Novel environmentally friendly waterborne polyurethane/hollow Ni0.3Zn0.5Fe2O4 nanocomposite films: superior magnetic and mechanical properties

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75440-75448 ◽  
Author(s):  
Suli Chen ◽  
Tao Jin ◽  
Wenling Wu ◽  
Guanghui Zhao
Keyword(s):  
Mechanical Properties ◽  
Environmentally Friendly ◽  
Waterborne Polyurethane ◽  
Nanocomposite Films

Superparamagnetic nanocomposite films based on waterborne polyurethane and hollow Ni0.3Zn0.5Fe2O4 nanospheres (WPU/h-NZFO) were synthesized via an in situ polymerization technique.

Preparation and Property of Waterborne Polyurethane/Cellulose Nanofiber Nanocomposite Films

2020 ◽  
Vol 993 ◽  
pp. 631-637
Author(s):  
Yu Zhe Lin ◽  
Jia Min Zeng ◽  
Jing Hong Ma ◽  
Jing Hua Gong
Keyword(s):  
Mechanical Properties ◽  
Cellulose Nanofibers ◽  
Waterborne Polyurethane ◽  
Tensile Tests ◽  
Environmental Safety ◽  
Nanocomposite Films ◽  
Solution Blending ◽  
Low Weight ◽  
New Type ◽  
Dispersing Medium

Waterborne polyurethane (WPU) is a new type of polyurethane system, which using water instead of organic solvent as dispersing medium. Because of its non-toxicity and environmental safety, WPU is considered as the development direction of coatings and adhesives. However, the mechanical properties of WPU are worse than that of solvent-based polyurethane, therefore, the modification of WPU has received increasingly attention. Meanwhile numerous evidences demonstrate the excellent properties of cellulose nanofibers (CNFs) such as high aspect ratio, low weight and outstanding mechanical strength. Therefore, there is a high expectation for CNFs to be introduced into WPU as reinforcing filler. In this work, a series of CNFs/WPU nanocomposite films were prepared by solution blending. The structure, morphology, thermal behavior and mechanical properties were investigated. SEM results showed that CNFs were evenly dispersed in the WPU matrix. Tensile tests indicated that the modulus and tensile strength of CNFs/WPU nanocomposite films were improved compared with the neat film. While the break elongation of the nanocomposite films decreased with the increase of CNFs content. The synergistic interaction between CNFs and WPU matrix plays an important role in the enhancement of mechanical properties.

scholarly journals Achieving Secondary Dispersion of Modified Nanoparticles by Hot-Stretching to Enhance Dielectric and Mechanical Properties of Polyarylene Ether Nitrile Composites

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 1006 ◽  
Author(s):  
Yong You ◽  
Ling Tu ◽  
Yajie Wang ◽  
Lifen Tong ◽  
Renbo Wei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Temperature Stability ◽  
Nanocomposite Films ◽  
Dielectric Films ◽  
New Approach ◽  
Polyarylene Ether Nitrile ◽  
Transmission Electron ◽  
Dielectric Performance ◽  
Dielectric And Mechanical Properties

Enhanced dielectric and mechanical properties of polyarylene ether nitrile (PEN) are obtained through secondary dispersion of polyaniline functionalized barium titanate (PANI-f-BT) by hot-stretching. PANI-f-BT nanoparticles with different PANI content are successfully prepared via in-situ aniline polymerization technology. The transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopic instrument (XPS) and Thermogravimetric analysis (TGA) results confirm that the PANI layers uniformly enclose on the surface of BaTiO3 nanoparticles. These nanoparticles are used as functional fillers to compound with PEN (PEN/PANI-f-BT) for studying its effect on the mechanical and dielectric performance of the obtained composites. In addition, the nanocomposites are uniaxial hot-stretched by 50% and 100% at 280 °C to obtain the oriented nanocomposite films. The results exhibit that the PANI-f-BT nanoparticles present good compatibility and dispersion in the PEN matrix, and the hot-stretching endows the second dispersion of PANI-f-BT in PEN resulting in enhanced mechanical properties, crystallinity and permittivity-temperature stability of the nanocomposites. The excellent performances of the nanocomposites indicate that a new approach for preparing high-temperature-resistant dielectric films is provided.

Synthesis and properties of a nano-silica modified environmentally friendly polyurethane adhesive

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 44990-44997 ◽  
Author(s):  
Guo Jia-Hu ◽  
Liu Yu-Cun ◽  
Chai Tao ◽  
Jing Su-Ming ◽  
Ma Hui ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Waterborne Polyurethane ◽  
Nano Silica ◽  
Polyurethane Adhesive ◽  
High Adhesion ◽  
Adhesion Performance

In this study, a nano-SiO2 modified waterborne polyurethane (WPU) adhesive with remarkably low VOC content and high adhesion performance was successfully synthesized via in situ polymerization.

scholarly journals Preparation and characterization of graphene oxide and cellulose nanofibers/ polyvinyl alcohol nanocomposite film

2021 ◽  
Vol 5 (3) ◽  
pp. first
Author(s):  
Nguyen Tuong Vy ◽  
Nguyen Thi Khoi Pham ◽  
Lam Quoc Ha
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Moisture Absorption ◽  
Cold Water ◽  
Cellulose Nanofibers ◽  
Environmentally Friendly ◽  
Nanocomposite Films ◽  
Cnf Films

Polyvinyl alcohol (PVA) is well-known in the packaging industry, especially in the food and medical fields with the ability to be completely biodegradable and easily soluble in cold water therefore products made from it are the environmentally friendly materials. However, the disadvantages of this polymer as quick dissolubility in water, poor moisture retention, weak mechanical properties reduce its applications. In this study, PVA, reinforced by “green” components at the nanometer-level such as nanocellulose fibers (CNF), graphene oxide (GO) nanosheets showed improvements in properties. Mechanical properties of all of nanocomposite films showed improvements in stress at break and modulus. Especially, reinforced GO and CNF films increased almost doubled and improved more 40% in modulus than the pure PVA film and films reinforced by only GO or CNF. When immersed in water (neutral pH) at room temperature, graphene oxide-reinforced films not only had effective improvements in swelling time but also supported to decrease water retension of film added CNF. The combined reinforcement also indicated a benefit in reducing the rate of water vapor loss of the film as well as the efficiency in declining the moisture absorption of the nanocomposite films. The PVA films reinforced by nanocellulose fibers and graphene oxide sheets overcomed some of the PVA's shortcomings. This helped expanding its applications in the field of environmentally friendly nanocomposite films.

Synthesis and properties of novel UV – curable hyperbranched waterborne polyurethane/Fe3O4 nanocomposite films with excellent magnetic properties

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4355-4363 ◽  
Author(s):  
Suli Chen ◽  
Sidi Zhang ◽  
Yanfeng Li ◽  
Guanghui Zhao
Keyword(s):  
Magnetic Properties ◽  
Microwave Absorption ◽  
Waterborne Polyurethane ◽  
Nanocomposite Films ◽  
Uv Curable ◽  
Promising Application ◽  
Polymerization Method ◽  
Absorption Field

A novel magnetic WPU/Fe3O4 nanocomposite has been successfully synthesized by in situ polymerization method. The nanocomposite films present excellent magnetic properties, which would have a promising application in microwave-absorption field.

Dynamics of Nanoparticle Chain Aggregates of Carbon Under Tension

2003 ◽  
Vol 778 ◽  
Author(s):  
Rajdip Bandyopadhyaya ◽  
Weizhi Rong ◽  
Yong J. Suh ◽  
Sheldon K. Friedlander
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Polymer Film ◽  
Elastic Behavior ◽  
Small Strains ◽  
Transmission Electron ◽  
Chain Aggregates ◽  
Nanoparticle Chains ◽  
Reinforcing Filler

AbstractCarbon black in the form of nanoparticle chains is used as a reinforcing filler in elastomers. However, the dynamics of the filler particles under tension and their role in the improvement of the mechanical properties of rubber are not well understood. We have studied experimentally the dynamics of isolated nanoparticle chain aggregates (NCAs) of carbon made by laser ablation, and also that of carbon black embedded in a polymer film. In situ studies of stretching and contraction of such chains in the transmission electron microscope (TEM) were conducted under different maximum values of strain. Stretching causes initially folded NCA to reorganize into a straight, taut configuration. Further stretching leads to either plastic deformation and breakage (at 37.4% strain) or to a partial elastic behavior of the chain at small strains (e.g. 2.3% strain). For all cases the chains were very flexible under tension. Similar reorientation and stretching was observed for carbon black chains embedded in a polymer film. Such flexible and elastic nature of NCAs point towards a possible mechanism of reinforcement of rubber by carbon black fillers.

Sign in / Sign up

Export Citation Format

Share Document