scholarly journals Hybrid Polymer-Network Hydrogels with Tunable Mechanical Response

Polymers ◽  
2016 ◽  
Vol 8 (3) ◽  
pp. 82 ◽  
Author(s):  
Sebastian Czarnecki ◽  
Torsten Rossow ◽  
Sebastian Seiffert
Keyword(s):  
Mechanical Response ◽  
Polymer Network ◽  
Hybrid Polymer

Enhanced film forming ability of benzoxazine-urethane hybrid polymer network by sequential cure method

2014 ◽  
Vol 131 (13) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sarawut Rimdusit ◽  
Manop Sudjidjune ◽  
Chanchira Jubsilp ◽  
Sunan Tiptipakorn
Keyword(s):  
Polymer Network ◽  
Hybrid Polymer ◽  
Film Forming

The Effects of pH and Ionic Strength of Swelling of Cationic Gels

2016 ◽  
Vol 08 (05) ◽  
pp. 1650059 ◽  
Author(s):  
A. D. Drozdov ◽  
J. Declaville Christiansen
Keyword(s):  
Mechanical Response ◽  
Ion Pairs ◽  
Polymer Network ◽  
Molar Fraction ◽  
Cationic Polyelectrolyte ◽  
Polyelectrolyte Gel ◽  
Effects Of Ph ◽  
Mobile Anions ◽  
Polyelectrolyte Effect ◽  
Mobile Ions

A model is reported for the mechanical response of a cationic polyelectrolyte gel subjected to swelling in a water bath with an arbitrary pH and an arbitrary concentration of a monovalent salt. A gel is treated as a three-phase medium consisting of a polymer network, solvent (water), and solute (mobile ions). Transport of solvent and solute is thought of as their diffusion through the network accelerated by the electric field formed by mobile ions and bound charges and accompanied by chemical reactions (self-ionization of water molecules, protonation of functional groups, and formation of ion pairs between fixed cations and mobile anions). Material constants in the governing equations are determined by fitting equilibrium swelling diagrams on several copolymer gels with vinylimidazole component. Simulation demonstrates that the anti-polyelectrolyte effect (nonmonotonic changes in degree of swelling with molar fraction of salt) can be observed in cationic gels and core-shell microgels.

Study on phase behavior–impact strength relationship of unsaturated polyester/polyurethane hybrid polymer network

1995 ◽  
Vol 38 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Mei Xuan Xu ◽  
Wen Guang Liu ◽  
Yun Lin Guan ◽  
Zuo Peng Bi ◽  
Kang De Yao
Keyword(s):  
Impact Strength ◽  
Phase Behavior ◽  
Unsaturated Polyester ◽  
Polymer Network ◽  
Hybrid Polymer ◽  
Relationship Of ◽  
Strength Relationship

Investigation of pH-sensitive drug delivery system of chitosan/gelatin hybrid polymer network

1995 ◽  
Vol 38 (1) ◽  
pp. 77-82 ◽  
Author(s):  
Kang De Yao ◽  
Yu Ji Yin ◽  
Mei Xuan Xu ◽  
Yu Feng Wang
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Delivery System ◽  
Polymer Network ◽  
Ph Sensitive ◽  
Hybrid Polymer

Energetic hybrid polymer network (EHPN) through facile sequential polyurethane curation based on the reactivity differences between glycidyl azide polymer and hydroxyl terminated polybutadiene

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 11032-11039 ◽  
Author(s):  
Abbas Tanver ◽  
Fida Rehman ◽  
Aisha Wazir ◽  
Syed Khalid ◽  
Song Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Network ◽  
Hybrid Polymer ◽  
Glycidyl Azide Polymer ◽  
Glycidyl Azide

To improve the thermo-mechanical properties of glycidyl azide polymer and hydroxyl terminated polybutadiene based propellants, a facile sequential polymerization approach was used to prepare an energetic hybrid polymer network by stepwise curation.

scholarly journals Degradation-Induced Actuation in Oxidation-Responsive Liquid Crystal Elastomers

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 420 ◽  
Author(s):  
Mahjabeen Javed ◽  
Seelay Tasmim ◽  
Mustafa K. Abdelrahman ◽  
Cedric P. Ambulo ◽  
Taylor H. Ware
Keyword(s):  
Liquid Crystal ◽  
Mechanical Response ◽  
Polymer Network ◽  
Orthogonal Expansion ◽  
Aqueous Environment ◽  
Wide Range ◽  
Anisotropic Mechanical Properties ◽  
Liquid Crystal Elastomers ◽  
Shape Changes

Stimuli-responsive materials that exhibit a mechanical response to specific biological conditions are of considerable interest for responsive, implantable medical devices. Herein, we report the synthesis, processing and characterization of oxidation-responsive liquid crystal elastomers that demonstrate programmable shape changes in response to reactive oxygen species. Direct ink writing (DIW) is used to fabricate Liquid Crystal Elastomers (LCEs) with programmed molecular orientation and anisotropic mechanical properties. LCE structures were immersed in different media (oxidative, basic and saline) at body temperature to measure in vitro degradation. Oxidation-sensitive hydrophobic thioether linkages transition to hydrophilic sulfoxide and sulfone groups. The introduction of these polar moieties brings about anisotropic swelling of the polymer network in an aqueous environment, inducing complex shape changes. 3D-printed uniaxial strips exhibit 8% contraction along the nematic director and 16% orthogonal expansion in oxidative media, while printed LCEs azimuthally deform into cones 19 times their original thickness. Ultimately, these LCEs degrade completely. In contrast, LCEs subjected to basic and saline solutions showed no apparent response. These oxidation-responsive LCEs with programmable shape changes may enable a wide range of applications in target specific drug delivery systems and other diagnostic and therapeutic tools.

scholarly journals A hybrid polymer gel with controlled rates of cross-link rupture and self-repair

2006 ◽  
Vol 4 (13) ◽  
pp. 373-380 ◽  
Author(s):  
Farrell R Kersey ◽  
David M Loveless ◽  
Stephen L Craig
Keyword(s):  
Single Molecule ◽  
Mechanical Response ◽  
Polymer Gel ◽  
Hybrid Polymer ◽  
Ligand Complex ◽  
Hybrid Gels ◽  
Cross Links ◽  
Modular Platform ◽  
The Individual ◽  
Metal Ligand

A family of hybrid polymer gels is described, in which covalent cross-links create a permanent, stiff scaffold onto which reversible metal–ligand coordinative cross-links are added. The reversible metal–ligand interactions are shown to bear mechanical stress within the hybrid gel, and relaxations in response to that applied stress are consistent with the stress-free kinetics of ligand exchange in systems that model the reversible cross-links. The stress-induced dissociation of a model metal–ligand complex is examined by a single-molecule force spectroscopy, and its mechanical response is compared with a previously studied complex. The mechanical response of the individual interactions is relevant to those found in the family of hybrid gels, and the modular platform is therefore suitable for the study of stress-induced molecular dissociations, and their subsequent repair, within a macroscopic material of fixed structure.

scholarly journals Effect of hybrid polymer coating of Bioglass® foams on mechanical response during tensile loading

2015 ◽  
Vol 114 (sup1) ◽  
pp. S63-S69 ◽  
Author(s):  
L. Bertolla ◽  
Z. Chlup ◽  
L. Stratil ◽  
A. R. Boccaccini ◽  
I. Dlouhý
Keyword(s):  
Polymer Coating ◽  
Mechanical Response ◽  
Tensile Loading ◽  
Hybrid Polymer
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