scholarly journals Anisotropic nanocomposite films of hydroxypropylcellulose and graphene oxide with multi-responsiveness

RSC Advances ◽  
2019 ◽  
Vol 9 (49) ◽  
pp. 28876-28885
Author(s):  
Zhimin Ying ◽  
Xiao Ying Lin ◽  
Cong Du ◽  
Si Yu Zheng ◽  
Zi Liang Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Nanocomposite Films ◽  
Sensors And Actuators ◽  
Anisotropic Mechanical Properties ◽  
Potential Applications ◽  
External Stimuli ◽  
Blade Coating

Nanocomposite films fabricated by blade-coating possess anisotropic mechanical properties and multi-responsiveness to external stimuli, affording potential applications as sensors and actuators.

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.

Organophilic graphene nanosheets as a promising nanofiller for bio-based polyurethane nanocomposites: investigation of the thermal, barrier and mechanical properties

2019 ◽  
Vol 43 (39) ◽  
pp. 15659-15672 ◽  
Author(s):  
Mohammed Majdoub ◽  
Younes Essamlali ◽  
Othmane Amadine ◽  
Ikram Ganetri ◽  
Mohamed Zahouily
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Graphene Nanosheets ◽  
Thermoplastic Polyurethane ◽  
Nanocomposite Films ◽  
Thermal Barrier ◽  
Amine Functionalized ◽  
Reduced Graphene ◽  
Polyurethane Nanocomposites ◽  
Long Chain

The present study focuses on the design of new nanocomposite films using bio-based thermoplastic polyurethane (TPU) as a polymer matrix and long chain amine functionalized reduced graphene oxide (G-ODA) as a nanofiller.

A pH and Electric Responsive Graphene Oxide Based Composite Hydrogel

2012 ◽  
Vol 430-432 ◽  
pp. 327-330 ◽  
Author(s):  
Yong Qiang He ◽  
Hua Bin Chen ◽  
Hong Sun ◽  
Xiao Dong Wang ◽  
Jian Ping Gao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Graphene Oxide ◽  
Electric Field ◽  
Structure And Properties ◽  
Composite Hydrogels ◽  
External Stimuli ◽  
Scanning Electron

The pH and electric responsive composite hydrogels were prepared byin situpolymerization in the presence of graphene oxide (GO). Their structure and properties were characterized by scanning electron microscopy, Raman microscopy and mechanical testing. The results indicate that the GO is evenly dispersed in the composite hydrogels and the mechanical properties of the GO based composite hydrogels are significantly improved. Most importantly, the composite hydrogels were responsive to external stimuli such as pH and electric field.

Effects of the molecular level dispersion of graphene oxide on the free volume characteristics of poly(vinyl alcohol) and its impact on the thermal and mechanical properties of their nanocomposites

2015 ◽  
Vol 17 (43) ◽  
pp. 29201-29209 ◽  
Author(s):  
S. K. Sharma ◽  
J. Prakash ◽  
P. K. Pujari
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Molecular Level ◽  
Amorphous Region ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
Thermal And Mechanical Properties ◽  
Molecular Dispersion ◽  
Volume Characteristics

The effects of the molecular dispersion of graphene oxide on (A) the crystallinity of PVA–GO nanocomposite films and (B) nanohole size distribution in the amorphous region of PVA–GO nanocomposite films.

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