Highly Branched Polyisobutylene by Radical Polymerization under Li[CB11(CH3)(12)] Catalysis

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F12%3A00386198" target="_blank" >RIV/61388963:_____/12:00386198 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/ma301850c" target="_blank" >http://dx.doi.org/10.1021/ma301850c</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/ma301850c" target="_blank" >10.1021/ma301850c</a>

Result language
angličtina
Original language name
Highly Branched Polyisobutylene by Radical Polymerization under Li[CB11(CH3)(12)] Catalysis
Original language description
In the presence of a nonoxidizing radical initiator, azo-tert-butane, and a high concentration of LiCB11(CH3)(12), isobutylene undergoes thermal or light-induced radical polymerization to b-PIB, a highly branched polymer of modest molecular weight (mostly a few thousand and up to similar to 25 000 g/mol based on GPC with polystyrene standards). The structure of b-PIB was elucidated by NMR spectroscopy of a low-molecular-weight fraction. The polymer is branched on every carbon atom of the main chain; onechain end carries an isobutenyl group, and the other carries a tert-butyl group originating in the initiator. The branches are short segments of l-PIB (linear polyisobutylene), on the average composed of five IB units. A mechanism of formation if this dendrimer-like structure is proposed.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CC - Organic chemistry
OECD FORD branch
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Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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