scholarly journals Mechanical and Barrier Properties of PVP-Carbon Dot Nanocomposite Films

2019 ◽  
Vol 20 (2) ◽  
pp. 49-56
Author(s):  
Ahmad Sjahriza ◽  
Zainal Alim Mas’ud ◽  
Komar Sutirah
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Citric Acid ◽  
Melting Process ◽  
Barrier Properties ◽  
Single Step ◽  
Nanocomposite Films ◽  
Carbon Dot ◽  
Microwave Process ◽  
Water Vapour Barrier

This research reported carbon dot were synthesized form citric acid and urea through a single step microwave process and Poly Vinyl Pirrolidone (PVP) films composited by carbon dot were prepared. The effects of different composition carbon dots  on mechanical strength of films and water vapour barrier were evaluated. Highest mechanical yielded composite film were analyzed their thermal stability. Average of carbon dot diameter was found 90.61 nm and polydispersity indice 0.396. Different composition carbon dot exhibit significant improvement in tensile strength and modulus. Water permeablity of films varieate with content of carbon dot. The presence of carbon dot had a negligible effect on Tg of film and show melting process.

Preparation and Properties Research of Modified Nano-ZnO/HDPE Composite Films

2010 ◽  
Vol 174 ◽  
pp. 450-453 ◽  
Author(s):  
Ya Na Li ◽  
Kyong Ho Cha ◽  
Qing Hui He
Keyword(s):  
Tensile Strength ◽  
Water Vapor ◽  
Zno Nanoparticles ◽  
Composite Films ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Melt Blending ◽  
Molding Process ◽  
Nano Zno ◽  
Modified Zno Nanoparticles

Nanocomposite films of ZnO/HDPE were prepared via melt blending and hot compression molding process. The morphology, DSC, mechanical and barrier properties of the films were investigated. The results showed that a better dispersion of modified nanoparticles at content of 0.5wt% in HDPE matrix occurred and the improvement of the HDPE films in tensile strength and tear strength was achieved by incorporating modified-ZnO nanoparticles up to 0.5wt% in contrast with the original nano-ZnO/HDPE composite films. It was also found that the addition of modified nano-ZnO to neat HDPE caused to increase crystallinity and enhance the barrier property of nano-ZnO/HDPE composite films against water vapor and oxygen.

scholarly journals Effect of Molecular Weight and Degree of Substitution on the Physical-Chemical Properties of Methylcellulose-Starch Nanocrystal Nanocomposite Films

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3291
Author(s):  
Qian Xiao ◽  
Min Huang ◽  
Xiaolan Zhou ◽  
Miaoqi Dai ◽  
Zhengtao Zhao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
Chemical Properties ◽  
Barrier Properties ◽  
Physicochemical Characteristics ◽  
Degree Of Substitution ◽  
Nanocomposite Films ◽  
Green Method ◽  
Water Vapor Barrier ◽  
Trade Name

This research studied the effect of molecular weight (Mw) and degree of substitution (DS) on the microstructure and physicochemical characteristics of methylcellulose (MC) films with or without SNC. The Mw and DS of three types of commercial MC (trade name of M20, A4C, and A4M, respectively) were in the range of 0.826 to 3.404 × 105 Da and 1.70 to 1.83, respectively. Mw significantly affected the viscosity of methylcellulose solutions as well as the microstructure and tensile strength of methylcellulose films, while DS had a pronounced effect on their oxygen permeability properties. The incorporation of 15% (w/w) SNC resulted in the efficient improvement of tensile strength, water, and oxygen barrier properties of films, particularly for the A4C nanocomposite films. The results from SEM and FTIR illustrated that relatively homogenous dispersion of SNC was distinguished in A4C-15% (w/w) SNC films. Furthermore, microstructures of MC-SNC nanocomposite films were strongly dependent on both Mw and DS of MC. This work offers a convenient and green method to fabricate MC-based nanocomposite films with desirable mechanical, light, oxygen, and water vapor barrier properties.

scholarly journals High oxygen barrier chitosan films neutralized by alkaline nanoparticles

Cellulose ◽  
2021 ◽  
Author(s):  
Urška Jančič ◽  
Mojca Božič ◽  
Silvo Hribernik ◽  
Tamilselvan Mohan ◽  
Rupert Kargl ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photoelectron Spectroscopy ◽  
Film Formation ◽  
Barrier Properties ◽  
Polymer Chains ◽  
Oxygen Barrier ◽  
Casting Method ◽  
X Ray ◽  
Bonding Interaction ◽  
Water Vapour Barrier

AbstractThe most frequent neutralisation procedure, applied on chitosan (CS) films includes treatment with NaOH base. Such treatment endows CS films with stability in water, yet, same can significantly decrease the film performance. In the present paper, we investigate Mg(OH)2 nanoparticles as a neutralisation agent for CS solutions followed by casting into films. This is combined and compared with classical casting and film drying from non-neutralized solutions followed by NaOH treatment after film formation. The influence on the properties of resulting films is investigated in detail and large differences are found for structure and barrier properties. The stable, opaque-to-transparent CS films (depending on Mg(OH)2 content and post-treatment) were obtained by facile casting method of neat CS or CS–Mg(OH)2 dispersions, in the complete absence of cross-linkers and plasticizers. FTIR data demonstrate the Mg(OH)2 and NaOH deprotonation effect, and strongly suggest intensive H-bonding interaction between CS and Mg(OH)2. X-ray photoelectron spectroscopy showed differences in the hydroxide content and protonation of CS nitrogen. The reduction of surface roughness and increase of homogeneity, the tensile strength and elongation, as well as thermal stability and excellent oxygen barrier properties were measured for CS enclosing the Mg(OH)2 nanoparticles. Further treatment with 1 M NaOH causes re-packing of CS polymer chains, improving the crystallinity and water vapour barrier properties, degrading the mechanical properties by increasing the films brittleness and increasing the char formation due to reduced thermal stability. Graphic abstract

scholarly journals Mechanical, Thermal and Electromagnetic Shielding Effectiveness of MWCN-ABS Films

2021 ◽  
Author(s):  
R. B. Jagadeesh Chandra ◽  
B. Shivamurthy ◽  
M. Sathish Kumar ◽  
B. H. S. Thimmappa
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Petri Dish ◽  
Nanocomposite Films ◽  
Heating Process ◽  
Shielding Effectiveness ◽  
X Band ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThe multi-walled carbon nanotubes (MWCNTs) and the poly(acrylonitrile-co-butadiene-co-styrene) (ABS) granulates are dispersed in acetone separately using a magnetic stirrer followed by ultrasonication. Further, both the solutions were mixed with magnetic stirring followed by ultrasonication. Neat-ABS film, 0.25 wt%, 0.5 wt% and 1 wt% of MWCNT-ABS nanocomposite films of the average thickness of 140 µm are fabricated by the solution molding using a petri dish, followed by room temperature curing and further hot compression to maintain uniform thickness. The tensile properties, thermal stability, electrical conductivity, and EMSE of all films are investigated. The results indicate that the addition of MWCNTs to ABS enhanced the mechanical properties and electrical conductivity, thermal stability, and EMSE. The 0.25 wt% MWCNT-ABS nanocomposite films show attractive mechanical, electrical, thermal, and EMSE as compared to neat-ABS films. More than 0.25 wt% MWCNTs in the ABS matrix deteriorates the tensile strength. However, 0.5 wt% MWCNT-ABS nanocomposites exhibit better tensile strength, Young’s modulus, electrical conductivity, and EMSE than neat-ABS. In this research, we used a low quantity of MWCNTs and followed a one-time heating process in the entire fabrication, and produced MWCNT-ABS nanocomposite films with reasonable properties. Hence, this may be one of the options to produce nanocomposites suitable for EMS materials. We recommend that these films may be used as interlayers to develop an X-band range electromagnetic wave shielding material.

scholarly journals The The research to improve the mechanical properties and the water barrier properties of polyvinyl ancol film by graphen oxide

2020 ◽  
Vol 4 (2) ◽  
pp. First
Author(s):  
Nguyen Tuong Vy ◽  
Le Ha Vu Duy
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Young Modulus ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Oxide Material ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Good Thermal Stability ◽  
Modified Hummers Method

In this study, graphene oxide (GO) is synthesized by a modified Hummers method, Polyvinyl alcohol (PVA) films and PVA/ GO nanocomposite films are prepared by casting stable aqueous mixed solutions. X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) showed that there were a good compatibility and dispersion of graphene oxide (GO) on PVA matrix. In addition, nanocomposite films reinforced graphene oxide with the content of only 0.6 % phr have had 10.11% higher tensile strength, 12.24 % greater Young modulus, and significantly reduced water permeability during 4 hours of continuous immersion. Nanocomposite films maintained good thermal stability despite being added with graphene oxide, a material that is considered to have low thermal stability that easily decomposes below 200 oC, so thermal gravimetric analysis diagram (TGA) of PVA/ GO almost did not show a change compared to the neat PVA film. Initial results show that the efficiency of dispersing and reinforcing graphene oxide material on PVA resins has ameliorated the drawbacks of this polymer and contributed to extending the application of PVA in many areas. This has also reached closer to the goal of cleaning the environment by replacing non-biodegradable polymer sources with more friendly polymers.

scholarly journals High Pressure Treatment for Improving Water Vapour Barrier Properties of Poly(lactic acid)/Ag Nanocomposite Films

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1011 ◽  
Author(s):  
Hai Chi ◽  
Jing Xue ◽  
Cheng Zhang ◽  
Haiyan Chen ◽  
Lin Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Vapour ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Poly Lactic Acid ◽  
Pressure Treatment ◽  
Thermal And Mechanical Properties ◽  
High Pressure Treatment ◽  
Film Forming ◽  
Water Vapour Barrier

Effects of high pressure treatment (0, 200 and 400 MPa) on water vapour barrier, microstructure, thermal, and mechanical properties of poly (lactic acid) (PLA)/Ag nanocomposite films were investigated. The migration behavior of nano-Ag from the nanocomposite films in the presence of 50% (v/v) ethanol as a food simulant was also studied. The water vapour barrier properties increased as pressure was applied to film-forming solutions. High pressure treatment enhanced the mutual effect between PLA and nanoparticles, leading to a more compact network structure in PLA/Ag nanocomposite films. Furthermore, PLA/Ag nanocomposite films treated by high pressure were significantly affected by microstructure, thermal, and mechanical properties when, compared with untreated samples. High pressure treatment at 200 to 400 MPa significantly (p < 0.05) reduced the migration of nano-Ag from the films. Overall, high pressure treatment on film-forming solutions showed potential in improving the functional properties of nanocomposite films, especially in relation to water vapour barrier properties.

Effect of Coupling Agent on the Dispersion of PETG Montmorillonite Nanocomposite films.

2003 ◽  
Vol 791 ◽  
Author(s):  
Ajit Ranade ◽  
Nandika D'Souza ◽  
Bruce Gnade ◽  
Christopher Thellen ◽  
Caitlin Orroth ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Food Packaging ◽  
Amorphous Polymer ◽  
High Vacuum ◽  
Layered Silicate ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Scanning Calorimetry ◽  
Nano Technology

ABSTRACTPolyethylene terephthalate glycol (PETG) is a clear amorphous polymer, which is extensively used in flexible packaging. The dual packaging requirements of recyclability and long-term shelf life are often difficult to achieve. Meeting these needs become more urgent when considering food packaging for large volumes of soldiers positioned in different parts of the world. Our approach is to develop a high barrier PET packaging system via the Montmorillonite layered silicate (MLS) based nano technology. Prior research has indicated the significant impact of the polymer crystalline regions on the properties of the resultant nanocomposite. Therefore we must first investigate the amorphous PETG. We must also investigate the influence of increased matrix polarity on dispersion of the PETG by incorporating maleic anhydride (MA) onto the PETG backbone. The influence of the clay concentration and maleation are independently investigated. The glass transition of the as-processed and annealed samples are analyzed using Differential Scanning Calorimetry (DSC) while the thermal stability is determined using Thermogravimetric Analysis (TGA). Testing showed a slight depression in the glass transition temperature of PETG film when the MLS is introduced into the system. The nanocomposite films also demonstrated a lower thermal stability in relation to the neat PETG films. The barrier properties were determined on an in-house built calibration unit based on atomic mobility under high vacuum. X-ray diffraction and TEM were utilized to determine the dispersion of the MLS in PETG. The results indicate that the dispersion was concentration independent but maleation of the PETG led to a slight decrease in agglomeration. An increased ultimate tensile strength and modulus was observed in PETG nanocomposites. The barrier properties were improved by incorporating the MLS into the system. Maleation of the PETG resulted in significant yellowing of the nanocomposites.

scholarly journals Sustainable nanocomposite films based on SiO2 and biodegradable poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) for food packaging

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 072-081
Author(s):  
Yujuan Qiu ◽  
Jirui Fu ◽  
Binqing Sun ◽  
Xiaojun Ma
Keyword(s):  
Thermal Stability ◽  
Migration Rate ◽  
Food Packaging ◽  
Oxygen Permeability ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Solvent Casting ◽  
Nucleating Agents ◽  
Biodegradable Poly ◽  
Thermal Stability Of

Abstract Sustainable nanocomposites with transparent, biodegradable, and enhanced mechanical and barrier properties were prepared by the incorporation of SiO2 into poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) films and subsequent solvent casting. The crystallinity of composites could be increased by 67% with appropriate contents of SiO2, which proved that SiO2 were effective nucleating agents for PHBH. And it was worth mentioning that the contributions of SiO2 to the crystallization and thermal stability of composites are proved effectively by Avrami relationship and Horowitz and Metzger method. More importantly, compared with PHBH, it had not only an enhancement about 40% and 60% on the tensile strength and elastic modulus, respectively, but also half the reduction of the moisture and oxygen permeability which were much higher than the values of conventional plastics. The above, in conjunction with the low migration rate measured in food substitutes, illustrated unambiguously that the nanocomposites might be suitable for potential application in food packaging.

scholarly journals Investigation on the Preparation and Properties of CMC/magadiite Nacre-Like Nanocomposite Films

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1378
Author(s):  
Mingliang Ge ◽  
Yueying Li ◽  
Yinye Yang ◽  
Yanwu Wang ◽  
Guodong Liang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Nanocomposite Film ◽  
Xrd Analysis ◽  
Nanocomposite Films ◽  
Inorganic Filler ◽  
Material Research ◽  
X Ray Diffraction ◽  
Great Probability ◽  
Layer Spacing

The layered hydrated sodium salt-magadiite (MAG), which has special interpenetrating petals structure, was used as a functional filler to slowly self-assemble with sodium carboxy-methylcellulose (CMC), in order to prepare nacre-like nanocomposite film by solvent evaporation method. The structure of prepared nacre-like nanocomposite film was characterized by Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) analysis; whereas, it was indicated that CMC macromolecules were inserted between the layers of MAG to increase the layer spacing of MAG by forming an interpenetrating petals structure; in the meantime, the addition of MAG improved the thermal stability of CMC. The tensile strength of CMC/MAG was significantly improved compared with pure CMC. The tensile strength of CMC/MAG reached the maximum value at 1.71 MPa when the MAG content was 20%, to maintaining high transparency. Due to the high content of inorganic filler, the flame retarding performance and the thermal stability were also brilliant; hence, the great biocompatibility and excellent mechanical properties of the bionic nanocomposite films with the unique interpenetrating petals structure provided a great probability for these original composites to be widely applied in material research, such as tissue engineering in biomedical research.

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