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Soluble, High Molecular Weight Polysilsesquioxanes with Carboxylate Functionalities

Published online by Cambridge University Press:  01 February 2011

Kamyar Rahimian ,
Douglas A. Loy  and
David R. Wheeler
Kamyar Rahimian
Affiliation:
Materials Chemistry Department, Sandia National Laboratories, Albuquerque, NM 87185-0888.
Douglas A. Loy
Affiliation:
Catalysis and Chemical Technologies Department, Sandia National Laboratories, Albuquerque, NM 87185-0888, U.S.A.
David R. Wheeler
Affiliation:
Micro-Total-Analytical Systems Department, Sandia National Laboratories, Albuquerque, NM 87185-0888, U.S.A.
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Abstract

High molecular weight polysilsesquioxanes with carboxylate functionalities were prepared by sol-gel polymerization of organotrialkoxysilanes bearing tert-butyl ester groups. Trialkoxysilyl-containing monomers of the type (RO)3Si(CH2)3C(O)OtBu (R = Me, Et) were prepared by hydrosilation of the corresponding vinylic tert-butyl esters CH3CHCH2C(O)OtBu. Acid- or base-catalyzed polymerization of the monomers leads to very high molecular weight polymers with relatively narrow polydispersities. The polymerization results in complete condensation of the alkoxy groups while the tert-butyl ester functionality remains fully intact. Partial or full deprotection of the tert-butyl group can easily be achieved to yield the corresponding carboxylic acid polymers. The ester and carboxylic acid functionalities of these new materials allow for their potential use in a variety of applications such as scavenging of heavy metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 726: Symposium Q – Hybrid Organic-Inorganic Materials , 2002 , Q6.46
Copyright
Copyright © Materials Research Society 2002

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