Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hybrid coatings increase hardness of plastic and allow properties to be tailored

17.05.2006


Mechanical behaviour of hybrid SiO2-PMMA coatings measured by nanoindentation



Increasing the surface hardness of many materials opens them up for use in a wide variety of new applications. These new hybrid materials could be used in areas like anticorrosion coatings for metals, scratch and abrasion resistant coatings for plastics, antistatic films plus colour decorative coatings for glasses and plastics.

The sol-gel method of materials preparation is a suitable technique that can be used to obtain composite materials with reinforced properties and produce hybrid coatings. It is capable of producing materials that combine the complementary properties of the inorganic and organic materials.


Engineering plastics such as polymethylmetacrylate or PMMA are distinct candidate materials that can benefit from reinforcement with inorganic materials. Silica (SiO2), is a suitable reinforcing material that was used in this investigation.

In this paper researchers from Universidad Autonoma de Sinaloa, Fuente de Poseidon y Prol and Centro de Investigacion y Estudios Avanzados del Instituto Politécnico Nacional, J.L. Almaral-Sanchez, M. Lopez-Gomez, R. Ramirez-Bon, J. Munoz-Saldana, prepared hybrid SiO2-PMMA coatings using the sol-gel method and measured coating hardness. They applied two depth sensing indentation (DSI) systems, each one using indenters with different geometry and size, to analyze the mechanical behaviour of hybrid coatings of SiO2-PMMA with different molar ratios. Applying an indentation model, the absolute hardness of the coatings was evaluated using both systems as a function of the PMMA content of the hybrid films.

From the indentation measurements the researchers found that the mechanical properties of the hybrid coatings were improved in comparison with those of conventional acrylics. Hardness of the hybrid coatings was from three times to more than one order of magnitude higher than the acrylic hardness, depending on the molar ratio. An extra hardening phenomenon was measured at the surface of the coatings, which is probably due to an enrichment of silica at this region. Finally they found that hardness of the coatings decreases monotonically with the PMMA content. These results allow hybrid coatings to be made with mechanical properties tailored to the individual application.

Dr. Ian Birkby | EurekAlert!
Further information:
http://www.azonetwork.com

More articles from Materials Sciences:

nachricht Reliable molecular toggle switch developed
30.03.2017 | Karlsruher Institut für Technologie (KIT)

nachricht Researchers shoot for success with simulations of laser pulse-material interactions
29.03.2017 | DOE/Oak Ridge National Laboratory

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Challenging European Research Project to Develop New Tiny Microscopes

The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.

To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

NASA laser communications to provide Orion faster connections

30.03.2017 | Physics and Astronomy

Reusable carbon nanotubes could be the water filter of the future, says RIT study

30.03.2017 | Studies and Analyses

Unique genome architectures after fertilisation in single-cell embryos

30.03.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>