Dr. David Martyn

Dr. David Martyn is an Associate Professor of Chemistry at Southwestern Oklahoma State University (SWOSU). He specializes in Organic Chemistry.

EDUCATION

1999 – B.S. Chemistry, Southern Nazarene University

2003 – M.S. Chemistry, University of Oklahoma

2006 – Ph.D. Chemistry, University of Oklahoma

2008 – Began teaching at SWOSU

RESEARCH

Development of Polymers Incorporating Functionalized Carbon Nanotubes 

Dr. David Martyn (Mentor)

Specific Aims:  The goal of this research is mechanical properties enhancement of polyimides thru incorporation of phenyl amine functionalized single-wall carbon nanotubes.  By incorporating functionalized SWNT (fSWNT) into the polymer chain as a comonomer we desire to imbue polyimides with the high tensile strength characteristics displayed by pristine SWNT. 

Background & Significance:  Due to their unique properties, such as high strength and low weight, carbon nanotubes have received significant attention in the scientific community.  Potential applications of these materials include the incorporation of functionalized SWNT (fSWNT) into polymers.  Synthesis of these fSWNT-polymers first required synthesis of appropriately functionalized SWNT: a goal achieved last year.  Phenyl amine fSWNT were produced in sufficient quantities to allow production of fSWT-polyimides on the gram scale. Incorporating fSWNT as an integral part of a polymer provides two main benefits. First, functionalization increases the dispersibility of nanotubes, which have a propensity to aggregate, or bundle together.  Functionalization keeps the nanotubes from bundling thereby allowing the desired interaction between SWNT and polymer giving these polymers physical characteristics superior to their standard analogues.  Secondly, functionalizing SWNT allows for the inclusion of fSWNT in the polymer as it is being produced.  In this manner, interaction between the polymer and the nanotube is maximized. 

Thus, using covalently functionalized SWNT, we achieve increased SWNT dispersibility and the ability to manipulate how and to what extent fSWNT and the polymer interact.  In this way it is possible to engineer SWNT-polymer materials and optimize desirable physical properties.  Using these methods, we endeavor to produce novel polyimides that display enhanced mechanical properties.  

Materials & Methods In order to generate functionalized SWNT in abundance we required a generic method of functionalization that allowed addition of various desirable groups.  Using methods found in the literature as well as developing new methods, it was possible to append phenyl amine functional groups to the carbon nanotubes (Figure 1).

The polymer system currently being explored is based on a polyimide and utilizes an phenyl amine functionalized SWNT that is incorporated into the polymer backbone as it grows (Figure 2).  In this synthesis a 4-aminophenyl functionalized fSWNT is added to a mixture of 4,4’-oxydianiline and pyromellitic dianhydride.  The latter two compounds are the standard monomers used to produce polyimides such as Kapton.   

CONTACT INFORMATION

Email: david.martyn@swosu.edu Office Number: CPP 205-B
Phone Number: 580-774-3114

TEACHING: BASIC COURSES

CHEM 1203 Gen Chem I
CHEM 1252 Gen Chem I Lab
CHEM 1303 Gen Chem II
CHEM 1352 Gen Chem II Lab

TEACHING: ORGANIC CHEMISTRY

CHEM 3013/3015 Org Chem I
CHEM 3111/3015L Org Chem I Lab
CHEM 4113/4115 Org Chem II
CHEM 4021/4115L Org Chem II Lab
CHEM 4013 Materials Chemistry

OTHER ACTIVITIES

AUG 2021-PRESENT
Chemistry Club Sponsor

RECENT PUBLICATIONS

Bigley AN, Harvey SP, Narindoshvili T, & Raushel FM. (2021 Sep 8). Substrate analogs for the enzyme-catalyzed detoxification of the organophosphate nerve agents Sarin, Soman, and Cyclosarin. Biochemistry.
PMID: 34494832
doi: 10.1021/acs.biochem.1c00361

Bigley AN, Narindoshvili T, & Raushel FM. (2020 Aug 25). A chemoenzymatic synthesis of the (Rp)-isomer of the antiviral prodrug Remdesivir. Biochemistry, 59(33), 3038-3043.
PMID: 32786401
doi: 10.1021/acs.biochem.0c00591

Bigley AN, Narindoshvili T, Xiang DF, & and Raushel FM. (2020 Mar 31). Stereoselective formation of multiple reaction products by the phosphotriesterase from Sphingobium sp. TCM1. Biochemistry, 59(12), 1273-1288.
PMID: 32167750
doi: 10.1021/acs.biochem.0c00089

Xiang DF, Bigley AN, Desormeaux E, Narindoshvili T, & Raushel FM. (2019 Jul 23). Enzyme-catalyzed kinetic resolution of chiral precursors to antiviral prodrugs. Biochemistry, 58(29), 3204-3211.
PMID: 31268686
doi: 10.1021/acs.biochem.9b00530

Bigley AN, Desormeaux E, Xiang DF, Bae SY, Harvey SP, Raushel FM. (2019 Apr 16). Overcoming the challenges of enzyme evolution to adapt phosphotriesterase for V-agent decontamination. Biochemistry, 58(15), 2039-2053.
PMID: 30893549
doi: 10.1021/acs.biochem.9b00097

Bigley AN, Xiang DF, Narindoshvili T, Burgert CW, Hengge AC, Raushel FM. (2019, Mar 5). Transition state analysis of the reaction catalyzed by the phosphotriesterase from Sphingobium sp. TCM1. Biochemistry, 58(9), 1246-1259.
PMID: 30730705
doi: 10.1021/acs.biochem.9b00041