4.7 Article

Well-defined carbohydrate-based polymers in calcium carbonate crystallization: Influence of stereochemistry in the polymer side chain on polymorphism and morphology

Journal

EUROPEAN POLYMER JOURNAL
Volume 69, Issue -, Pages 628-635

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2015.02.010

Keywords

Crystallization of calcium carbonate; Stereochemistry; Carbohydrate-based polymers; RAFT

Funding

  1. Deutsche Forschungsgemeinschaft (DFG)
  2. Graduate School of Excellence MAINZ

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In this work we demonstrate the remarkable phase control on the crystallization of calcium carbonate by the stereochemistry of carbohydrate-based polymers. The polymers (poly(2-(2,3,4,6-tetra-O-acetyl-beta-D-glucosyloxy)ethyl methacrylate) and poly(2-(2,3,4,6-tetra-O-acetyl-beta-D-galactosyloxy)ethyl methacrylate)) have been synthesized from the respective glucose or galactose containing monomers (3 step synthesis) by RAFT polymerization leading to well-defined carbohydrate-based polymers with number averages of the molecular weights (M-w) of 10,000-18,000 g/mol and a dispersities (D) from 1.1 to 1.2. For the deprotected polymers we found differences in the phase selection of calcium carbonate. We found that this effect is based on the chelating character of the hydroxyl groups of the pyranoses and their individual orientation, as demonstrated by comparison of the protected and unprotected polymers in crystallization experiments as well as computer assisted simulations. (C) 2015 Elsevier Ltd. All rights reserved.

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