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Biosynthesis of poly-(R)-3-hydroxyalkanoate: An emulsion polymerization (1993)

Koning, G. J. M. ; Maxwell, Ian A.

Springer

Journal of polymers and the environment 1 (1993), S. 223-226

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ISSN: 1572-8900

Keywords: Emulsion polymerization ; poly(hydroxyalkanoate) ; latex ; biosynthesis

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Poly-(R)-3-hydroxyalkanoates (PHAs) are bacterial storage polyesters, which are accumulated by a wide variety of microorganisms as a reserve of carbon and energy. Currently, these biopolymers are receiving much attention because of their potential application as biodegradable and biocompatible plastics. The polymer appears as submicron intracellular granules. The biosynthesis of these granules has been studied extensively but many observations remain inexplicable. This paper draws an analogy between the process of emulsion polymerization and that of granule formation. This analogy may explain many of the unknown features of granule formation and may also lead to useful applications of granules as latex products.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01458030

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Prediction of polymer composition in batch emulsion copolymerization (1994)

Noël, Lilian F. J. ; Van Zon, Jan M. A. M. ; Maxwell, Ian A. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1009-1026

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ISSN: 0887-624X

Keywords: emulsion copolymerization ; monomer partitioning ; composition drift ; modelling ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Monomer partitioning in emulsion copolymerization plays a key role in determining composition drift and polymerization rates. The combination of recently developed thermodynamically based monomer partitioning relationships with mass balance equations, makes predictions of monomer partitioning in emulsion copolymerizations possible in terms of monomer mole fractions and monomer concentrations in the particle and aqueous phases. Using this approach, the effects of monomer to water ratios and polymer volumes on the monomer mole fraction within the polymer particle phase in a nonpolymerizing system at thermodynamic equilibrium can be determined. Comparison of these monomer partitioning predictions with experiments for the monomer system methyl acrylate - vinyl acetate shows good agreement. Furthermore, composition drift occurring in a polymerizing system as a function of conversion can be predicted if the assumption is made that equilibrium is maintained during reaction. Comparison of predictions with experimental results for emulsion copolymerizations of the monomer systems methyl acrylate - vinyl acetate and methyl acrylate - indene shows good agreement. © 1994 John Wiley & Sons, Inc.

Additional Material: 8 Ill.