Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



TECH SPACE
Engineering on a blue streak
by Staff Writers
Newark DE (SPX) Jul 31, 2017


University of Delaware researchers made the University logo using their newly developed polymerization technique. Credit Abhishek Shete/ University of Delaware

A pair of engineers at the University of Delaware has developed a process to form interwoven polymer networks more easily, quickly and sustainably than traditional methods allow. Their secret ingredient? Blue light.

Abhishek Shete, graduate research assistant in materials science and engineering, and Christopher Kloxin, assistant professor in materials science and engineering and chemical and biomolecular engineering, describe their method in a paper featured on the cover of the 24th issue of Polymer Chemistry. The paper is titled "One-pot blue-light triggered tough interpenetrating polymeric network (IPN) using CuAAC and methacrylate reactions."

Polymers, which are materials made from chains of molecules, are found in everything from food to clothing to cars. Two or more types of polymer chains with different individual properties can also be linked together to form interpenetrating polymeric networks, materials that often combine favorable mechanical properties from each polymer such as high strength and toughness.

"These chemistries independently are used in a broad range of applications," from dental composites, automobile bumpers to drug delivery materials, Shete said.

However, the process of linking polymers is not simple. It requires two chemical reactions, which are typically initiated through either a lengthy two-step process or a one-step process induced at elevated temperatures and longer time spans.

The method Kloxin and Shete developed is one step and works rapidly at room temperature and ambient conditions.

They use 470-nanometer blue light, which is similar to blue LED light used to detect certain body fluids in crime scene investigations. This light triggers reactions with a photosensitizer called camphorquinone and an activator called amine. These materials are commonly utilized in polymeric dental composites for filling cavities.

The light irradiates the materials to photostimulate the two chemical reactions, but not simultaneously. First up is a reaction called the copper-catalyzed azide-alkyne cycloaddition (CuAAC) click polymerization. This reaction is facilitated by copper, and polymerization occurs in steps. Next is a reaction called the methacrylate polymerization, which forms a plastic-like material in a manner similar to adding links to a growing chain. "This is unique in the way the blue light induces sequential reactions," says Kloxin.

The end result is a material that Kloxin and Shete describe as a "glassy film," less brittle than pure methacrylate and stronger than pure CuAAC at higher temperature. The films made from this IPN material also exhibit shape memory - when deformed, it can be returned to its original size and shape with 15 minutes of heating at 80 degrees Celsius.

This blue-light approach to form interpenetrating polymer networks saves time and energy, but those are not its only advantages. For one, this approach allows Kloxin and Shete to control the pair of chemical reactions with increased precision, allowing them to fashion the polymer networks into complex shapes. This rapid method also keeps the ingredients from separating in a way that could otherwise interfere with the formation of an interpenetrating polymer network.

In addition, the new process requires none of the solvents or additives commonly used in plastics manufacturing, often added to prevent brittle fracture. The materials reported by Kloxin and Shete exhibit enhanced toughness that overcomes this brittleness without any solvents or additives, also making it a greener synthetic approach.

The team has filed a provisional patent for the method described in the new paper. "These chemistries could be attached to other molecules," Kloxin said, and the team will test their applications to form hydrogels, dental materials and other polymer networks.

TECH SPACE
Making polymer chemistry 'click'
Berkeley CA (SPX) Jul 27, 2017
A team of researchers has developed a faster and easier way to make sulfur-containing polymers that will lower the cost of large-scale production. The achievement, published in Nature Chemistry and Angewandte Chemie, opens the door to creating new products from this class of polymers while producing far less hazardous waste. The researchers' reaction technique, dubbed SuFEx for sulfur(VI) ... read more

Related Links
University of Delaware
Space Technology News - Applications and Research


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

TECH SPACE
ESA astronaut Paolo Nespoli starts third mission on Space Station

Voyager spacecraft still in communication 40 years out into the void

NextSTEP Partners Develop Ground Prototypes to Expand our Knowledge of Deep Space Habitats

Three-man crew reaches International Space Station

TECH SPACE
Iran in 'successful' test of satellite-launch rocket

ISRO Develops Ship-Based Antenna System to Track Satellite Launches

India looks to more launches with new facility from 2018

Sea Launch to be modernized for Russia's Soyuz-5 carrier rocket

TECH SPACE
Eclipse Balloons to Study Effect of Mars-Like Environment on Life

Portals to new worlds: Martian exploration near the North Pole

Opportunity enters Automode during solar conjunction pause

Five Years Ago and 154 Million Miles Away: Touchdown!

TECH SPACE
China develops sea launches to boost space commerce

Chinese satellite Zhongxing-9A enters preset orbit

Chinese Space Program: From Setback, to Manned Flights, to the Moon

Chinese Rocket Fizzles Out, Puts Other Launches on Hold

TECH SPACE
Iridium Announces Third Iridium NEXT Launch Date

Airbus DS to expand cooperation with Russia

UK space companies to develop international partnerships

ASTROSCALE Raises a Total of $25 Million in Series C Led by Private Companies

TECH SPACE
JV with Russia to build up to 50 satellite solid-state power amplifiers

NASA enhances online scientific tool used by hundreds Worldwide

ARCTEC receives contract for Air Force radar sites in Alaska

WSU physicists turn a crystal into an electrical circuit

TECH SPACE
Unexpected life found at bottom of High Arctic lakes

Researchers detect exoplanet with glowing water atmosphere

Hubble detects exoplanet with glowing water atmosphere

An Earth-like atmosphere may not survive Proxima b's orbit

TECH SPACE
New Horizons Video Soars over Pluto's Majestic Mountains and Icy Plains

Juno spots Jupiter's Great Red Spot

New evidence in support of the Planet Nine hypothesis

NASA's New Horizons Team Strikes Gold in Argentina




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement