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Displaying 26 - 50 of 1909

Correlation of Structure and Morphology in an Ethylene-glycol Side-chain Modified Polythiophene via Combined X-ray Scattering and Four-dimensional Scanning Transmission Electron Microscopy

October 10, 2024
Author(s)
Andrew Herzing, Lucas Flagg, Chad R. Snyder, Lee Richter, Jonathan Onorato, Christine Luscombe, Ruipeng Li
We report the results of a combined grazing incidence wide-angle X-ray scattering (GIWAXS) and four-dimensional scanning transmission microscopy (4D-STEM) analysis of the effects of thermal processing on poly(3[2-(2-methoxyethoxy)ethoxy]-methylthiophene- 2

Visualizing Shockwave Interactions and Sub-Catastrophic Damage in Materials via Mechanophores

October 7, 2024
Author(s)
Polette Centellas, Kyle Mehringer, Andrew Bowman, Katherine Evans, Parth Vagholkar, Travis Thornell, Liping Huang, Sarah Morgan, Christopher Soles, Yoan Simon, Edwin Chan
Understanding the physical and chemical response of materials to impulsive deformation is crucial for applications ranging from soft robotic locomotion to space exploration to seismology. However, investigating material properties at extreme strain rates

Effects of Weathering and Formulation on the Properties of Vinyl Siding

September 23, 2024
Author(s)
Ronald Lankone, Mauro Zammarano, Song Jhang, Ickchan Kim, David Goodwin, Gianluca Sarti, Stefano Gardi, Camillo Cardelli, Lipiin Sung
Vinyl siding has become a popular choice for residential exteriors across the United States. In its insulated form, this siding includes a shell, capstock, and substrate, that encase a foamed material, serving as an efficient insulating material. While it

Structure Development in Cross-Linked, Soybean Oil-based Waterborne Polyurethanes

August 16, 2024
Author(s)
Zoran S Petrovic, Jasna Djonlagic, Jian Hong, Milica Vukovic, Jan Ilavsky, Brian Bush, Fan Zhang
Development of waterborne polyurethanes (WPU) using bio-based sources represents a step towards sustainable materials science and industry. We synthesized bio-based cationic water-dispersed crosslinked polyurethanes from high oleic soybean oil (HOSO)

The Block Copolymer Phase Behavior Database

August 10, 2024
Author(s)
Nathan Rebello, Akash Arora, Hidenobu Mochigase, Tzyy-Shyang Lin, Debra Audus, Bradley Olsen
The Block Copolymer Database (BCDB) is a platform that allows users to search, submit, visualize, benchmark, and download experimental phase measurements and their associated characterization information for di- and multiblock copolymers. To the best of

Additive Manufacturing of Highly Entangled Polymer Networks

August 1, 2024
Author(s)
Abhishek Dhand, Matthew Davidson, Hannah Zlotnick, Thomas Kolibaba, Jason Killgore, Jason Burdick
Incorporation of polymer chain entanglements within a single network can synergistically improve stiffness and toughness, yet attaining such dense entanglements through vat photopolymerization additive manufacturing (e.g., digital light processing, DLP)

Entanglement kinetics in polymer melts are chemically specific

July 3, 2024
Author(s)
Benjamin Dolata
We investigate the universality of entanglement kinetics in polymer melts. We compare predictions of a recently developed constitutive equation for disentanglement to molecular dynamics simulations of both united-atom polyethylene and Kremer-Grest models

Predicting the toughness of compatibilized polymer blends

June 19, 2024
Author(s)
Robert Ivancic, Debra Audus
Polymer blends can yield superior materials by merging the unique properties of their components. However, these mixtures often phase separate, leading to brittleness. While compatibilizers can toughen these blends, their vast design space makes

Viscoelastic Assessment Method of Polymeric Foams under Cyclic Fatigue

June 14, 2024
Author(s)
Moira M Foster, Daniel C Morrison, Alexander Landauer, Mark Herynk, Leslie Lamberson
Many energy absorption applications utilize flexible polymeric foams for their viscoelastic properties. It is desired that the material will perform consistently across repeated compression cycles. This study examines the effect of fatigue at low strain

An autonomous design algorithm to experimentally realize three-dimensionally isotropic auxetic network structures without compromising density

May 29, 2024
Author(s)
Meng Shen, Marcos Reyes-Martinez, Ami Ahure Powell, Mark Iadicola, Abhishek Sharma, Fabian Bylehn, Nidhi Pashine, Edwin P. Chan, Christopher Soles, Heinrich Jaeger, Juan de Pablo
Auxetic materials have a negative Poisson's ratio and are of significant interest in applications that include impact mitigation, membrane separations and biomedical engineering. While there are numerous examples of structured materials that exhibit

Simulating drifting fish aggregating device trajectories to identify potential interactions with endangered sea turtles

May 20, 2024
Author(s)
Lauriane Escalle, Joe Scutt Phillips, Jon Lopez, Jennifer Lynch, Hilario Murua, Sarah-Jeanne Royer, Yonat Swimmer, J Murua, Alex Sen Gupta, Victor Restrepo, Gala Moreno
Purse-seine fishers using drifting fish aggregating devices (dFADs), mainly built with bamboo, plastic buoys, and plastic netting, to aggregate and catch tropical tuna, deploy 46,000–65,000 dFADs per year in the Pacific Ocean. Some of the major concerns

Influence of Spectral Bandwidth on the Working Curve in Vat Photopolymerization

April 29, 2024
Author(s)
Benjamin Caplins, Thomas Kolibaba, Uwe Arp, C Cameron Miller, Yuqin Zong, Dianne L. Poster, Callie Higgins, Jason Killgore
In vat photopolymerization, 3-dimensional parts are fabricated by using patterned light to spatially cure a liquid resin. One of the foundational measurements for vat photopolymerization is known as the working curve whereby the depth (i.e. thickness) of

Self-Assembly of Hierarchical High-h Fluorinated Block Copolymers with an Orthogonal Smectic-within-Lamellae 3 nm Sub-Lattice and Vertical Surface Orientation

April 16, 2024
Author(s)
Bijal Patel, Hongbo Feng, Whitney Loo, Chad R. Snyder, Christopher Eom, Julia Murphy, Daniel Sunday, Paul Nealey, Dean DeLongchamp
Hierarchical structure-within-structure assemblies offer a route toward increasingly complex and multifunctional materials while pushing the limits of block copolymer self-assembly. We present a detailed study of the self-assembly of a series of

Evaluating Models That Predict Epoxy Conversion Using Rheological Properties

April 15, 2024
Author(s)
Stian Romberg, Paul Roberts, Chad R. Snyder, Anthony Kotula
Simultaneous rheology and conversion measurements of neat and composite epoxy resins reveal that conventional models neither accurately nor fully describe the relationship between rheology and conversion. We find that models predicting thermoset conversion

Online Measurement for Parameter Discovery in Fused Filament Fabrication

April 3, 2024
Author(s)
Jake Read, Jonathan Seppala, Filippos Tourlomousis, James Warren, Nicole Bakker, Neil Gershenfeld
Abstract To describe a new method for the automatic generation of process parameters for fused filament fabrication (FFF) across varying machines and materials. We use an instrumented extruder to fit a function that maps nozzle pressures across varying

Results of an Interlaboratory Study on the Working Curve in Vat Photopolymerization

March 18, 2024
Author(s)
Thomas Kolibaba, Jason Killgore, Benjamin Caplins, Callie Higgins, Uwe Arp, C Cameron Miller, Yuqin Zong, Dianne L. Poster
The working curve informs resin properties and print parameters for stereolithography, digital light processing, and other photopolymer additive manufacturing (PAM) technologies. First demonstrated in 1992, the working curve measurement of cure depth vs
Displaying 26 - 50 of 1909
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