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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1181| TOWARDS THE SINTHESIS OF BLOCK COPOLYMERS USING OXOAMMONIO SALTS | |
| JOSE BONILLA CRUZ TANIA ERNESTINA LARA CENICEROS ENRIQUE SALDIVAR GUERRA | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Block copolymers | |
| Great interest has been focused on end-functional polymers as prepolymer for the synthesis of block and graft copolymers, polymer networks, and chain-extended polymers1. Particularly, few works2 have explored the synthesis of block copolymers of polydimethylsiloxane-block-polystyrene (PDMS-b-PSt), or polyethylenglycol-blockpolystyrene (PEG-b-PSt) using prepolymer of PDMS or PEG as a macroinitiator in the presence of nitroxide radicals and styrene monomer (St). On the other hand, considerable efforts have been committed for the synthesis of this kind of block copolymers: i) some approaches involve first the chemical modification of PDMS3 or PEG4 with azo-initiator moieties obtaining thus a macroinitiator, in order to form PDMS-b-PSt or PEG-b-PSt in the presence of MTEMPO (4-methoxy-2,2,6,6,tetramethylpiperidine-1-oxyl) and St; ii) anionic ring-opening polymerization in combination with nitroxide chemistry have been used in the synthesis of hexamethylciclotrisiloxane-styrene diblocks5; iii) The modification of a PDMS (previously synthesized by anionic polymerization) with a difunctional allyl ether6, derivative of a difunctional initiator developed by Hawker7. These macroalkoxyamines in the presence of St leads to PDMS-b-PSt, in which the growth to the PSt block was controlled by nitroxide radicals. All these efforts involve both ingenious structures and numerous synthesis pathways. | |
| 2009 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Manzanillo_2009_b.pdf | 973.65 kB | Adobe PDF | Visualizar/Abrir |