I D
× COMMENTARY
Digitalization Game ChangersGame Changers
The technologies associated with the Industrial Internet of Things, and…
COVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
ANG fueling station Ingevity (North Charleston, S.C.; www.ingevity.com) has completed…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILESOLIDS PROCESSINGEQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More SHOW PREVIEWS

Comment

Controlled polymerization makes high-performance polysiloxanes

By Tetsuo Satoh |

Polysiloxanes are the main component of important industrial materials, such silicones and organosilicones. In recent years, demand has grown for higher-performance and higher-functionality of organosilicon materials, which require techniques that precisely control the structure of these materials. Although there are techniques capable of selectively forming one type of siloxane bond, such as the cross-condensation method, multistage synthesis has been necessary in order to obtain complex siloxane compounds. Now, Keita Fuchise and colleagues at the Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (IRC3, AIST, Tsukuba City, Japan; irc3.aist.go.jp) have developed a simple method for synthesizing polysiloxanes that have a well-controlled structure. With support from NEDO, the researchers developed a controlled, organo-catalytic living ring-opening polymerization of cyclotrisiloxanes. The reaction takes place at 30°C and uses water as an initiator and strong organic bases, such as amidinines, guanidines, phosphazene bases, and proazaphosphatrane, as catalysts. A variety of polysiloxanes can be produced with controlled number-average molecular weight (from 2.64…
Related Content
Chementator Briefs
ANG fueling station Ingevity (North Charleston, S.C.; www.ingevity.com) has completed construction of a fueling station for low-pressure adsorbed natural gas…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Reduce Explosion Risk in 2 Seconds with In Situ Oxygen Analysis
Tunable Diode Laser Spectroscopy in Critical Applications
Non-Contacting Gas Sensors Minimize the Risk of Corrosion to Plant Equipment.
5 ways to Optimize Production of Polymers and Intermediate Petrochemicals
7 Ways to Achieve Process Safety in Chemical Production

View More

Live chat by BoldChat