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Timothy Long

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Faculty w/Admin Appointment, TEMPE Campus, Mailcode 5001
Center Director & Professor
Faculty w/Admin Appointment, TEMPE Campus, Mailcode 5001

Tim Long is the center director of the Biodesign Center for Sustainable Macromolecular Materials and Manufacturing. He earned his B.S. in chemistry from St. Bonaventure University (New York) and conducted his doctoral studies at Virginia Tech.

Long will lead the integration of fundamental research in novel macromolecular structure and polymerization processes with the development of high-performance macromolecules for advanced technologies, taking full advantage 3D printing techniques to drive sustainable production of unprecedented material designs. This work is expected to impact drug delivery, sustainable feedstocks, stimuli-responsive polymers, adhesives and elastomers using the techniques of block copolymers, engineering polymers, controlled polymerization, and biomaterials needed for improving health and energy storage and production. The Biodesign Center for Sustainable Macromolecular Materials and Manufacturing will maintain a focus on the principles of green chemistry utilizing click chemistry for efficient functionalization, solvent-free polymerization processes, design of degradable polymers, and development of sustainable precursors for polymer production.


  • Ph.D., Chemistry, Virginia Tech, Blacksburg, VA. 1987 
  • B. S., Chemistry, St. Bonaventure University, Olean, NY. 1983

Hamachi, L.S.; Rau, D.A.; Arrington, C.B.; Sheppard, D.T.; Fortman, D.J.; Long, T.E.; Williams, C.B.; Dichtel, W.R.  Dissociative Carbamate Exchange Anneals 3D Printed Acrylates.  ACS Appl. Mater. Interfaces.  2021 13, 32, 38680-38687

Liu, B.; Chen,X.; Spiering, G.A.; Moore, R.B.; Long, T.E.  Quadruple Hydrogen Bond-Containing A-AB-A Triblock Copolymers: Probing the Influence of Hydrogen Bonding in the Central Block.  Molecules 2021 26, 15, 4705

Lopez de Pariz, X.; Jara, E.C.; Zivic, N.; Ruipérez, F.; Long, T.E.; Sardon, H.  Novel imino- and aryl-sulfonate based photoacid generators for the cationic ring-opening polymerization of ε-caprolactone.  Polymer Chemistry.  2021 12, 4035-4042

Long, T.E.  Asking our early career researchers to envision the future.  Polymer International.  2021 70, 7, 883-884

Arrington, C.B.; Hegde, M.; Meenakshisundaram, V.; Dennis, J.M.; Williams, C.B.; Long, T.E.  Supramolecular Salts for Additive Manufacturing of Polyimides.  ACS Appl. Mater. Interfaces.  2021 13, 40, 48061-48070

Wilts, E.M.; Long, T.E.  Sustainable additive manufacturing: predicting binder jettability of water-soluble, biodegradable and recyclable polymers.  Polymer International2021 70, 7, 958-963

Chatham, C.A.; Long, T.E.; Williams, C.B.  Process-structure–property relationships following thermo-oxidative exposure of powder bed fusion printed poly(phenylene sulfide).  MRS Communications2021

Wolfgang, J.D.; White, B.T.; Long, T.E.  Non-isocyanate Polyurethanes from 1,1′-Carbonyldiimidazole: A Polycondensation Approach.  Macromolecular Rapid Communications2021

Arrington, C.B.; Rau, D.A.; Vandenbrande, J.A.; Hegde, M.; Williams, C.B.; Long, T.E.  3D Printing Carbonaceous Objects from Polyimide Pyrolysis.  ACS Publications.  2021 10, 4, 412-418

Mondschein, R.J.; Hostetler, J.; Arrington, C.B.; Long, T.E.  Hydroxyethylresorcinol- and hydroxyethylhydroquinone-containing poly(ethylene terephthalate) copolymers.  Polymer2021 228

Scott, P. J.; Meenakshisundaram, V.; Chartrain, N. A.; Sirrine, J. M.; Williams, C. B.; Long, T. E.  Additive Manufacturing of Hydrocarbon Elastomers via Simultaneous Chain Extension and Crosslinking of Hydrogenated Polybutadiene Oligomers.  In Progress.

Arrington, C.B.; Rau, D.A.; Williams, C.B.; Long, T.E.  UV-assisted direct ink write printing of fully aromatic Poly(amide imide)s: Elucidating the influence of an acrylic scaffold.  Polymer2021 212.

Wolfgang, J.D.; Reynolds, K.J.; Arrington, C.B.; Odle, R.R.; Nazarenko, S.I.; Long, T.E.  Influence of dianhydride regiochemistry on thermomechanical and rheological properties of 3,3′- and 4,4′-polyetherimides.  Polymer2021 212.

Chatham, C.A.; Das, A.; Long, T.E.; Bortner, M.J.; Williams, C.B.  Ageing of PBF-Grade Poly(Phenylene Sulfide) Powder and its Effect on Critical Printability Properties.  Macromolecular Materials and Engineering2021 306, 3.

Zawaski, C.E.; Chatham, C.A.; Wilts, E.M.; Long, T.E.; Williams, C.B.  Using fillers to tune material properties of an ion-containing semi-crystalline poly(ethylene glycol) for fused filament fabrication additive manufacturing.  Additive Manufacturing2021 39, 101844.

Chatham, C.A.; Bortner, M.J.; Johnson, B.N.; Long, T.E.; Williams, C.B.  Predicting mechanical property plateau in laser polymer powder bed fusion additive manufacturing via the critical coalescence ratio.  Materials & Design.  2021 201, 109474.

White, B.T.; Meenakshisundaram, V.; Feller, K.D.; Williams, C.B.; Long, T.E.  Vat photopolymerization of unsaturated polyesters utilizing a polymerizable ionic liquid as a non-volatile reactive diluent.  Polymer2021, 22.

Long, T.  Respecting differences.  Polymer International.  2020.

Dennis, J. M.; Mondschein, R. J.; Wolfgang, J. D.; Hegde, M.; Odle, R.; Long, T. E.  Synthesis and Characterization of Long-Chain Branched Poly(ether imide)s with A(3) Comonomers.  ACS Applied Polymer Materials.  2020, 2 (2), 958-965.

Cao, K.; Stovall, B. J.; Arrington, C. B.; Xu, Z.; Long, T. E.; Odle, R. R.; Liu, G. L.  Facile Preparation of Halogen-Free Poly(ether imide) Containing Phosphonium and Sulfonate Groups.  ACS Applied Polymer Materials.  2020, 2 (1), 66-73.

Cao, K.; Serrano, J. M.; Liu, T. Y.; Stovall, B. J.; Xu, Z.; Arrington, C. B.; Long, T. E.; Odle, R. R.; Liu, G. L.  Impact of metal cations on the thermal, mechanical, and rheological properties of telechelic sulfonated polyetherimides.  Polymer Chemistry.  2020, 11 (2), 393-400.

Mondschein, R. J.; Dennis, J. M.; Liu, H.; Ramakrishnan, R. K.; Sirrine, J. M.; Weiseman, T.; Colby, R. H.; Nazarenko, S.; Turner, S. R.; Long, T. E.  Influence of Bibenzoate Reqioisomers on Cyclohexanedimethanol-Based (Co)polyester Structure-Property Relationships.  Macromolecules.  2019.  Ahead of print.

Aduba, D. C.; Margaretta, E. D.; Marnot, A. E. C.; Heifferon, K.V.; Surbey, W. R.; Chartrain, N. A.; Whittington, A. R.; Long, T. E.; Williams, C. B.  Vat photopolymerization 3D printing of acid-cleavable PEG-methacrylate networks for biomaterial applications.  Materials Today Communication.  2019, in press.

Heifferon, K. V.; Mondschein, R. J.; Talley, S. J.; Moore, R. B.; Turner, S. R.; Long, T. E.  Tailoring the glassy mesophase range of thermotropic polyesters through copolymerization of 4,4′-bibenzoate and kinked isomer.  Polymer2019, 163, 125-133.

Sirrine, J. M.; Zlatanic, A.; Meenakshisundaram, V.; Messman, J. M.; Williams, C. B.; Dvornic, P. R.; Long, T. E.  3D Printing Amorphous Polysiloxane Terpolymers via Vat Photopolymerization. Macromolecular Chemistry and Physics.  2019.  Ahead of print.

Chen, X.; Zhang, K.; Talley, S. J.; Orsino, C. M.; Moore, R. B.; Long, T. E.  Quadruple hydrogen bonding containing supramolecular thermoplastic elastomers: Mechanical and morphological correlations.  J. Polym. Sci., Part A: Polym. Chem.  201957, 13-23.

Mapesa, E. U.; Chen, M.; Heres, M. F.; Harris, M. A.; Kinsey, T.; Wang, Y.; Long, T. E.; Lokitz, B. S.; Sangoro, J. R.  Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s.  Macromolecules2019.  Ahead of print.

Long, T. E.; Williams, C. B.  Printing nanomaterials in shrinking gels.  Science2018362, 1244-1245.

White, B.T.; Long, T. E.  Advances in Polymeric Materials for Electromechanical Devices.  Macromol, Rapid. Commun.  2018, 1800521.

Bossion, A.; Heifferon, K. V.; Zivic, N.; Long, T. E.; Sardon, H.  Organocatalyzed Step-Growth Polymerization. In Organic Catalysis for Polymerization.  Royal Society of Chemistry.  2018.

Heifferon, K.V.; Long, T.E.  Segmented Liquid Crystalline Copolyesters. In Liquid Crystalline Polymers.  Central West Publishing: Australia.  2018.

Bossion, A.; Heifferon, K. V.; Meabe, L.; Zivic, N.; Taton, D.; Hedrick, J. L.; Long, T. E.; Sardon, H.  Opportunities for organocatalysis in polymer synthesis via step-growth methods.  Prog. Poly. Sci.  2018in press.

Heifferon, K.V.; Long, T. E.  Advanced Polymers for Reduced Energy Consumption in Architecture.  Macromol. Rap. Comm.  2018, 1800597.

Sun, H.; Heifferon, K. V.; Ghassemi, H.; Long, T. E.; Schiraldi, D. A.  Unfrustration of a frustrated liquid crystalline polymer.  Polymer2018158, 59-64.

Rau, D. A.; Herzberger, J.; Long, T. E.; Williams, C. B.  Ultraviolet-Assisted Direct Ink Write to Additively Manufacture All-Aromatic Polyimides.  ACS Appl Mater Interfaces2018, 10 (41), 34828-34833.

Sirrine, J. M.; Schexnayder, S. A.; Dennis, J. M.; Long, T. E.  Urea as a monomer for isocyanate-free synthesis of segmented poly (dimethylsiloxane) polyureas.  Polymer.  2018, 154, 225-232.

Chen, M.; Inglefield, D. L.; Zhang, K.; Hudson, A. G.; Talley, S. J.; Moore, R. B.; Long, T. E.  Synthesis of urea-containing ABA triblock copolymers; Influence of pendant hydrogen bonding on morphology and thermomechanical properties.  J. Polym. Sci., Part A: Polym. Chem201856, 1844-1852.

Arrington, K. J.; Radzinski, S. C.; Drummey, K. J.; Long, T. E.; Matson, J. B.  Reversibly Cross-linkable Bottlebrush Polymers as Pressure-Sensitive Adhesives.  ACS Appl Mater.  2018, 10 (31), 26662-26668.

Chen, M.; White, B. T.; Kasprzak, C. R.; Long, T. E.  Advances in Phosphonium-based Ionic Liquids and Poly(Ionic Liquid)s as Conductive Materials.  Eur Polym J2018, 108, 28-37.

Moon, N. G.; Mazzini, F.; Pekkanen, A. M.; Wilts, E. M.; Long, T. E.  Sugar-Derived Poly(β-thioester)s as a Biomedical Scaffold.  Macromol. Chem. Phys.  2018, 219, 1800177.

Ju, L.; Pretelt, J.; Chen, T.; Dennis, J. M.; Heifferon, K. V.; Baird, D. G.; Long, T. E.; Moore, R. B.  Synthesis and characterization of phosphonated Poly(ethylene terephthalate) ionomers.  Polymer.  2018, 151, 154-163.

Isaac, K.M., Sabaraya, I.V., Ghousifam, N., Das, D., Pekkanen, A.M., Romanovicz, D.K., Long, T.E., Saleh, N.B., Rylander, M.N.  Functionalization of single-walled caron nanohorns for simultaneous fluorescence imaging and cisplatin deliver in vitro.  Carbon.  2018, 138, 309-318.

Chen, M., Dugger, J.W., Li, X., Wang, Y., Kumar, R., Meek, K.M., Uhrig, D.W., Browning, J.F., Madsen, L.A., Long, T.E., Lokitz, B.S.  Polymerized ionic liquids: Effects of counter-anions on ion conduction and polymerization kinetics.  Journal of Polymer Science, Part A: Polymer Chemistry.  2018, 56, 1346-1357.

Herzberger, J., Meenakshisundaram, V., Williams, C.B., Long, T.E.  3D printing all-aromatic polyimides using stereolithographic 3D printing of polyamic acid salts.  ACS Macro Letters.  2018, 7, 493-497.

Aduba, D.C., Zhang, K., Kanitkar, A., Sirrine, J.M., Verbridge, S.S., and Long, T.E.  Electrospinning of plant oil-based, non-isocyanate polyurethanes for biomedical applications.  Journal of Applied Polymer Science.  2018, 135, 46464.

Showalter, T., Peach, S., Giles, W., Trainor, J., Long, T., Moon, N., Hylton, J., Moore, J.  Development and preclinical testing of a novel biodegradable hydrogel vaginal packing technology for gynecologic HDR brachytherapy.  Brachytherapy.  2018, 10, 306-314.

Sirrine, J., Meenakshisundaram, V., Moon, N.G., Scott, P.J., Mondschein, R.J., Weiseman, T.F., Williams, C.B., Long, T.E.  Functional siloxanes with photo-activated, simultaneous chain extension and crosslinking for lithography-based 3D printing.  Polymer.  2018, 152, 25-34.

Wilts, E.; Herzberger, J.; Long, T.E.  Addressing Water Scarcity:  Cationic Polyelectrolytes in Water Treatment and Purification.  Polymer International.  2018, 67 (7), 799-814.

Long, T.E.  Speaking Different Languages: From Molecules to Manufacturing.  Polymer International.  2018, 67, 5-6.

Dennis, J.M.; Steinberg, L.I.; Pekkanen, A.; Maiz, J.; Hegde, M.; Muller, A.; Long, T.E.  Synthesis and Characterization of Isocyanate-free Polyureas.  Green Chemistry.  2018, 20, 243-249.

Zhang, K.; Fahs, G.; Margaretta, E.; Hudson, A.; Moore, R.; Long, T.E.  Acetyl-Protected Cytosine and Guanine Containing Acrylics as Supramolecular Adhesives.  The Journal of Adhesion.  2018.

He, Z.; Yang, Y.; Chen, M.; Zou, S.; Long, T.E.; Yang, X-L.  Efficient Recovery of Polyelectrolyte Draw Solutes in Forward Osmosis towards Sustainable Water Treatment.  Desalination.  2017, 422, 134-141.

Schultz, A.R.; Bobade, S.; Scott, P.J.; Long, T.E.  Hydrocargon-soluble Piperazine-containing Dilithium Anionic Initiator for High Cis-1,4 Isoprene Polymerization.  Macromolecular Chemistry and Physics.  2017, 219, 1700201-1700206.

Zawaski, C.; Margaretta, E.; Stevenson, A.; Pekkanen, A.; Long, T.E.; Whittington, A.; Williams, C.B.  Embedding of liquids into water soluble materials via additive manufacturing for timed release.  2017 Solid Freeform Fabrication Symposium Proceedings (SFF Symp 2017).  2017in press.

Meenakshisundaram, V.; Chartrain, N.; Hegde, M.; Sekhar, S.; Williams, C.; Long, T.; Tafti, D.  Additive Manufacturing Of High-Performance All-Aromatic Polyimides Using Vat-Photopolymerization.  2017 Annual International Solid Freeform Fabrication Symposium (SFF Symp 20172017.

Meenakshisundaram, V.; Scott, P.; Sirrine, J.; Williams, C.; Long, T.  Large-Area, High-Resolution Additive Manufacturing of Elastomers With Scanning-Mask Projection Vat-Photopolymerization.  2017 Annual International Solid Freeform Fabrication Symposium (SFF Symp 20172017.

Chartrain, N.; Aduba, D.; Meenakshisundaram, V.; Moon, N.; Heflin, R.; Long, T.E.; Williams, C.  Stereolithographic Fabrication of Ionic Polymer-Metal Composite (IPMC) Actuators using a Photocurable Ionic Liquid.  2017 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2017)2017.

Zawaski, C.; Stevenson, A.; Pekkanen, A.; Whittington, A.; Long, T.E.; Williams, C.B  Tailoring geometry to control dissolution of water soluble materials via additive manufacturing.  2017 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2017.   2017.

Pekkanen, A.M.; Mondschein, R.J.; Williams, C.B.; Long, T.E.  3D Printing Polymers with Supramolecular Functionality for Biological Applications.  Biomacromolecules.  2017, 18 (9), 2669–2687. 

Tang, X.; Ripepi, N.; Valentine, K.A.; Keles, C.; Long, T.E.; Gonciaruk, A.  Water vapor sorption on Marcellus shale: measurement, modelling and thermodynamic analysis.  Fuel.  2017.

Moon, N.G.; Pekkanen, A.M.; Long, T.E.; Showalter, T.N.  Thiol-Michael ‘click’ hydrogels as an imageable packing material for cancer therapy.  Polymer.  2017, 125, 66–75.

Grissom, T.G.; Sirrine, J.M.; Long, T.E.; Esker, A.R.; Morris, J.R.  Interaction parameters for the uptake of sulfur mustard mimics into polyurethane films.  Progress in Organic Coatings.  2017, 107, 14-17.

Aduba, D.C. Jr.; Margaretta, E.; Marnot, A.E.C.; Chartrain, N.A.; Valentine, K.; Surbey, W.R.; Feller, K.D.; Whittington, A.R.; Long, T.E.; Williams, C.B.  3D printed acid-cleavable hydrogels using vat photopolymerization.  Applied Physics Reviews – 3D Bioprinting: Physical and Chemical Processes.  2017.

Pekkanen, A.M.; Mondschein, R.J.; Guenette, D.; Mohaptra, N.; Long, T.E.  Characterization of peptide coatings adhered to synthetic fibers:  A versatile model for peptide nucleic acids.  International Journal of Adhesion and Adhesives.  2017, 75, 17-22.

Dennis, J.M.; Fahs, G.B.; Moon, N.G.; Mondschein, R.J.; Moore, R.B.; Wilkes, G.L.; Long, T.E.  Synthesis of Polysulfone-Containing Poly (butylene terephthalate) Segmented Block Copolymers:  Influence of Segment Length on Thermomechanical Performance.  Macromolecules.  201750 (13), 5107–5113.

Hegde, M.; Meenakshisundaram, V.; Chartrain, N.; Sekhar, S.; Tafti, D.; Williams, C.B.; Long, T.E.  3D Printing All-Aromatic Polyimides using Mask-Projection Stereolithography:  Processing the Nonprocessable.  Advanced Materials.  2017.

Hedge, M.; Pekkanen, A.M.; Long, T.E.; Baker, A.  Profiling Extractables from 3D Printed Structures Prepared Using Additive Manufacturing Techniques.  Poster Presentation, 65th ASMS Conference2017.

Mondschein, R.J.; Kanitkar, A.; Williams, C.B.; Verbridge, S.S.; Long, T.E.  Polymer structure-property requirements for stereolithographic 3D printing of soft tissue engineering scaffolds.  Biomaterials.  2017, 140, 170-188.

Dennis, J.M.; Fazekas, N.A.; Mondschein, R.J.; Ramakrishnan, R.; Nazarenko, S.; Long, T.E.  Influence of cyclobutene segments in cycloaliphatic decahydronaphthalene-containing copolyesters.  High Performance Polymers.  2017, 29 (6), 750-756.

McDaniel, D.K.; Jo, A.; Ringel-Scaia, V.M.; Coutermarsh-Ott, S.; Rothschild, D.E.; Powell, M.D.; Zhang, R.; Long, T.E.; Oestreich, K.J.; Riffle, J.S.; Davis, R.M.; Allen, I.C.  TIPS pentacene loaded PEO-PDLLA core-shell nanoparticles have similar cellular uptake dynamics in M1 and M2 macrophages and in corresponding in vivo microenvironments.  Nanomedicine: Nanotechnology, Biology and Medicine.  2017, 13 (3), 1255-1266.

Schreiner, C.; Bridge, A.T.; Hunley, M.T.; Long, T.E.; Green, M.D.  Segmented imidazolium ionenes:  Solution rheology, thermomechanical properties, and electrospinning.  Polymer.  2017, 114, 257-265.

Pekkanen, A. M.; Zawaski, C.; Stevenson Jr., A. T.; Dickerman, R.; Whittington, A. R.; Williams, C. B.; Long, T. E.  Poly(ether ester) Ionomers as Water-Soluble Polymers for Material Extrusion Additive Manufacturing Processes.  ACS Applied Materials and Interfaces.  2017, 9 (14), 12324-12331.

Dugger, J.; Chen, M.; Long, T.; Fu, Y.; Kumar, R.; Lokitz, B.; Browning, J.  Probing the Electromechanical Response Mechanism of Ionic Bock Copolymers.  Bulletin of the America Physical Society.  201762 (4).

Long, T.E.  Reaction:  Benign by Design Demands Innovation.  Chem.  2017, 2 (1), 7-8.

Moon, N.G.; Mondschein, R.; Long, T.E. Poly (β-thioester) Containing Monodisperse Oxamide Hard Segments Using a Chemoselective Thiol-Michael Addition Reaction.  Polymer Chemistry.  2017, 8, 2598-2608.

Schultz, A.R.; Chen, M.; Fahs, G.B.; Moore, R.B.; Long, T.E.  Living anionic polymerization of 4-diphenylphosphino styrene for ABC triblock copolymers.  Polymer International.  2017, 66 (1), 52-58.


Summer 2022
Course NumberCourse Title
MSE 792Research
Spring 2022
Course NumberCourse Title
CHE 494Special Topics
CHM 494Special Topics
CHE 598Special Topics
CHM 598Special Topics
MSE 792Research
Fall 2021
Course NumberCourse Title
MSE 792Research
Spring 2021
Course NumberCourse Title
CHM 494Special Topics
CHM 598Special Topics