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Displaying 226 - 250 of 1923

The Impact and Fate of Graphene Oxide in Graphene Oxide/Polymer Nanocomposites Exposed to Ultraviolet Irradiation

August 11, 2020
Author(s)
David G. Goodwin, Trinny Lai, Yadong Lyu, Chen Yuan Lu, Alejandro Campos, Vytautas Reipa, Tinh Nguyen, Li Piin Sung
Ultraviolet (UV) radiation, heat and moisture can lead to polymer degradation outdoors but the effect of graphene oxide (GO) nanofiller incorporation on this process is unknown. Since GO can improve the mechanical, barrier, and thermal properties of a

The Concentration Dependence of the Size and Symmetry of a Bottlebrush Polymer in a Good Solvent

August 7, 2020
Author(s)
Daniel F. Sunday, Alexandros Chremos, Tyler B. Martin, Alice B. Chang, Adam B. Burns, Robert H. Grubbs
Bottlebrush polymers consist of a linear backbone with densely grafted sidechains which impact the rigidity of the molecule. The persistence length of the bottlebrush backbone in solution is influenced by both the intrinsic structure of the polymer and by

Bayesian Hierarchical Models for Service Life Prediction of Polymers

August 5, 2020
Author(s)
Adam L. Pintar, Christopher C. White, Li Piin Sung
Service life prediction for polymers remains an elusive goal. In this chapter, a general methodology first described in a previous study \cite{pintar2018predicting} is recapitulated and extended. A central component of the methodology is a Bayesian

Towards fast screening of organic solar cell blends

August 5, 2020
Author(s)
Lee Richter, Artem Levistsky, Giovanni M. Matrone, Aditi Khirbat, Ilaria Bargigia, Xiaolei Chu, Oded Nahor, Tamar Segal-Perez, Adam Moule, Carlos Silva, Natalie Stingelin, Gitti L. Frey
The ever increasing library of materials systems developed for organic solar-cells, including highly promising non-fullerene acceptors and new, high-efficiency donor polymers, demands the development of methodologies that (i) allow fast screening of a

Polymer Surface/Interface Consortium 2018 Workshop Report

July 29, 2020
Author(s)
Ronald S. Lankone, Li Piin Sung, David G. Goodwin, Andrew Fairbrother
The Polymer Surface/Interface (PSI) consortium held a two-day workshop at the National Institute of Standards and Technology (NIST) in Gaithersburg, MD on October 17th & 18th, 2018 titled, “The development of characterization tools, test methods, modeling

Importance of Sub-Nanosecond Fluctuations on the Toughness of Polycarbonate Glasses

July 23, 2020
Author(s)
Christopher L. Soles, Kanae N. Ito, Adam B. Burns, Edwin P. Chan, Robert M. Dimeo, Madhu Sudan Tyagi, Albert F. Yee, Jianwei Liu
This article explores the relationship between the nano- to picosecond dynamics, as quantified by elastic incoherent neutron scattering, in polycarbonate (PC) glasses with their mechanical toughness. We establish a robust correlation between mechanical

Water-Polyamide Chemical Interplay in Desalination Membranes explored by Ambient Pressure X-ray Photoelectron Spectroscopy

June 24, 2020
Author(s)
Sabrina Gericke, William D. Mulhearn, Dana E. Goodacre, Joseph Raso, Daniel J. Miller, Lauryn Carver, Slavomir Nemsak, Osman Karslioglu, Lena Trotochaud, Hendrik Bluhm, Christopher Stafford, Christin Buechner
Reverse osmosis using aromatic polyamide membranes is currently the most important technology for seawater desalination. The performance of reverse osmosis membranes is highly dependent on the interplay of their surface chemical groups with water and water

Quantifying Strain via Buckling Instabilities in Surface Modified Polymer Brushes

May 21, 2020
Author(s)
Cassandra M. Reese, Wei Guo, Brittany J. Thompson, Phillip K. Logan, Christopher Stafford, Derek L. Patton
We present a quantitative method of measuring the compressive strain of wrinkled polymer films and coatings with knowledge of the "skin" thickness, wrinkle wavelength, and wrinkle amplitude. The derived analytical expression is validated with a well

Effects of temperature and humidity on high-strength p-aramid fibers used in body armor

April 14, 2020
Author(s)
Amy E. Engelbrecht-Wiggans, Faraz A. Burni, Emilien Guigues, Shefei Jiang, Vivian Yu, Thang Huynh, Zois Tsinas, Deborah Jacobs, Amanda Forster
To improve the reliability and design of body armor, it is imperative to understand the failure modes and the degradation rates of the materials used in armor. Despite the best efforts of manufacturers, some vulnerability of armor materials to aging due to

On the Nature of Macroradicals Formed upon Radiolysis of Aqueous Poly(N--?vinylpyrrolidone)Solutions

April 2, 2020
Author(s)
Richard D. Holbrook, Clelia Dispenza, Maria Antonietta Sabatino, Natascia Grimaldi, Bjorn Dahlgren, Mohamad Al-Sheikhly, James F. Wishart, Zois Tsinas, Mats Jonsson
In this work we have explored the nature of macroradicals formed upon radiolysis of aqueous poly(N-­‐vinylpyrrolidone) (PVP) solutions using pulse radiolysis, density functional theory (DFT) and literature data. On the basis of literature data on site-­
Displaying 226 - 250 of 1923
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