Based on Polyethyleneimine A Branched Synthetic Polymer

Catalysts Based on Polyethyleneimine A Branched Synthetic Polymer 

Enzymes are compact, globular polymers. Vinyl polymers are extended structures with high intrinsic viscosities. For example, polyvinylpyrrolidone has an intrinsic viscosity of 22 ml g whereas comparable values for pro- 

11) (25). The branching of the polymer is shown schematically in (25). The distribution of amino groups in 25% primary, 50% secondary, and 25% tertiary. The primary amines occur on the outside of the molecule and are easily substituted by acylation and alkylation. 

The next question to be asked was whether or not this binding ability could be translated into correspondingly large acceleration of reaction rates. Royer and Klotz 89) investigated the rates of aminolysis of / -nitrophenyl esters using PEI with pendant apolar groups. The results of this study appear in Table IV. The rate constant for the reaction of lauroyl-PEI with p-nitro- 

First-Order Rate Constants for Amine Acylation by p-Nitrophenyl Esters -  

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V. Catalysts Based on Polyethyleneimine A Branched Synthetic Polymer.. 215... 

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