These polymers can result in an astonishing array of materials, customizable to almost any specification. However, the flood of options could be overwhelming, without a theoretical framework to guide research. UC Santa Barbara scientists Glenn Fredrickson and Kris Delaney address that issue in their paper, "Multiblock Polymers: Panacea or Pandora's Box?" The paper appears in the latest edition of the journal Science.
The variety of monomers that can be used to construct multiblock polymers can yield a multitude of materials with different properties.
Credit: Peter Allen
Polymers are large molecules comprised of repeating sequences of monomers. When more than one monomer type is present and the dissimilar monomers are organized and chemically bound into "blocks," the resulting multiblock polymers can serve as the basis for a multitude of materials, to be used in applications as diverse as tennis shoes and solar cells. Since the genesis of polymer science in the 1950's, when scientists had only limited numbers of monomers, and, methods to choose from in creating multiblock polymers, the field has expanded. Scientists may now create materials using monomers from a variety of sources, from petroleum to renewable feedstocks such as sugar or cellulose.
"The Pandora's box is that you have so many monomers that you can put together and in so many block sequences," said Fredrickson, a professor of chemical engineering, explaining that the properties will vary according to sequence and by virtue of the interactions among the blocks. Because multiblock copolymers can "self-assemble" into nanometer-sized domains, these materials can exhibit remarkable combinations of properties, such as soft, strong, and elastic –– as in tennis shoe soles or skateboard wheels. For higher-tech applications, the researchers are currently partnering with the company Intel to develop multiblock polymers that will enable patterning of microelectronic devices at finer scales and lower cost.
The researchers, who also include scientists from the University of Minnesota and the University of Texas, suggest an approach that addresses materials performance needs by combining predictive computer simulation methods with advanced synthetic and structural characterization tools.
"Our simulation methods for predicting the self-assembled structures of multiblock polymers are quite advanced, and we are getting better at relating those nano-structures to the properties of the material," said Fredrickson. "Multiblock polymers are extremely versatile –– there is enormous latitude of design freedom, and it's very promising in terms of developing materials with truly unique properties."
Sonia Fernandez | EurekAlert!
20.11.2017 | Washington University in St. Louis
Carefully crafted light pulses control neuron activity
20.11.2017 | University of Illinois at Urbana-Champaign
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
20.11.2017 | Earth Sciences
20.11.2017 | Earth Sciences
20.11.2017 | Life Sciences