1016/0040-6090(89)90214-9

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Citations (35)

Dipolar Alignment in an Electric Field: Effect of Lattice Arrangement

The Journal of Physical Chemistry C (2008)

Andrew P. Chafin Geoffrey A. Lindsay

Monte Carlo calculations were carried out to elucidate the dependence of dipolar alignment in a strong electric poling field on the choice of lattice. It has been found that the lattice that provides the best alignment for a prolate-shaped chromophore is an offset tetragonal lattice (same as face-centered tetragonal), whereas the lowest-energy lattice is a non-offset tetragonal (primitive tetragonal) lattice arrangement.

Tetragonal crystal system

Lattice (music)

Empty lattice approximation

10.1021/jp7113048

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Citations (2)

Rapid techniques for the characterization of polymer materials for optical waveguides

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Andrew J. Guenthner Joni M. Pentony Geoffrey A. Lindsay

Techniques for the rapid evaluation of material properties of interest in the design of polymer integrated optical devices that have recently been developed in our laboratory are described. These include methods for determining optical loss and electrical resistivity. The use of the techniques is demonstrated with polyimide materials as an example. The level of precision that is reasonably attained from each technique is discussed, along with the relative merits of these techniques compared to other potential approaches to obtaining similar information.

Characterization

Optical materials

Integrated Optics

10.1117/12.564254

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Citations (3)

Diene Termonomer Type and EPDM Properties

Rubber Chemistry and Technology (1972)

Krishna C. Baranwal Geoffrey A. Lindsay

Abstract The objective of this work was to study the effects of the type of diene termonomer on properties, especially thermal stability and aging, of EPDM polymers. Five different EPDM polymers using ethylidene norbornene (ENB), butadiene (BD), dicyclopentadiene (DCPD), methyltetrahydroindene (MTHI), and 1,4-hexadiene (HD) as termonomers were made at equimolar unsaturation. The same sulfur/accelerator system was used for curing these polymers. In both gum and filled vulcanizates ENB-EPDM is the fastest curing. In gum stocks HD-EPDM is the slowest curing, but is faster than DCPD-EPDM in filled stocks. These polymers, except for BD-EPDM, have about the same initial crosslink densities. Crosslink density and crosslink type analyses indicate that butadiene units in BD-EPDM chains are blocked. For HD-EPDM, both in gum and filled vulcanizates, 50 per cent of original crosslinks are monosulfidic. The other four EPDM vulcanizates have a lower proportion of monosulfidic crosslinks. At 350° F aging temperature, both ENB and HD polymers have ∼65 per cent monosulfidic crosslinks and about the same energy-to-break values (Eb). However, the higher original monosulfidic crosslink content of HD-EPDM does not seem to offer any better aging than for other polymers. DCPD-EPDM at 350° F aging temperature has the same monosulfidic content but increases further at 550° F aging temperature. At 550° F aging temperature almost all the crosslinks are monosulfidic for these EPDM polymers but the total crosslink densities and Eb are very low presumably due to oxidative degradation. Thermogravimetric analysis in N2 shows that these vulcanizates decompose in 800-935° F temperature range. In air, this range is 750-935° F.

Dicyclopentadiene

EPDM rubber

Degree of unsaturation

Thermal Stability

Thermogravimetric analysis

Diene

Ethylene propylene rubber

10.5254/1.3544742

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Citations (16)

Electro-optic polymers [2]

Chemical & Engineering News (1996)

Paul Ashley Alex K.‐Y. Jen Geoffrey A. Lindsay Robert D. Miller N. Peyghambarian

Source

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Citations (0)

Sub-Tg relaxation behavior of corona-poled nonlinear optical polymer films and views on physical aging

Macromolecules (1992)

Geoffrey A. Lindsay Ronald A. Henry J M Hoover A. Knoesen Mohammad A. Mortazavi

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSub-Tg relaxation behavior of corona-poled nonlinear optical polymer films and views on physical agingGeoffrey A. Lindsay, Ronald A. Henry, James M. Hoover, Andre Knoesen, and Mohammad A. MortazaviCite this: Macromolecules 1992, 25, 19, 4888–4894Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/doi/10.1021/ma00045a010https://doi.org/10.1021/ma00045a010research-articleACS PublicationsRequest reuse permissionsArticle Views145Altmetric-Citations45LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

Corona (planetary geology)

10.1021/ma00045a010

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Citations (47)