TY - JOUR

T1 - Rheological properties of hydrogels based on ionic liquids

AU - Jastram, A.

AU - Claus, J.

AU - Janmey, P. A.

AU - Kragl, U.

N1 - Funding Information: Funding by the Federal Ministry of Education and Research within RESPONSE “Partnership for Innovation in Implant Technology” ( FKZ 03ZZ0910B ) and the Deutsche Forschungsgemeinschaft (DFG; grant KR 2491/12-2 ) as well as the HERMES research funding of the University of Rostock and the US NSF-16 DMR-1720530 is gratefully acknowledged. We also thank Emile Kraus for technical support.

PY - 2021/1

Y1 - 2021/1

N2 - Hydrogels, based on polymerized ionic liquids, are increasingly used in the medical and pharmaceutical industry as implants, drug delivery systems, contact lens material, bone substitutes and stent coatings. Therefore they need to be biocompatible, flexible and resistant to external stress. In order to meet these requirements, there is a large interest in design, synthesis and characterization of these interesting polymers. In this work, mechanical properties such as gelation kinetics, shear strain resistance, and response to compression and stretching of ten different polymerized ionic liquid-based hydrogels were examined, completing the picture of the rheological behavior of these materials. Interestingly, the investigations of stretching measurements showed a wide range of critical strains leading to failure from 4.8 ± 1.1 to 47.9 ± 15.1%and in compression measurements critical strain from 7.8 ± 3.6 to higher than 59.8 ± 17.3%, as well as a linear viscoelastic range in shear from 14 ± 8 to 267 ± 26%. These results allow improved design with a “choose-the-best-material”-toolbox for medical applications.

AB - Hydrogels, based on polymerized ionic liquids, are increasingly used in the medical and pharmaceutical industry as implants, drug delivery systems, contact lens material, bone substitutes and stent coatings. Therefore they need to be biocompatible, flexible and resistant to external stress. In order to meet these requirements, there is a large interest in design, synthesis and characterization of these interesting polymers. In this work, mechanical properties such as gelation kinetics, shear strain resistance, and response to compression and stretching of ten different polymerized ionic liquid-based hydrogels were examined, completing the picture of the rheological behavior of these materials. Interestingly, the investigations of stretching measurements showed a wide range of critical strains leading to failure from 4.8 ± 1.1 to 47.9 ± 15.1%and in compression measurements critical strain from 7.8 ± 3.6 to higher than 59.8 ± 17.3%, as well as a linear viscoelastic range in shear from 14 ± 8 to 267 ± 26%. These results allow improved design with a “choose-the-best-material”-toolbox for medical applications.

KW - Hydrogel

KW - Mechanical characterization

KW - Polymerized ionic liquids

KW - Rheological characterization

UR - http://www.scopus.com/inward/record.url?scp=85095841216&partnerID=8YFLogxK

U2 - 10.1016/j.polymertesting.2020.106943

DO - 10.1016/j.polymertesting.2020.106943

M3 - Article

AN - SCOPUS:85095841216

VL - 93

JO - Polymer testing

JF - Polymer testing

SN - 0142-9418

M1 - 106943

ER -