Facile Synthesis of Tough Double Network Hydrogel

MRS Advances ◽  
2016 ◽  
Vol 1 (27) ◽  
pp. 1953-1958 ◽  
Author(s):  
Jilong Wang ◽  
Junhua Wei ◽  
Jingjing Qiu
Keyword(s):  
Compressive Strength ◽  
Compressive Property ◽  
Natural Polymers ◽  
Facile Synthesis ◽  
Double Network ◽  
High Toughness ◽  
Synthetic Hydrogel ◽  
Hydrogel Network ◽  
Novel Method ◽  
Poly Acrylamide

ABSTRACTIn this paper, a facile and novel method was developed to fabricate high toughness and stiffness double network hydrogels made of ionical-linked natural hydrogel and synthetic hydrogel. The synthetic hydrogel network is formed firstly, and then the gel is soaked in the ionic solution to build second network to form double network hydrogel with high toughness and stiffness. Two different natural polymers, alginate and chitosan, are employed to build rigid and brittle network and poly(acrylamide) is used as soft network in double network hydrogel. The compressive strength of Calcium alginate/poly(acrylamide) double network hydrogels is increased twice than that of poly(acrylamide) single network hydrogels, and the Ca2+ ionically cross-linked alginate is the key to improve the compressive property of double network hydrogels as a sacrificial bond. However, the chitosan/poly(acrylamide) double network hydrogels exhibit no enhancement of compressive strength comparing to poly(acrylamide) single network hydrogels.

COMPAX

Alloy Digest ◽  
1988 ◽  
Vol 37 (3) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tool Steel ◽  
Dimensional Stability ◽  
Heat Treating ◽  
High Toughness ◽  
Steel Corporation

Abstract COMPAX is a chromium-molybdenum shock-resistant tool steel characterized by high toughness, good wear resistance, good through hardening and good dimensional stability during hardening. This datasheet provides information on composition, physical properties, hardness, elasticity, and compressive strength. It also includes information on heat treating, machining, joining, and surface treatment. Filing Code: TS-488. Producer or source: Uddeholm Steel Corporation.

scholarly journals Transcutaneous Drug Delivery Systems Based on Collagen/Polyurethane Composites Reinforced with Cellulose

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1845
Author(s):  
Narcis Anghel ◽  
Valentina Maria Dinu ◽  
Liliana Verestiuc ◽  
Irene Alexandra Spiridon
Keyword(s):  
Drug Delivery ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Metal Complex ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Fickian Diffusion ◽  
Mechanical Resistance ◽  
Natural Polymers ◽  
Transcutaneous Drug Delivery

Designing composites based on natural polymers has attracted attention for more than a decade due to the possibility to manufacture medical devices which are biocompatible with the human body. Herein, we present some biomaterials made up of collagen, polyurethane, and cellulose doped with lignin and lignin-metal complex, which served as transcutaneous drug delivery systems. Compared with base material, the compressive strength and the elastic modulus of biocomposites comprising lignin or lignin-metal complex were significantly enhanced; thus, the compressive strength increased from 61.37 to 186.5 kPa, while the elastic modulus increased from 0.828 to 1.928 MPa. The release of ketokonazole from the polymer matrix follows a Korsmeyer–Peppas type kinetics with a Fickian diffusion. All materials tested were shown to be active against pathogenic microorganisms. The mucoadhesiveness, bioadhesiveness, mechanical resistance, release kinetic, and antimicrobial activity make these biocomposites to be candidates as potential systems for controlled drug release.

scholarly journals Reduced Graphene Oxide-Based Double Network Polymeric Hydrogels for Pressure and Temperature Sensing

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3162 ◽  
Author(s):  
Wei Liu ◽  
Xiaoyuan Zhang ◽  
Gang Wei ◽  
Zhiqiang Su
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Mechanical Deformation ◽  
Temperature Sensors ◽  
Carboxymethyl Chitosan ◽  
Temperature Sensitive ◽  
Facile Synthesis ◽  
Bending Properties ◽  
Double Network ◽  
Reduced Graphene

We demonstrate the fabrication of novel reduced graphene oxide (rGO)-based double network (DN) hydrogels through the polymerization of poly(N-isopropylacrylamide) (PNIPAm) and carboxymethyl chitosan (CMC). The facile synthesis of DN hydrogels includes the reduction of graphene oxide (GO) by CMC, and the subsequent polymerization of PNIPAm. The presence of rGO in the fabricated PNIPAm/CMC/rGO DN hydrogels enhances the compressibility and flexibility of hydrogels with respect to pure PNIPAm hydrogels, and they exhibit favorable thermoresponsivity, compressibility, and conductivity. The created hydrogels can be continuously cyclically compressed and have excellent bending properties. Furthermore, it was found that the hydrogels are pressure- and temperature-sensitive, and can be applied to the design of both pressure and temperature sensors to detect mechanical deformation and to measure temperature. Our preliminary results suggest that these rGO-based DN hydrogels exhibit a high potential for the fabrication of soft robotics and artificially intelligent skin-like devices.

An expeditious one-pot synthesis of pyrido[2,3-d]pyrimidines using Fe3O4–ZnO–NH2–PW12O40 nanocatalyst

2019 ◽  
Vol 43 (3-4) ◽  
pp. 135-139
Author(s):  
Pegah Farokhian ◽  
Manouchehr Mamaghani ◽  
Nosrat Ollah Mahmoodi ◽  
Khalil Tabatabaeian ◽  
Abdollah Fallah Shojaie
Keyword(s):  
Electron Microscopy ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
Pyrimidine Derivatives ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Novel Method ◽  
Operational Simplicity

An efficient protocol for the facile synthesis of a series of pyrido[2,3- d]pyrimidine derivatives has been developed applying Fe3O4–ZnO–NH2–PW12O40 nanocatalyst in water. This novel method has the benefits of operational simplicity, green aspects by avoiding toxic solvents and high to excellent yields of products. Fe3O4–ZnO–NH2–PW12O40 was synthesized and characterized by Fourier transform infrared, X-ray diffraction, vibrating sample magnetometer, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy analyses. The nanocatalyst is readily isolated and recovered from the reaction mixture by an external magnet.

Preparation of open cell rigid polyurethane foams and modified with organo-kaolin

2019 ◽  
Vol 56 (4) ◽  
pp. 435-447
Author(s):  
Guojian Wang ◽  
Tao Yang
Keyword(s):  
Compressive Strength ◽  
Polyurethane Foam ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Polyurethane Foams ◽  
Compressive Property ◽  
Rigid Polyurethane Foam ◽  
Open Cell ◽  
Silane Coupling ◽  
Cell Opening

The open cell rigid polyurethane foam (ORPUF) was prepared by adding chemical cell openers including O-500 and AK-9903. The FTIR results of cell openers and open cell rate of ORPUFs showed that O-500 has more effective cell opening capacity. In the ORPUF foaming formulation using O-500 as cell opener, silane coupling agent (KH-550) modified kaolin (organo-kaolin) was introduced into ORPUF with different weight loadings. The cellular morphology, apparent density, and compressive strength of the foams were tested in order to investigate the effects of organo-kaolin on the open cell rate and compressive property of the foams. The results showed that the open cell rate of ORPUFs slightly increased from 83.9% to 92.9% with the content of organo-kaolin. Meanwhile, compared to neat ORPUF, the compressive strength of foams increased by 72.8% when the content of introduced organo-kaolin was 4 parts per hundred of polyol by mass (php).

scholarly journals A Novel Method of Light Weighting Aluminium Using Magnesium Syntactic Composite Core

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 917
Author(s):  
Penchal Reddy Matli ◽  
Joshua Goh Yong Sheng ◽  
Gururaj Parande ◽  
Vyasaraj Manakari ◽  
Beng Wah Chua ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Hybrid Composite ◽  
Compressive Loading ◽  
Core Region ◽  
Core Material ◽  
Novel Method ◽  
Light Weighting ◽  
Melt Deposition ◽  
Shell Region

In this study, hybrid composite consisting of aluminium (Al) shell and magnesium/glass microballoon (Mg-20 wt.% GMB) syntactic composite core was fabricated in a shell-core pattern by combining powder metallurgy and disintegrated melt deposition (DMD) techniques. Physical, microstructural and mechanical properties of as-cast Al and Al/Mg-20GMB hybrid composite were examined. Approximately 13% reduction in density (with respect to aluminium) was realized through the use of a syntactic composite core. Microstructural investigations revealed reasonable interfacial integrity between aluminium shell and Mg-GMB core material and the presence of Al, Mg and GMB phases. The interface region showed a hardness of 109 ± 2 Hv in comparison to the hardness of Al shell region (68 ± 4 Hv) and Mg-20GMB core region (174 ± 5 Hv). In comparison to as-cast Al, the yield strength and ultimate compressive strength of the as-cast Al/Mg-20GMB hybrid composite increased by ~65.4% and ~60%, respectively. Further, the energy absorption under compressive loading for the Al/Mg-20GMB hybrid composite was ~26% higher compared to pure Al. This study validated that Al/Mg-20GMB hybrid composite with superior absolute and specific mechanical properties can be fabricated and used for weight critical applications.

High-toughness polyacrylamide gel containing hydrophobic crosslinking and its double network gel

Polymer ◽  
2016 ◽  
Vol 87 ◽  
pp. 73-80 ◽  
Author(s):  
Jian Chen ◽  
Yinyong Ao ◽  
Tingrui Lin ◽  
Xin Yang ◽  
Jing Peng ◽  
...  
Keyword(s):  
Polyacrylamide Gel ◽  
Double Network ◽  
High Toughness

Facile synthesis of well-defined ABC miktoarm star terpolymers bearing poly(ε-caprolactone), polystyrene and stereoregular helical poly(phenyl isocyanide) blocks

2016 ◽  
Vol 7 (14) ◽  
pp. 2447-2451 ◽  
Author(s):  
Chunhua Liu ◽  
Yan-Xin Mi ◽  
Rong-Hua Wang ◽  
Zhi-Qiang Jiang ◽  
Xiao-Yan Zhang ◽  
...  
Keyword(s):  
Facile Synthesis ◽  
Novel Method ◽  
Miktoarm Star

A novel method for the synthesis of ABC miktoarm star terpolymers bearing poly(ε-caprolactone), polystyrene and helical poly(phenyl isocyanide) blocks has been developed.

Study on Effect of Sintering Temperature on Microstructure and Compressive Property of Porous NiTi Alloys

2011 ◽  
Vol 299-300 ◽  
pp. 480-483 ◽  
Author(s):  
Jing Yuan Yu ◽  
Qiang Li
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Sintering Temperature ◽  
Testing Machine ◽  
Compressive Property ◽  
Powder Metallurgy Method ◽  
Niti Alloys ◽  
Porous Niti ◽  
Universal Testing ◽  
Niti Phase

Porous NiTi alloys were prepared by powder metallurgy method using NH4HCO3as space-holder. The effect of sintering temperature on pore characteristic, phase composition and compressive property of porous NiTi alloys was studied by XRD, SEM, EDS and a universal testing machine. The results show with the increase of sintering temperature the porosity of porous NiTi alloys first increases and then decreases, but the content of NiTi phase, compressive strength and modulous of sintered products continuously increase. When sintered at 980°C for 2h, the porous NiTi alloys have higher porosity of 53.6%, better compressive strength of 173.7MPa and elastic modulous of 4.2GPa. The phases of sinter products are mainly composed by TiNi, Ti2Ni, and TiNi3phases.

scholarly journals Robust bonding and one-step facile synthesis of tough hydrogels with desirable shape by virtue of the double network structure

2011 ◽  
Vol 2 (3) ◽  
pp. 575-580 ◽  
Author(s):  
Junji Saito ◽  
Hidemitsu Furukawa ◽  
Takayuki Kurokawa ◽  
Rikimaru Kuwabara ◽  
Shinya Kuroda ◽  
...  
Keyword(s):  
Network Structure ◽  
Facile Synthesis ◽  
Double Network ◽  
One Step
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