Preparation of hydrophilic polymer networks by post-curing reaction

1992 ◽  
Vol 45 (6) ◽  
pp. 1005-1010 ◽  
Author(s):  
Andreas G. Andreopoulos
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer ◽  
Curing Reaction

Ultra-stretchable hydrogels with reactive liquid metals as asymmetric force-sensors

2019 ◽  
Vol 6 (3) ◽  
pp. 618-625 ◽  
Author(s):  
Hao Peng ◽  
Yumeng Xin ◽  
Jun Xu ◽  
Huaizhi Liu ◽  
Jiuyang Zhang
Keyword(s):  
Liquid Metals ◽  
Polymer Networks ◽  
Synthetic Methods ◽  
Force Sensors ◽  
Hydrophilic Polymer ◽  
Sensing Applications ◽  
Reactive Liquid ◽  
Asymmetric Force

Liquid metals (LMs) are used as liquid fillers in hydrophilic polymer networks to realize ultra-stretchable hydrogels as asymmetric force-sensors. The existence of liquid metals endows the hydrogel with unique features in synthetic methods and sensing applications.

scholarly journals Immobilization of myoglobin from horse skeletal muscle in hydrophilic polymer networks

2007 ◽  
Vol 107 (2) ◽  
pp. 881-890 ◽  
Author(s):  
Angelines Castro-Forero ◽  
David Jiménez ◽  
Juan López-Garriga ◽  
Madeline Torres-Lugo
Keyword(s):  
Skeletal Muscle ◽  
Polymer Networks ◽  
Hydrophilic Polymer

scholarly journals Architectured Shape-Memory Hydrogels with Switching Segments Based on Oligo(ε-caprolactone)

MRS Advances ◽  
2016 ◽  
Vol 1 (27) ◽  
pp. 2011-2017 ◽  
Author(s):  
Maria Balk ◽  
Marc Behl ◽  
Ulrich Nöchel ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Material Properties ◽  
Biomedical Applications ◽  
Polymer Networks ◽  
Hydrophilic Polymer ◽  
Potential Candidate ◽  
Thermal Crosslinking ◽  
Porous Microstructure ◽  
Image Position ◽  
Form Stability

ABSTRACTShape-memory hydrogels (SMHs) are potential candidate materials for biomedical applications as they can mimic the elastic properties of soft tissue and exhibit shape transformations at body temperature. Here we explored, whether architectured SMHs can be designed by incorporating oligo(ε-caprolactone) (OCL, ${\overline M _n}$ = 4500 g·mol-1, Tm = 54 °C) side chains as switching segment into hydrophilic polymer networks based on N-vinylpyrrolidone as backbone forming component and oligo(ethylene glycol)divinylether (OEGDVE, ${\overline M _n}$ = 250 g·mol-1) as crosslinker. By utilizing NaCl and NaHCO3 as porogene during thermal crosslinking architectured hydrogels having pore diameters between 30 and 500 µm and wall thicknesses ranging from 10 to 190 µm in the swollen state were synthesized. According to the porous microstructure, a macroscopic form stability was obtained when the polymer networks were swollen until equilibrium in water. Material properties were investigated as function of the OCL content, which was varied between 20 and 40 wt%. In compression experiments the architectured hydrogels exhibited strain fixity and strain recovery ratios above 80%. These architectured SMHs might enable biomaterial applications as smart implants with the recovery of bulky structures from compact shapes.

Soluble chain fractions in hydrophilic polymer networks: origin and effect on dynamic uptake overshoots

Polymer ◽  
1990 ◽  
Vol 31 (7) ◽  
pp. 1288-1293 ◽  
Author(s):  
Alec B. Scranton ◽  
John Klier ◽  
Nikolaos A. Peppas
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer

scholarly journals Design of dual hydrophobic–hydrophilic polymer networks for highly lubricious polyether-urethane coatings

2019 ◽  
Vol 111 ◽  
pp. 82-94 ◽  
Author(s):  
Peter T.M. Albers ◽  
Stefan P.W. Govers ◽  
Jozua Laven ◽  
Leendert G.J. van der Ven ◽  
Rolf A.T.M. van Benthem ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer

Shape-Memory Hydrogels: Evolution of Structural Principles To Enable Shape Switching of Hydrophilic Polymer Networks

2017 ◽  
Vol 50 (4) ◽  
pp. 723-732 ◽  
Author(s):  
Candy Löwenberg ◽  
Maria Balk ◽  
Christian Wischke ◽  
Marc Behl ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Polymer Networks ◽  
Hydrophilic Polymer ◽  
Structural Principles

scholarly journals Curing Reaction and Dielectric Properties of Rigid and Elastic Liquid Crystal Epoxy Networks Modified with Nanofillers

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Magdalena Włodarska
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Liquid Crystalline ◽  
Polymer Networks ◽  
Calorimetric Study ◽  
Pimelic Acid ◽  
Good Tool ◽  
Epoxy Networks ◽  
Curing Reaction ◽  
Liquid Crystalline Epoxy

The aim of the paper is to compare the progress of the curing reaction and the dielectric properties of liquid crystalline epoxy networks of different elasticity and to investigate how modification with nanofillers influences their properties. The study focuses on a liquid crystalline epoxy monomer with four aromatic rings in the mesogen, cross-linked with 4,4′-diaminodiphenylmethane (DDM) and pimelic acid (PA) to produce rigid and elastic polymer networks. The obtained results are compared to networks modified with nanofillers (diphenyl aluminum phosphate nanorods). The curing process is monitored in situ with broadband dielectric spectroscopy, which is a good tool to view the progress of the reaction. Two stages with different reaction dynamics are observed in the studied cases. Dielectric properties of the products cured with two chosen agents show significant differences in the obtained parameters (activation energy, glass transition, and fragility index) as well as in the dynamics of the α and β relaxations. Although the curing agent is the main factor determining the properties of the product, the nanofiller additive also modifies the values of specific parameters that characterize both the process of the reaction and the properties of the final composites. Particularly, adding the nanofiller raises the glass transition temperature in both the cases. The obtained results are in good agreement with the earlier calorimetric study.

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