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Displaying 1 - 25 of 1468

Oxidation Reactions in Kink Bands Regions of UHMMPE Fiber-Based Laminates Used in Body Armor: A Mechanistic Study

May 29, 2018

Author(s):

Zois Tsinas, Amanda L. Forster, Mohamad I. Al-Sheikhly

This work demonstrates the synergy between the thermo-mechanical induced degradation and the oxidation reactions in the kink-banded areas of ultra-high molar...

Equilibrium Free Energies from Non-Equilibrium Trajectories with Relaxation Fluctuation Spectroscopy

May 28, 2018

Author(s):

David J. Ross, Elizabeth A. Strychalski, Christopher Jarzynski, Samuel M. Stavis

Recent advances in non-equilibrium statistical mechanics and single-molecule measurements have enabled the determination of equilibrium free energies from non-...

Functional Group Quantification of Polymer Nanomembranes with Soft X-rays

March 15, 2018

Author(s):

Daniel F. Sunday, Edwin P. Chan, Sara V. Orski, Ryan C. Nieuwendaal, Christopher M. Stafford

Paper in electronic and optoelectronic devices

March 06, 2018

Author(s):

Dongheon Ha, Zhiqiang Fang, Nikolai B. Zhitenev

The demand for lightweight, cost-effective, and/or flexible electronic and optoelectronic devices drives research toward new materials advancing the desired...

Influence of Polymer and Ion Solvation on Conformational Properties of Flexible Polyelectrolytes

March 02, 2018

Author(s):

Alexandros Chremos, Jack F. Douglas

The study of the coupling between the conformational properties of a polyelectrolyte chain and the distribution of counter-ions surrounding the chain is...

“Unexpected” frequency behavior in QCM-D: When can frequency increase with increased adhered mass?

February 23, 2018

Author(s):

Christopher C. White, Wiener Clinton, Robert A. Weiss, Vogt D. Bryan

For the qualitative interpretation of quartz crystal microbalance (QCM) data, a decrease in frequency is generally indicative of increased coupled mass to the...

A Kinetics Based Models for Environmentally Induced Sealant Degradation

February 13, 2018

Author(s):

Donald L. Hunston, Christopher C. White

Caulks and sealants are a critical part of any structure that is exposed to the environment. Although they are good materials, they eventually fail, and the...

Optimizing Self-Consistent Field Theory Block Copolymer Models with X-Ray Metrology

February 12, 2018

Author(s):

Adam F. Hannon, Daniel F. Sunday, Alec Bowen, Gurdaman Khaira, Jiaxing Ren, Paul Nealey, Juan de Pablo, Regis J. Kline

A block copolymer self-consistent field theory (SCFT) model is used for direct analysis of experimental X-ray scattering data obtained from thin films of...

Inverse Transformation: Unleashing Heterogeneous Dynamics with an Alternative Approach to XPCS Data Analysis

January 31, 2018

Author(s):

Ross N. Andrews, Suresh Narayanan, Fan Zhang, Ivan Kuzmenko, Jan Ilavsky

X-ray photon correlation spectroscopy (XPCS), as an extension of dynamic light scattering (DLS) in the X-ray regime, detects temporal intensity fluctuations of...

Ferroelectricity in Polar Polymer-based FETs: A Hysteresis Analysis

January 15, 2018

Author(s):

Vasileia Georgiou, Dmitry Veksler, Jason P. Campbell, Jason T. Ryan, Pragya R. Shrestha, D. E. Ioannou, Kin P. Cheung

There is an increasing number of reports on polar polymer-based Ferroelectric Field Effect Transistors (FeFETs), where the hysteresis of the drain current...

Nanostructured lipid-based films for substrate-mediated applications in biotechnology

January 10, 2018

Author(s):

Minjee Kang, Mohit Tuteja, Andrea Centrone, Daniel Topgaard, Cecilia Leal

Amphiphilic in nature, lipids spontaneously self-assemble into a range of nanostructures in the presence of water. Among lipid self-assembled structures,...

Characterizing the Interface Scaling of High Chi Block Copolymers near the Order-Disorder Transition

January 09, 2018

Author(s):

Daniel F. Sunday, Michael Maher, Adam F. Hannon, Christopher D. Liman, Summer Tein, Gregory Blachut, Yusuke Asano, Christopher Ellison, C. Grant Willson, Regis J. Kline

Quantitative Comparison of Atomistic Simulations with Experiment for a Cross-Linked Epoxy: A Specific Volume – Cooling-Rate Analysis Epoxy

January 08, 2018

Author(s):

Ketan S. Khare, Frederick R. Phelan Jr.

Cross-linked epoxy thermosets, like all glass-forming viscoelastic materials, show both a temperature and rate dependence in their thermo-mechanical properties...

Validation of ATR FT-IR to identify polymers of plastic marine debris, including those ingested by marine organisms

January 03, 2018

Author(s):

Melissa R. Jung, F. D. Horgen, Sara V. Orski, Viviana Rodriguez Cardenas, Kathryn L. Beers, George H. Balazs, T. T. Jones, Thierry M. Work, Kayla C. Brignac, Sarah-Jeanne Royer, K. D. Hyrenbach, Brenda A. Jensen, Jennifer M. Lynch

Polymer identification of plastic marine debris can help identify its sources, degradation, and fate. We optimized and validated a fast, simple, and accessible...

Communication: Counter-ion solvation and anomalous low-angle scattering in salt-free polyelectrolyte solutions

December 29, 2017

Author(s):

Alexandros Chremos, Jack F. Douglas

We investigate the influence of counter-ion solvation on the homogeneity of salt-free polyelectrolyte solutions based on coarse-grained model that includes an...

Evaluating models for polycaprolactone crystallization via simultaneous rheology and Raman spectroscopy

December 27, 2017

Author(s):

Anthony P. Kotula, Kalman D. Migler

The crystallization of a polymer melt is characterized by dramatic structural and mechanical changes that have a significant impact on the processing...

Highly Efficient Rapid Annealing of Thin Polar Polymer Film Ferroelectric Devices at Sub-Glass Transition Temperature

December 18, 2017

Author(s):

Vasileia Georgiou, Dmitry Veksler, Jason T. Ryan, Jason P. Campbell, Pragya R. Shrestha, D. E. Ioannou, Kin P. Cheung

An unexpected rapid anneal of electrically active defects in an ultra-thin (15.5 nm) polar polyimide film at and below glass transition temperature (Tg) is...

Free Surface Relaxations of Star-Shaped Polymer Films

November 28, 2017

Author(s):

Alexandros Chremos, Bradley R. Frieberg, Emmanouil Glynos, Kyle Johnson, Hengxi Yang, Suresh Narayanan, Peter F. Green, Georgios Sakellariou

X-ray photon correlation spectroscopy (XPCS) studies show that the viscosities of thin film linear chain polymers at temperatures sufficiently high above the...

Towards a Hybrid Human-Computer Scientific Information Extraction Pipeline

November 27, 2017

Author(s):

Roselyne B. Tchoua, Kyle Chard, Debra J. Audus, Logan T. Ward, Lequieu Joshua, Juan J. de Pablo, Ian Foster

The emerging field of materials informatics has the potential to greatly reduce time-to-market and development costs for new materials. The success of such...

Summary of the Discussions Following each Session of the 6th Service Life Prediction of Polymer Materials: Over the Horizon meeting held in Santa Fe, NM, March 2-24-2016.

November 08, 2017

Author(s):

Christopher C. White

During March 20th to 24th, 2016, over 50 engineers and scientists from across the globe attended the sixth annual Service Life Prediction of Polymer Materials...

Service Life Prediction -Why is this so hard?

November 08, 2017

Author(s):

Christopher C. White, Kenneth M. White, James Pickett

Service life prediction in general and weathering lifetime in particular have been persistent problems despite nearly a century of work. Part of the problem...

Buckling Instabilities in Polymer Brush Surfaces via Postpolymerization Modification

October 30, 2017

Author(s):

Wei Guo, Cassandra M. Reese, Li Xiong, Phillip K. Logan, Brittany J. Thompson, Christopher M. Stafford, Anton Ievlev, Bradley S. Lokitz, Olga S. Ovchinnikova, Derek L. Patton

We report a simple route to engineer ultrathin polymer brush surfaces with wrinkled and creased morphologies using postpolymerization modification (PPM), where...

Thickness-dependent structural relaxation in ultrathin glassy polymer films probed by wrinkling dynamics

October 16, 2017

Author(s):

Jun Y. Chung, Jack F. Douglas, Doyoung Moon, Christopher M. Stafford

The measurement of the Youngs modulus and stress relaxation in ultrathin films is a notoriously difficult problem. Recent work has shown that the high...

Measuring UV Curing Parameters of Commercial Photopolymers used in Additive Manufacturing

October 09, 2017

Author(s):

Joseph A. Bennett

A testing methodology was developed to expose photopolymer resins and measure the cured material to determine two key parameters related to the...

Wrinkling-to-delamination transition in thin polymer films on compliant substrates

October 09, 2017

Author(s):

Adam J. Nolte, Jun Y. Chung, Chelsea S. Davis, Christopher M. Stafford

Compressing a thin, stiff film attached to a thick, compliant substrate can lead to a number of different modes of mechanical deformation depending upon the...

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