scholarly journals Rice flour-based nanostructures via a water-based system: transformation from powder to electrospun nanofibers under hydrogen-bonding induced viscosity, crystallinity and improved mechanical property

RSC Advances ◽  
2017 ◽  
Vol 7 (32) ◽  
pp. 19960-19966 ◽  
Author(s):  
Sarekha Woranuch ◽  
Autchara Pangon ◽  
Kantapat Puagsuntia ◽  
Nakarin Subjalearndee ◽  
Varol Intasanta
Keyword(s):  
Mechanical Property ◽  
Hydrogen Bonding ◽  
Electrospun Nanofibers ◽  
Rice Flour ◽  
System Transformation ◽  
Biocompatible Material ◽  
Water Based

Rice flour is a naturally abundant and renewable biodegradable and biocompatible material.

scholarly journals Effect of Electrospun Nanofiber Additive on Selected Mechanical Properties of Hardened Cement Paste

2020 ◽  
Vol 10 (21) ◽  
pp. 7504
Author(s):  
Tri N.M. Nguyen ◽  
Do Hyung Lee ◽  
Jung J. Kim
Keyword(s):  
Electron Microscopy ◽  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Electrospun Nanofibers ◽  
Cementitious Materials ◽  
Hardened Cement ◽  
Electrospun Nanofiber ◽  
Nylon 66 ◽  
Hybrid Nanofibers ◽  
Transmission Electron

This study presents an estimation of the mechanical property enhancing mechanism of electrospun-nanofiber-blended cementitious materials. Four types of electrospun nanofibers (NFs) were introduced into Portland cement: nylon 66 nanofibers, tetraethyl orthosilicate/polyvinylpyrrolidone nanofibers (TEOS/PVP), hybrid nanofibers containing carbon nanotubes (CNTs) and nylon 66, and hybrid nanofibers containing carbon nanotubes and TEOS/PVP (CNTs-TEOS/PVP NFs). Due to the mechanical strength results, there was an increase of 27.3% and 33.4% in compressive strength when adding TEOS/PVP nanofibers and the hybrid nanofibers containing carbon nanotubes and TEOS/PVP into the pastes, respectively. In addition, there was an increase of 25.7% and 54.3% in tensile strength when adding nylon 66 nanofibers and the hybrid nanofibers containing carbon nanotubes and nylon 66 into the pastes, respectively. The highest toughness of 61.7% was obtained by the paste blended with CNTs-TEOS/PVP NFs. The results observed from scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis clarified the change in the microstructure of the modified pastes, as well as the mechanical property enhancing mechanism of the electrospun-nanofiber-blended cementitious materials.

Synthesis, Characterization and Dynamic Mechanical Property of PU Elastomers with Cross-Linked Hard Segments

2011 ◽  
Vol 197-198 ◽  
pp. 1205-1212
Author(s):  
Xiao Long Ning ◽  
Qiang Xu ◽  
Gui You Wang
Keyword(s):  
Mechanical Property ◽  
Hydrogen Bonding ◽  
Crosslink Density ◽  
Dynamic Mechanical Property ◽  
Cross Linking ◽  
Curing Agent ◽  
Diphenylmethane Diisocyanate ◽  
Ft Ir ◽  
Hard Segments ◽  
Lower Temperature

A series of cross-linked polyurethane(PU) elastomer samples with various crosslink density were synthesized from polyether diol(PPG2000), 4,4’-diphenylmethane diisocyanate(MDI), 1,4-butanediol(BDO) , trimethylolpropane (TMP) and glycerin. The cross-linking density of the PU elastomers was calculated by Flory–Rehner equation. The degree of hydrogen bonding, the microstructure and the morphologies of these PU materials were characterized by means of FT-IR, DSC and DMA. The experimental results showed that the PU elastomers containing a small amount of crosslink agent ( TMP or glycerin ) may make tanδ to a very low value above the ambient temperature. The PU elastomer samples using glycerin as curing agent can make tanδ to a low value in a lower temperature compared with the ones using TMP as curing agent.

scholarly journals The influence of water-based drilling fluid on mechanical property of shale and the wellbore stability

Petroleum ◽  
2016 ◽  
Vol 2 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Shu He ◽  
Lixi Liang ◽  
Yinjin Zeng ◽  
Yi Ding ◽  
Yongxue Lin ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Drilling Fluid ◽  
Wellbore Stability ◽  
Water Based ◽  
Influence Of Water

scholarly journals A Brief Overview on Preparation of Self-Healing Polymers and Coatings via Hydrogen Bonding Interactions

Macromol ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 18-36
Author(s):  
Ikhlas Gadwal
Keyword(s):  
Mechanical Property ◽  
Hydrogen Bonding ◽  
Service Life ◽  
Review Article ◽  
Main Topic ◽  
Self Healing ◽  
Paint Coating ◽  
Hydrogen Bonding Interactions ◽  
Healing Efficiency

Self-healing coatings or materials have received significant importance in paint, coating, and other industries, as well as in academia, because of their capability to extend materials service life, improving protection, and ensuring sustainability. This review article emphasizes significant advances accomplished in the preparation and properties of intrinsic self-healing materials exclusively based on hydrogen bonding interactions, with possible applications in coatings and adhesives. The main topic of discussion in this review article is the preparation, healing conditions, healing efficiency, and mechanical property recovery after healing. The last part of the review discusses the conclusions and outlook of self-healing materials.

Preparation and Characterization of Antibacterial Electrospun Polyurethane Fibers Containing TiO2-Ag Nanoparticles

2009 ◽  
Vol 79-82 ◽  
pp. 667-670 ◽  
Author(s):  
Su Xia ◽  
Zheng Wang ◽  
Jing Quan Yang ◽  
Li Mei Hao ◽  
Jin Hui Wu
Keyword(s):  
Mechanical Property ◽  
Ag Nanoparticles ◽  
Mixed Mode ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Antibacterial Activities ◽  
Electrospun Fibers ◽  
Physical Form ◽  
Antibacterial Material

A novel antibacterial material was prepared by electrospining polyurethane (PU) containing TiO2-Ag nanoparticles in this study. The average diameter of PU electrospun nanofibers decreased with increasing concentration of TiO2-Ag.These nanofibers membrane showed high antibacterial activities against Staphylococcus aureus and Escherichia coli, respectively. The mixed mode of PU electrospun fibers and TiO2-Ag nanoparticles was a physical form. The addition of TiO2-Ag did not affect the mechanical property of the mat much.

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