Nano SiO2/Cellulose Composite Films Prepared via Ionic Liquids

2013 ◽  
Vol 791-793 ◽  
pp. 398-401
Author(s):  
Bing Jie Li ◽  
Zhao Mei Wang ◽  
Kai Jun Xiao ◽  
Yang Liu
Keyword(s):  
Ionic Liquids ◽  
Water Flux ◽  
Composite Films ◽  
Decomposition Temperature ◽  
Cellulose Film ◽  
Elongation At Break ◽  
Good Thermal Stability ◽  
Prepared Composite ◽  
Cellulose Composite ◽  
Scanning Electron

nanoSiO2/cellulose composite films were prepared via ionic liquids 1-ethyl-3-methylimidazolium acetate (EMIMAc) solution containing cotton pulp cellulose. The as-prepared composite films were characterized by means of scanning electron microscope (SEM) and thermogravimetric analysis (TGA). It was indicated that the surface structure of obtained films was dense and compact, which was composed of nanoSiO2particles. The modified nanoSiO2composite film showed a good thermal stability with decomposition temperature up to 692°C when the weight residue of the film was 50%. The tensile strength and elongation at break increased by 50% and 35% than that of original cellulose film without SiO2. The film containing 0.5% SiO2showed a water flux of 249.8L.m2.h-1and the retention of BSA by 97%.

Thermal and Mechanical Properties of Corn Stalk Microcrystalline Cellulose Reinforced PLA Composites

2011 ◽  
Vol 233-235 ◽  
pp. 1726-1729
Author(s):  
Chun Guang Li ◽  
Rui Zhang ◽  
Yun Xia Li ◽  
Peng Fei Xu ◽  
Yan Qiu Wang
Keyword(s):  
Thermal Properties ◽  
Tensile Properties ◽  
Microcrystalline Cellulose ◽  
Composite Films ◽  
Decomposition Temperature ◽  
Corn Stalk ◽  
Thermal And Mechanical Properties ◽  
Initial Decomposition Temperature ◽  
Elongation At Break ◽  
Biodegradable Composite

The biodegradable composite films were prepared from corn stalk microcrystalline cellulose as filler and polylactic acid (PLA) as polymeric matrix. The crystallinity, the tensile properties and the thermal properties of the composites were tested. The results show that the tensile properties and thermal properties were improved with the addition of corn stalk microcrystalline cellulose. When corn stalk microcrystalline cellulose account for 10% of the PLA quality, the initial decomposition temperature was raised by 34.38, tensile strength increased by 58.3% and elongation at break increased by 31.1% compared to those of pure PLA.

Low-Temperature Thermocatalytic Degradation of Polyethene Films by Nano-Titanium Dioxide in Water

2014 ◽  
Vol 804 ◽  
pp. 47-50
Author(s):  
Ke Li ◽  
Xue Gang Luo ◽  
Mian Wang ◽  
Fang Wei Qi ◽  
Pei Wu ◽  
...  
Keyword(s):  
Small Molecules ◽  
Low Temperatures ◽  
Composite Films ◽  
Decomposition Temperature ◽  
Degradation Behavior ◽  
Melt Blending ◽  
Ft Ir ◽  
Branched Chains ◽  
Nano Titanium Dioxide ◽  
Scanning Electron

nanoTiO2powders were utilized as thermocatalyst for catalytic degradation of polyethylene in water. LDPE/TiO2composite films were prepared by the method of melt blending. The aging experiments were conducted in ovens under temperatures of 30 °C, 40 °C and 50 °C, respectively. The thermocatalytic degradation behavior towards the composite films was characterized by fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG) and scanning electron microscopy (SEM). Results show that both pure LDPE films and LDPE /TiO2composite films can be degraded even under low temperatures in water. After thermal degradation for 90 days at 50 °C, the composite film with 2wt% nanoTiO2was oxidized the most acutely: the quantity of branched chains decreased to some extent and lots of small molecules were detected, the decomposition temperature was also reduced by 28.2 °C. Besides, the surface of the films became rougher than that of the film before degradation.

Characteristics of HPMC/Beeswax Edible Composite Film and its Application for Preservation of Seedless Lime Fruit

2020 ◽  
Vol 850 ◽  
pp. 87-93
Author(s):  
Thi Luong Nguyen ◽  
Hoc Thang Nguyen ◽  
Van Khoi Nguyen ◽  
Thi Thu Ha Pham ◽  
Thi Hong Thuy Le ◽  
...  
Keyword(s):  
Weight Loss ◽  
Tensile Strength ◽  
Composite Film ◽  
Composite Films ◽  
Analytical Techniques ◽  
Total Acid ◽  
Elongation At Break ◽  
Thermogravimetric Analyzer ◽  
Before And After ◽  
Scanning Electron

This article is aimed at evaluating newly synthesized HPMC/BW composite films, applied for preservation of seedless lime fruit. Factors influenced to formation of the films as well as characteristics of HPMC/BW edible composite films were researched and analyzed based on experimental results and previous studies. The HPMC/BW edible composite films were created based on the components included HPMC (5% w/v), Glycerol plasticizer (Gly-2% v/v), BW (5% w/v); Oleic Acid emulsifier (OA-1% v/v). Characteristics of the composite film were evaluated via the analytical techniques known as Sensory, Tensile Strength (TS), Elongation at Break (EB), ThermoGravimetric Analyzer (TGA), Scanning Electron Microscope (SEM), Fourier Transform InfraRed (FTIR). HPMC/BW composite films applied in preserving seedless limes. Evaluations of preservation processes were based on effects of characteristics such as Sensory evaluation, Respiratory intensity, Weight loss, Vitamin C content, Total acid of before and after fruits preservation.

Facile Preparation of Chitin/Cellulose Composite Films Using Ionic Liquids

2011 ◽  
Vol 20 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Jun-ichi Kadokawa ◽  
Kanako Hirohama ◽  
Shozaburo Mine ◽  
Takeshi Kato ◽  
Kazuya Yamamoto
Keyword(s):  
Ionic Liquids ◽  
Composite Films ◽  
Facile Preparation ◽  
Cellulose Composite

Properties of All-Cellulose Composite Films from Coconut Shell Powder and Microcrystalline Cellulose

2015 ◽  
Vol 754-755 ◽  
pp. 39-43 ◽  
Author(s):  
H. Farah Norain ◽  
Husseinsyah Salmah ◽  
M. Mostapha Zakaria
Keyword(s):  
Microcrystalline Cellulose ◽  
Composite Films ◽  
Selective Dissolution ◽  
Coconut Shell ◽  
Lignocellulosic Material ◽  
Elongation At Break ◽  
Cellulose Composites ◽  
Coconut Shell Powder ◽  
Cellulose Composite ◽  
Shell Powder

All-cellulose composite using coconut shell powders (CSP) as natural lignocellulosic material and microcrystalline cellulose (MCC) were prepared by a surface selective dissolution. The effect of CSP content on tensile properties and crystallinity of CSP/MCC all-cellulose composites were investigated. It was found that the addition of CSP have increased the tensile strength and modulus of elasticity up to 3 wt% and decreased with further increment of CSP content. The elongation at break decreased with CSP content. The crystallinity of cellulose composites increased with the increasing of CSP content.

Thermal and Mechanical Properties of Bagasse Microcrystalline Cellulose Reinforced PLA Composites

2011 ◽  
Vol 284-286 ◽  
pp. 1786-1789
Author(s):  
Chun Guang Li ◽  
Wei Gong Peng ◽  
Yun Xia Li ◽  
Peng Fei Xu ◽  
Wei Tian ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Tensile Properties ◽  
Microcrystalline Cellulose ◽  
Mass Fraction ◽  
Composite Films ◽  
Decomposition Temperature ◽  
Thermal And Mechanical Properties ◽  
Initial Decomposition Temperature ◽  
Elongation At Break ◽  
Biodegradable Composite

The biodegradable composite films were prepared from bagasse microcrystalline cellulose as filler and polylactic acid (PLA) as polymeric matrix. The crystallinity, the tensile properties and the thermal properties of the composites were tested. The results show that the tensile properties and thermal properties were improved with the addition of bagasse microcrystalline cellulose. When bagasse microcrystalline cellulose mass fraction was 5%, the initial decomposition temperature was raised by 30.73°C, and the tensile strength increased by 50.98%, and the elongation at break increased by 16.25% compared to those of pure PLA.

Effects of Plasticizers on Mechanical Properties, Oxygen Permeability, and Microstructural Characteristics of HPMC/Beeswax Composite Film

2021 ◽  
Vol 32 ◽  
pp. 25-34
Author(s):  
Thi Luong Nguyen ◽  
Pham Khanh Van Nguyen ◽  
Hoc Thang Nguyen ◽  
Van Khoi Nguyen ◽  
Thi Thu Ha Pham ◽  
...  
Keyword(s):  
Oxygen Permeability ◽  
Polymer Networks ◽  
Composite Films ◽  
Methyl Cellulose ◽  
Microstructural Characteristics ◽  
Polyethylene Glycol 400 ◽  
Elongation At Break ◽  
Peg 400 ◽  
Control Film ◽  
Scanning Electron

The ability to plasticize Hydroxypropyl Methyl Cellulose/Beeswax (HPMC/BW) composites depends on plasticizers and their concentration. This paper conducted studying on the impacts of plasticizers to HPMC/BW properties. The plasticizers were used in this research included Glycerol (G), Propylene Glycol (PG), and Polyethylene Glycol 400 (PEG 400) which had the concentration changed in range of 1-3%. HPMC/BW composite films incorporated with 2% of plasticizers formed films with the best characteristics among three tested concentration. Tensile strength and elastic modulus of films were decreased when adding plasticizers, whereas elongation at break were increased. Therefore, it caused an increase in oxygen permeability of HPMC/BW films in comparison with the control film. However, Glycerol showed the lowest Oxygen Permeability (OP) values compared to other composite films. The films were evaluated its microstructural quality using method of scanning electron microscopy (SEM) which had the effects of plasticizers and their efficiencies of plasticizing polymer networks.

scholarly journals An Effective Method for Preparation of Liquid Phosphoric Anhydride and Its Application in Flame Retardant Epoxy Resin

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2205
Author(s):  
Qian Li ◽  
Yujie Li ◽  
Yifan Chen ◽  
Qiang Wu ◽  
Siqun Wang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Oxygen Index ◽  
Decomposition Temperature ◽  
Ease Of Use ◽  
Limiting Oxygen Index ◽  
Good Thermal Stability ◽  
Low Viscosity ◽  
The Impact

A novel liquid phosphorous-containing flame retardant anhydride (LPFA) with low viscosity was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and methyl tetrahydrophthalic anhydride (MeTHPA) and further cured with bisphenol-A epoxy resin E-51 for the preparation of the flame retardant epoxy resins. Both Fourier transform infrared spectroscopy (FT-IR), mass spectrometry (MS) and nuclear magnetic resonance (NMR) measurements revealed the successful incorporation of DOPO on the molecular chains of MeTHPA through chemical reaction. The oxygen index analysis showed that the LPFA-cured epoxy resin exhibited excellent flame retardant performance, and the corresponding limiting oxygen index (LOI) value could reach 31.2%. The UL-94V-0 rating was achieved for the flame retardant epoxy resin with the phosphorus content of 2.7%. With the addition of LPFA, the impact strength of the cured epoxy resins remained almost unchanged, but the flexural strength gradually increased. Meanwhile, all the epoxy resins showed good thermal stability. The glass transition temperature (Tg) and thermal decomposition temperature (Td) of epoxy resin cured by LPFA decreased slightly compared with that of MeTHPA-cured epoxy resin. Based on such excellent flame retardancy, low viscosity at room temperature and ease of use, LPFA showed potential as an appropriate curing agent in the field of electrical insulation materials.

Preparation and properties of polyurethane coatings modified by polysilazane

2019 ◽  
Vol 32 (6) ◽  
pp. 611-619 ◽  
Author(s):  
Xiaoli Liu ◽  
Zhen Ge ◽  
Wenguo Zhang ◽  
Yunjun Luo
Keyword(s):  
Mechanical Property ◽  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Composite Films ◽  
Dip Coating ◽  
Water Contact ◽  
Research Attention ◽  
Elongation At Break ◽  
Coating Method ◽  
Dip Coating Method

Due to their unique physicochemical properties, polysilazanes exhibit excellent performance when combined with some resin matrixes, which had drawn great research attention. In this article, polyurethane (PU) was firstly prepared by polytetrahydrofuran glycol, isophorone diisocyanate, and 1,4-butanediol as main materials. Then, the prepared PU was blended with polysilazane by mixing the two solutions together, which was cured to films via dip-coating method at room temperature. The structure, thermal stability, and surface properties of the composite coatings were investigated by Fourier-transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy. The results demonstrated that after modification with polysilazane, the heat resistance, hydrophobicity, and mechanical property of the PU coatings were improved. When the content of polysilazane was 6 wt%, the mechanical property of the composite films was optimized, with a maximum tensile strength of 25.7 MPa and elongation at break of 797%. Meanwhile, the water contact angle of the composite film was 107° and the water absorption reached a minimum of 2.1%, which showed improved hydrophobicity and water resistance.

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