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Recent Studies on the Application of Enzymes in the Synthesis of Polyesters

Published online by Cambridge University Press:  15 February 2011

Cary J. Morrow ,
Eugenia M. Brazwell ,
Dianela Filos ,
Juanita Mercure ,
Rosemary Romero  and
J. Shield Wallace
Cary J. Morrow
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Eugenia M. Brazwell
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Dianela Filos
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Juanita Mercure
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
Rosemary Romero
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
J. Shield Wallace
Affiliation:
University of New Mexico, Department of Chemistry, Albuquerque, NM 87131
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Abstract

Enzyme-catalyzed preparation of polymers offers several potentially valuable advantages over the usual polymerization procedures. This paper summarizes our successful use of lipase-catalyzed polycondensations to prepare both a series of achiral [AA-BB]x polyesters from bis(2,2,2- trichloroethyl) alkanedioates and diols and of an optically active, epoxy-substituted polyester having a stereochemical purity estimated to be greater than 96%, from racemic bis(2,2,2-trichloroethyl) trans-3,4-epoxyhexanedioate and 1,4-butanediol. All of the reactions were carried out at ambient temperature in anhydrous, low to intermediate polarity, organic solvents such as ether, THF, 2-ethoxyethyl ether, dibenzyl ether, o-dichlorobenzene, or methylene choride, using porcine pancreatic lipase (PPL) as the catalyst. The molecular weight achieved by the polycondensation is limited by accumulation of the trihaloethanol that forms as the reaction progresses, probably because it frees enzyme-bound water permitting hydrolysis of the polymer to occur. This problem has been alleviated by using a high boiling solvent and removing the alcohol by placing the re'action mixture under vacuum.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 218: Symposium V – Materials Synthesis Based on Biological Processes , 1990 , 31
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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2. For a comprehensive list of references, see Morrow, C. J. and Wallace, J. S. in Biocatalysis, edited by Abramowicz, D. A. (Van Nostrand Reinhold, New York, 1990), pp. 25–62.Google Scholar
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