Mechanical properties of wood swollen in organic liquids with two or more functional groups for hydrogen bonding in a molecule

2001 ◽  
Vol 47 (3) ◽  
pp. 171-177 ◽  
Author(s):  
Yutaka Ishimaru ◽  
Sigehiro Narimoto ◽  
Ikuho Iida
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Functional Groups ◽  
Organic Liquids

scholarly journals Mechanical Properties of Graphene Oxide Coupled by Multi-Physical Field: Grain Boundaries and Functional Groups

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 62
Author(s):  
Xu Xu ◽  
Zeping Zhang ◽  
Wenjuan Yao
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Grain Boundaries ◽  
Functional Groups ◽  
Oxygen Content ◽  
Tensile Fracture ◽  
Hydroxyl Groups ◽  
Molecular Configuration ◽  
Spatial Design ◽  
Out Of Plane

Graphene and graphene oxide (GO) usually have grain boundaries (GBs) in the process of synthesis and preparation. Here, we “attach” GBs into GO, a new molecular configuration i.e., polycrystalline graphene oxide (PGO) is proposed. This paper aims to provide an insight into the stability and mechanical properties of PGO by using the molecular dynamics method. For this purpose, the “bottom-up” multi-structure-spatial design performance of PGO and the physical mechanism associated with the spatial structure in mixed dimensions (combination of sp2 and sp3) were studied. Also, the effect of defect coupling (GBs and functional groups) on the mechanical properties was revealed. Our results demonstrate that the existence of the GBs reduces the mechanical properties of PGO and show an “induction” role during the tensile fracture process. The presence of functional groups converts in-plane sp2 carbon atoms into out-of-plane sp3 hybrid carbons, causing uneven stress distribution. Moreover, the mechanical characteristics of PGO are very sensitive to the oxygen content of functional groups, which decrease with the increase of oxygen content. The weakening degree of epoxy groups is slightly greater than that of hydroxyl groups. Finally, we find that the mechanical properties of PGO will fall to the lowest values due to the defect coupling amplification mechanism when the functional groups are distributed at GBs.

scholarly journals The crystal structures and mechanical properties of the uranyl carbonate minerals roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite

2020 ◽  
Vol 7 (21) ◽  
pp. 4197-4221 ◽  
Author(s):  
Francisco Colmenero ◽  
Jakub Plášil ◽  
Jiří Sejkora
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Diffraction Pattern ◽  
Crystal Structures ◽  
First Principles ◽  
X Ray Diffraction ◽  
Carbonate Minerals ◽  
X Ray ◽  
Uranyl Carbonate

The structure, hydrogen bonding, X-ray diffraction pattern and mechanical properties of six important uranyl carbonate minerals, roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite, are determined using first principles methods.

Carbohydrate based hyper-crosslinked organic polymers with –OH functional groups for CO2 separation

2015 ◽  
Vol 3 (42) ◽  
pp. 20913-20918 ◽  
Author(s):  
Haiying Li ◽  
Bo Meng ◽  
Shannon M. Mahurin ◽  
Song-Hai Chai ◽  
Kimberly M. Nelson ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Functional Groups ◽  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Co2 Separation ◽  
Organic Polymers ◽  
Microporous Polymers ◽  
Quadrupole Interactions ◽  
And Storage

A class of novel hyper-crosslinked microporous polymers, based on green and renewable carbohydrates, was synthesized for carbon capture and storage with high CO2/N2 selectivity by hydrogen bonding and dipole–quadrupole interactions.

Novel Polyaspartic Ester Polyureas Based on Flexible Polyaspartic Ester

2011 ◽  
Vol 197-198 ◽  
pp. 1294-1298
Author(s):  
Ping Lu ◽  
Wei Bo Huang ◽  
Xue Qiang Ma ◽  
Xu Dong Liu
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Hydrogen Bonding ◽  
Molecular Weight Distribution ◽  
Michael Addition ◽  
Weight Distribution ◽  
Addition Reaction ◽  
Chain Extender ◽  
Michael Addition Reaction ◽  
Ft Ir

New polyaspartic ester (PAE) chain extender named PAE-f was prepared via two steps of Michael addition reactions:(1) Michael addition reaction between 4,4’-methylenebis(2-methyl cyclohexyl amine) (Laromin C260) and excessive dialkyl maleates（DEF）; (2) The Michael addition reaction of the residual dialkyl maleates of step (1) with polyester polyamine Jeffamine D230. The two-steps method proposed could reduce the reaction time in comparison with the current one step Michael addition reaction method, thus satisfying the industrialized production. New PAE based polyureas were synthesized by reacting the PAE-f chain extender with aliphatic polyisocyanates 4,4’-diisocyanato dicyclohexylmethane (H12MDI) / polyester polyamine Jeffamine D2000 prepolymer at room temperature. FT-IR and GPC were employed to characterize the new PAE prepared, and the morphology, molecular weight distribution and mechanical properties of the prepared PAE based polyureas were investigated by means of FT-IR and GPC. The FT-IR results indicated that the hydrogen bonding degree of amidogen groups in hard segments of the prepared polyureas were high, the length of hydrogen bonding were 0.305nm～0.306nm. The GPC experimental results show that the weight average molecular weight of the PAE-f based polyureas were 4.95×104～6.05×104,Mw/Mn were 1.65～1.97, the molecular weight distribution were relatively narrow. The mechanical properties demonstrated that the tensile strength were 14.7～22.5MPa, Elongation at break were 306～511%, Yang’s modulus were 67～127MPa, Shore A hardness were 64～83. The mechanical properties confirmed that the polyureas based on PAE-f were kinds of elastomeric materials with satisfied flexibility, strength, module and hardness.

Computational and Experimental Study of Phenolic Resins: Thermal–Mechanical Properties and the Role of Hydrogen Bonding

2015 ◽  
Vol 48 (20) ◽  
pp. 7670-7680 ◽  
Author(s):  
Joshua D. Monk ◽  
Eric W. Bucholz ◽  
Tane Boghozian ◽  
Shantanu Deshpande ◽  
Jay Schieber ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Hydrogen Bonding ◽  
Phenolic Resins ◽  
Thermal Mechanical Properties

Two-dimensional coordination polymers and metal–organic gels of symmetrical and unsymmetrical dipyridyl β-diketones: luminescence, dye absorption and mechanical properties

2016 ◽  
Vol 40 (3) ◽  
pp. 1997-2006 ◽  
Author(s):  
Kaustuv Banerjee ◽  
Kumar Biradha
Keyword(s):  
Mechanical Properties ◽  
Functional Groups ◽  
Coordination Polymers ◽  
Two Dimensional ◽  
Dye Absorption ◽  
Metal Organic

The ligands containing chelating as well as exodentate functional groups were shown to form functional coordination polymers and heterometallic gels.

scholarly journals RESEARCH OF INFLUENCE OF CROSS-LINKING AGENTS ON CHARACTERISTICS OF SPATIAL GRID AND PROPERTIES OF URETHANE POLYMER

2018 ◽  
Vol 59 (7) ◽  
pp. 86
Author(s):  
Inna Slepchuk ◽  
Olga Ya. Semeshko ◽  
Yuliya G. Saribekova ◽  
Irina N. Kulish ◽  
Igor V. Gorokhov
Keyword(s):  
Mechanical Properties ◽  
Functional Groups ◽  
Organic Solvents ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Polymeric Films ◽  
Cross Linking ◽  
Glycidyl Ethers ◽  
Equilibrium Swelling ◽  
Spatial Grid

Results of study of influence of amount of functional groups of glycidyl ethers on characteristics of the spatial grid of crosslinked polyurethane polymer are presented. Parameters of a three-dimensional spatial grid of investigated samples of polymeric films and their physical and mechanical properties were determined by a method of equilibrium swelling in organic solvents.

Design for dynamic hydrogen bonding in a double network structure to improve the mechanical properties of sodium alginate fibers

2021 ◽  
Author(s):  
Ming Yan ◽  
Junfeng Shi ◽  
Song Tang ◽  
Guohang Zhou ◽  
Jiexiang Zeng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Sodium Alginate ◽  
Network Structure ◽  
Wet Spinning ◽  
Double Network ◽  
Alginate Fibers

The SA/PAA-VSNP fiber was obtained using dynamic wet spinning through dynamic hydrogen bonding in the double network structure.

Sign in / Sign up

Export Citation Format

Share Document