Subscribe free to our newsletters via your
. 24/7 Space News .




TECH SPACE
New self-stretching material developed at University of Rochester
by Staff Writers
Rochester NY (SPX) Feb 17, 2015


The material is like a shape-memory polymer because it can be switched between two different shapes.

Although most materials slightly expand when heated, there is a new class of rubber-like material that not only self-stretches upon cooling; it reverts back to its original shape when heated, all without physical manipulation.

The findings were recently published in the journal ACS Macro Letters.

The material is like a shape-memory polymer because it can be switched between two different shapes. "However, unlike other shape-memory polymers, the material does not need to be programmed each cycle--it repeatedly switches shapes, with no external forces, simply upon cooling and heating," said Mitchell Anthamatten, an associate professor of chemical engineering.

Anthamatten and his team built on the success of a recently developed polymer that can also stretch when cooled. The other polymers need to have small loads--or weights--attached in order to direct the shape to be taken. That is not the case with the Rochester polymer, because Anthamatten's team "tricked it into thinking" a load was attached.

To carry out their strategy, the researchers introduced permanent stress inside the material. They began with polymer strands that were loosely connected by bonds called crosslinks that create a network of molecules. The material was stretched with a load attached to give it the desired shape. At that point, they added more crosslinks and cooled the polymer, causing crystallization to occur along a preferred direction.

Anthamatten's team showed that internal crystallization forces are strong enough to stretch the material along one direction. Once cooled below about 50 C, polymer chain segments pack into highly ordered micro-layers called lamellae. This reorganization occurs within a network of polymer chains, causing the material's length to increase by over 15 percent.

"The stress we built into the network takes the place of the load and enables the material to 'remember' the shape it will assume when it's later cooled without a load," said Anthamatten.

Conventional shape-memory polymers need to be reprogrammed after each cycle, but that's not the case with the material developed by Anthamatten and his team. After multiple cycles of cooling and heating, they found that the material assumed its programmed shape and returned to its initial state with no noticeable deviation.

Anthamatten envisions the material being applied to a number of areas in which reversible shape-changes are needed during operations, including biotechnology, artificial muscles, and robotics.

"The next step is to optimize the shape of the polymer material and the energy released during the process," said Anthamatten. "That will be done by adjusting the type and density of crosslinks that tie the individual chains together."

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

.


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






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

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




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





TECH SPACE
Better catalysts, made-to-order
Salt Lake City UT (SPX) Feb 17, 2015
Most of our food, medicine, fuel, plastics and synthetic fibers wouldn't exist without catalysts, materials that open favorable pathways for chemical reactions to run forth. And yet chemists don't fully understand how most catalysts work, and developing new catalysts often still depends on laborious trial-and-error. But in a new study appearing in the journal Science, University of Utah ch ... read more


TECH SPACE
Application of laser microprobe technology to Apollo samples refines lunar impact history

NASA releases video of the far side of the Moon

US Issuing Licenses for Mineral Mining on Moon

LRO finds lunar hydrogen more abundant on Moon's pole-facing slopes

TECH SPACE
The highest plume ever observed on Mars

Mars One cuts list of potential colonists to 100

Mystery Mars plume baffles scientists

Up, Up and Away! First Humans Chosen for Mission to Mars

TECH SPACE
The ISS Menu: Mayo, Espressos, Booze? Cosmonauts Reveal Their Secrets

Sensors Detect Icing Conditions to Help Protect Airplanes

Industry: Risk aversion costs more than 'fast failure'

Boeing's Space Efforts to Be Managed by Newly Created Organization

TECH SPACE
More Astronauts for China

China launches the FY-2 08 meteorological satellite successfully

China's Long March puts satellite in orbit on 200th launch

Countdown to China's new space programs begins

TECH SPACE
Spacesuit woes haunt NASA ahead of crucial spacewalks

Russia Launches Fresh Fruit, Oxygen to Crew on ISS

Space Station 3-D Printed Items, Seedlings Return in the Belly of a Dragon

NASA preparing to reassemble International Space Station

TECH SPACE
Moog offers "SoftRide" for enhanced spacecraft protection during launch

Russian-Ukrainian Satan Rocket to Launch South Korean Satellite as Planned

Leaders share messages, priorities at AFA Symposium

Soyuz Installed at Baikonur, Expected to Launch Wednesday

TECH SPACE
Laser 'ruler' holds promise for hunting exoplanets

The mystery of cosmic oceans and dunes

Scientists predict earth-like planets around most stars

"Vulcan Planets" - Inside-Out Formation of Super-Earths

TECH SPACE
Arachnid Rapunzel: Researchers spin spider silk proteins into artificial silk

Breakthrough may lead to industrial production of graphene devices

New design tool for metamaterials

New self-stretching material developed at University of Rochester




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - 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. 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 All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.