Graphene Oxide Papers Modified by Divalent Ions—Enhancing Mechanical Properties via Chemical Cross-Linking

ACS Nano ◽  
2008 ◽  
Vol 2 (3) ◽  
pp. 572-578 ◽  
Author(s):  
Sungjin Park ◽  
Kyoung-Seok Lee ◽  
Gulay Bozoklu ◽  
Weiwei Cai ◽  
SonBinh T. Nguyen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Cross Linking ◽  
Divalent Ions ◽  
Chemical Cross Linking

scholarly journals Hyperbranched polyamide modified graphene oxide-reinforced polyurethane nanocomposites with enhanced mechanical properties

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14484-14494
Author(s):  
Yahao Liu ◽  
Jian Zheng ◽  
Xiao Zhang ◽  
Yongqiang Du ◽  
Guibo Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
High Performance ◽  
Cross Linking ◽  
Elongation At Break ◽  
Modified Graphene Oxide ◽  
High Performance Composite ◽  
Modified Graphene ◽  
Polyurethane Nanocomposites ◽  
Hyperbranched Polyamide

We successfully modified graphene oxide with amino-terminated hyperbranched polyamide (HGO), and obtained a high-performance composite with enhanced strength and elongation at break via cross-linking hydroxyl-terminated polybutadiene chains with HGO.

Internal Composition versus the Mechanical Properties of Polyelectrolyte Multilayer Films: The Influence of Chemical Cross-Linking†

Langmuir ◽  
2009 ◽  
Vol 25 (24) ◽  
pp. 13809-13819 ◽  
Author(s):  
Thomas Boudou ◽  
Thomas Crouzier ◽  
Rachel Auzély-Velty ◽  
Karine Glinel ◽  
Catherine Picart
Keyword(s):  
Mechanical Properties ◽  
Multilayer Films ◽  
Cross Linking ◽  
Polyelectrolyte Multilayer ◽  
Chemical Cross Linking

scholarly journals Analysis of the Effect of Processing Conditions on Physical Properties of Thermally Set Cellulose Hydrogels

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1066 ◽  
Author(s):  
Tim Huber ◽  
Sean Feast ◽  
Simone Dimartino ◽  
Wanwen Cen ◽  
Conan Fee
Keyword(s):  
Mechanical Properties ◽  
Network Formation ◽  
Aqueous Sodium Hydroxide ◽  
Cross Linking ◽  
Processing Conditions ◽  
Hot Press ◽  
Thermal Gelation ◽  
Complex Shapes ◽  
Bond Network ◽  
Chemical Cross Linking

Cellulose-based hydrogels were prepared by dissolving cellulose in aqueous sodium hydroxide (NaOH)/urea solutions and casting it into complex shapes by the use of sacrificial templates followed by thermal gelation of the solution. Both the gelling temperatures used (40–80 °C), as well as the method of heating by either induction in the form of a water bath and hot press or radiation by microwaves could be shown to have a significant effect on the compressive strength and modulus of the prepared hydrogels. Lower gelling temperatures and shorter heating times were found to result in stronger and stiffer gels. Both the effect of physical cross-linking via the introduction of additional non-dissolving cellulosic material, as well as chemical cross-linking by the introduction of epichlorohydrin (ECH), and a combination of both applied during the gelation process could be shown to affect both the mechanical properties and microstructure of the hydrogels. The added cellulose acts as a physical-cross-linking agent strengthening the hydrogen-bond network as well as a reinforcing phase improving the mechanical properties. However, chemical cross-linking of an unreinforced gel leads to unfavourable bonding and cellulose network formation, resulting in drastically increased pore sizes and reduced mechanical properties. In both cases, chemical cross-linking leads to larger internal pores.

Chemical Cross-Linking of Anatase Nanoparticle Thin Films for Enhanced Mechanical Properties

Langmuir ◽  
2018 ◽  
Vol 34 (21) ◽  
pp. 6109-6116 ◽  
Author(s):  
A. Salmatonidis ◽  
J. Hesselbach ◽  
G. Lilienkamp ◽  
T. Graumann ◽  
W. Daum ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Cross Linking ◽  
Chemical Cross Linking

scholarly journals Mechanically Reinforced Gelatin Hydrogels by Introducing Slidable Supramolecular Cross-Linkers

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1787 ◽  
Author(s):  
Dae Hoon Lee ◽  
Atsushi Tamura ◽  
Yoshinori Arisaka ◽  
Ji-Hun Seo ◽  
Nobuhiko Yui
Keyword(s):  
Mechanical Properties ◽  
Stress Concentration ◽  
Cross Linking ◽  
Supramolecular Polymer ◽  
Poly Ethylene Glycol ◽  
Physical Force ◽  
Adhesive Material ◽  
Cell Adhesive ◽  
Poly Ethylene ◽  
Chemical Cross Linking

Tough mechanical properties are generally required for tissue substitutes used in regeneration of damaged tissue, as these substitutes must be able to withstand the external physical force caused by stretching. Gelatin, a biopolymer derived from collagen, is a biocompatible and cell adhesive material, and is thus widely utilized as a component of biomaterials. However, the application of gelatin hydrogels as a tissue substitute is limited owing to their insufficient mechanical properties. Chemical cross-linking is a promising method to improve the mechanical properties of hydrogels. We examined the potential of the chemical cross-linking of gelatin hydrogels with carboxy-group-modified polyrotaxanes (PRXs), a supramolecular polymer comprising a poly(ethylene glycol) chain threaded into the cavity of α-cyclodextrins (α-CDs), to improve mechanical properties such as stretchability and toughness. Cross-linking gelatin hydrogels with threading α-CDs in PRXs could allow for freely mobile cross-linking points to potentially improve the mechanical properties. Indeed, the stretchability and toughness of gelatin hydrogels cross-linked with PRXs were slightly higher than those of the hydrogels with the conventional chemical cross-linkers 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC)/N-hydroxysuccinimide (NHS). In addition, the hysteresis loss of gelatin hydrogels cross-linked with PRXs after repeated stretching and relaxation cycles in a hydrated state was remarkably improved in comparison with that of conventional cross-linked hydrogels. It is considered that the freely mobile cross-linking points of gelatin hydrogels cross-linked with PRXs attenuates the stress concentration. Accordingly, gelatin hydrogels cross-linked with PRXs would provide excellent mechanical properties as biocompatible tissue substitutes exposed to a continuous external physical force.

Borate cross-linking chitosan/graphene oxide films: Toward the simultaneous enhancement of gases barrier and mechanical properties

2015 ◽  
Author(s):  
Ning Yan ◽  
Filomena Capezzuto ◽  
Giovanna G. Buonocore ◽  
Fabiana Tescione ◽  
Marino Lavorgna ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Oxide Films ◽  
Cross Linking
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