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Novel cellulose derivatives. II. synthesis and characteristics of mono-functional cellulose propionate segments

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Abstract

Mono-functional cellulose propionate segments for use in ter- or star-block polymers have been prepared by the depolymerization (step 1) of cellulose propionate in homogeneous phase using a mixture of HBr and propionic anhydride in methylene chloride solution. The anomeric mixture of glycosyl bromide has subsequently (step 2) been hydrolyzed in aqueous acetone. Functionality was determined by H-NMR spectroscopy of triethyl silane derivatives in combination with gel permeation chromatography. The cellulose ester segments were semi-rigid, highly crystalline materials with melting points between 180° and 250°C. The lowest useful segment size, based on crystallinity and Mark-Houwink-Sakurada exponential factor, appeared to be DP 20, with an optimum around DP 40 to 50.

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Authors and Affiliations

  1. Department of Wood Science and Forest Products, and Biobased Materials Center, Virginia Tech, Blacksburg, Virginia, USA

    Willer De Oliveira & Wolfgang G. Classer

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  1. Willer De Oliveira
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  2. Wolfgang G. Classer
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Additional information

Part I has been published in theJ. Appl. Polym. Sci.,49, 1671 (1993).

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De Oliveira, W., Classer, W.G. Novel cellulose derivatives. II. synthesis and characteristics of mono-functional cellulose propionate segments. Cellulose 1, 77–86 (1994). https://doi.org/10.1007/BF00818800

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