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Post‐Polymerization of Urease‐Induced Calcified, Polymer Hydrogels
Author(s) -
Rauner Nicolas,
Buenger Lea,
Schuller Stefanie,
Tiller Joerg C.
Publication year - 2015
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201400426
Subject(s) - self healing hydrogels , materials science , acrylamide , polymerization , polymer , acrylic acid , polymer chemistry , chemical engineering , composite material , calcium carbonate , monomer , engineering
Urease‐induced calcification is an innovative method to artificially produce highly filled CaCO 3 ‐based composite materials by intrinsic mineralization of hydrogels. The mechanical properties of these hybrid materials based on poly(2‐hydroxyethylacrylate) cross‐linked by triethylene glycol dimethacrylate are poor. Increasing the degree of calcification to up to 94 wt% improves the Young's moduli (YM) of the materials from some 40 MPa to more than 300 MPa. The introduction of calcium carbonate affine groups to the hydrogel matrix by copolymerizing acrylic acid and [2‐(methacryloyloxy) ethyl]trimethylammonium chloride, respectively, does not increase the stiffness of the composites. A Young's modulus of more than 1 GPa is achieved by post‐polymerization (PP) of the calcified hydrogels, which proves that the size of the contact area between the matrix and calcium carbonate crystals is the most crucial parameter for controlling the stiffness of hybrid materials. Switching from low T g to high T g hydrogel matrices (based on poly( N,N ‐dimethyl acrylamide)) results in a YM of up to 3.5 GPa after PP.