Plastics Portal For Buying And Selling Plastic Products
CONNECTING BUSINESSES IN THE WORLD OF PLASTICS
Go to->Home - PlasticNews
A polymer that can repeatedly heal itself when exposed to ultraviolet light (25-1-2011)
 
A polymer that can heal itself over and over again when exposed to ultraviolet light has been developed by materials researchers at Carnegie Mellon University and Kyushu University. The substance could potentially be used to create products that repair themselves when damaged, including self-healing medical implants or parts for vehicles such as aircraft.

When the polymer is cracked it can swiftly be prepared without the need for heat or glues by simply pressing both sides of the material together and applying UV light. Researchers found that they could break the material into pieces and then reassemble it at least five times. They believe that with further development they could create a material that could heal itself many more times. Other self-healing materials have relied on microcapsules containing a healing agent, which break open when a crack forms. However, once the healing agent has been used up, the material loses its self-healing ability. The new polymer is cross-linked with trithiocarbonate bonds -- carbon atoms bonded to three sulphur atoms, two of which use their second bonding position to attach to another carbon atom. When UV light is applied, one of the carbon-sulphur bonds is broken, producing two radicals -- molecules with a free, unpaired electron. These radicals then react with other thrithiocarbonate groups to form new carbon-sulphur bonds, while breaking others to form more free radicals.

The experiments were conducted in a pure nitrogen atmosphere because, so far, the polymer can only repair itself in an oxygen-free environment. But it is hoped that other polymers could be developed that would heal themselves under normal atmospheric conditions.
Previous News Previous News
Next News Next News
Forward to friend Forward this news to friend Print this News Print this news
Back
Back To Recent News Archives
Disclaimer
Recent News
• Mexico’s Polyethylene suppliers denounce oxo-biodegradable technology
• Players react to arrival of PP, PE cargoes from new capacities in China
• Lotte Chemical pays lowest spot premium by a South Korean in n about 5 months
• Polymer can change color, return to original in less than a second with temperature changes
• Underwater self-healing polymer could allow longer lasting biomedical implants
  
Available
UM-9774 Film width max: 1540 mm For details & image of the machine, pl...
UM-9929 50 mm Blown Film extruder for the manufacture of polypropylene fi...
UM-9924 Model: Rotopak 2000 - Printing width: 1120 mm - Printing repea...
UM-9925 120" Gloucester 421 Bag Machine, Rebuilt by J & C
UM-8750 - Film production quantity maximum per month: approx output: 40 t...
UM-9922 Model: JSW J-350E - Quantity: 1 - Year: 1995
UM-9921 For more details please see next pages
UM-9920 80 ton, 90 ton, 120 ton, 150 ton Injection molding machines more ...
UM-9919 - With 150 mm DS extruder - 33D - Flex Lip Die - 2950 mm x 500...
UM-9918 - (1) Used 4.5" Sterling Extruder - 40:1 L/D - Electrically hea...