Preparation and Properties of Enzymatic Hydrolysis Lignin Modified Thermoplastic Starch Composites

2011 ◽  
Vol 306-307 ◽  
pp. 1717-1721
Author(s):  
Bin Liu ◽  
Qiu Feng Lv ◽  
Run Fang ◽  
Xian Su Cheng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Enzymatic Hydrolysis ◽  
Water Absorption ◽  
Thermoplastic Starch ◽  
Hydrolysis Lignin ◽  
Absorption Properties ◽  
Plasticized Starch ◽  
Environmentally Friendly Process ◽  
Scanning Electron

Thermoplastic starch composites modified by enzymatic hydrolysis lignin (EHL) were prepared via a simple and environmentally-friendly process. Starch and EHL were plasticized with urea and methanamide as plasticizers in the preparation. The effects of the amount of plasticizers and EHL on the mechanical and water-absorption properties were investigated. The fractured surfaces of the composites were studied by using scanning electron microscopy (SEM). Properties of the composites were improved with adding plasticized EHL into pure thermoplastic starch. It was attributed to the good compatibility of modified EHL with plasticized starch.

scholarly journals Soft nitrogen and sulfur incorporated into enzymatic hydrolysis lignin as an environmentally friendly antioxidant and mercury adsorbent

BioResources ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. 7341-7348 ◽  
Author(s):  
Wen-Xin Huang ◽  
Yu-Hua Zhang ◽  
Yuan-Yuan Ge ◽  
Li Qin ◽  
Zhi-Li Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antioxidant Activity ◽  
Fourier Transform ◽  
Enzymatic Hydrolysis ◽  
Environmentally Friendly ◽  
Hydrolysis Lignin ◽  
Strong Electron ◽  
High Antioxidant Activity ◽  
Scanning Electron

Soft donors of nitrogen and sulfur were incorporated into enzymatic hydrolysis lignin (EHL-NS) to make it suitable for multiple applications. Characterizations of the environmentally friendly material by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and thermogravimetric analysis confirmed the layered porous structure with nitrogen and sulfur groups. It exhibited high antioxidant activity due to the strong electron-donating capability of the soft donors. Moreover, the soft donors also contributed to the chemical complexation of Hg(II) with EHL-NS, which distinctly enhanced the adsorption of Hg(II) in water (Qe=180 mg/g, 25 °C). Given that the free radicals were highly effective at scavenging and adsorption, the functionalized enzymatic hydrolysis lignin is expected to serve a useful role.

scholarly journals Biocomposites Based on Thermoplastic Starch Reinforced with Recycled Paper Cellulose Fibers

2016 ◽  
Vol 855 ◽  
pp. 126-130 ◽  
Author(s):  
Amnuay Wattanakornsiri ◽  
Sampan Tongnunui ◽  
Tongsai Jamnongkan ◽  
Claudio Migliaresi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Water Absorption ◽  
Corn Starch ◽  
Cellulose Fibers ◽  
Thermoplastic Starch ◽  
Scanning Calorimetry ◽  
Recycled Paper ◽  
Mechanical Tensile ◽  
Scanning Electron

Biocomposites sheets were prepared by compression molding from mixtures of corn starch plasticized by glycerol as matrix and cellulose fibers, extracted from used office paper, as reinforcement filler with contents ranging from 0 to 8% wt/wt of fibers to matrix. Properties of composites were determined by mechanical tensile test, differential scanning calorimetry, thermogravimetric analysis, water absorption measurement, and scanning electron microscopy. The results showed that higher fibers content raised the tensile strength and elastic modulus up to 109% and 112%, respectively, when compared to the non-reinforced thermoplastic starch (TPS). The addition of the fibers improved the thermal resistance and decreased the water absorption up to 63.6%. Scanning electron microscopy illustrated a good adhesion between matrix and fibers.

Ionic Polyurethanes: Surface and Blood-Contacting Properties

1987 ◽  
Vol 110 ◽  
Author(s):  
Ann Z. Okkema ◽  
Thomas A. Giroux ◽  
Timothy G. Grasel ◽  
Stuart L. Cooper
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Water Absorption ◽  
Surface Properties ◽  
Platelet Activation ◽  
Ex Vivo ◽  
Unique Characteristic ◽  
Absorption Properties ◽  
Sulfonated Polymers ◽  
Scanning Electron

AbstractSulfonated polyetherurethanes, synthesized by the substitution of 0, 5, 10, 15, and 20% of the urethane nitrogens with propane sultone, were evaluated in this study. The water absorption properties are dramatically affected by the sulfonate content. The surface properties are also found to be influenced by the percentage of sulfonate incorporation. The blood-contacting properties, as determined by both an acute and chronic canine ex vivo experiment, show increased thromboresistance with increased propyl sulfonate incorporation. A unique characteristic of the highly sulfonated polymers is the negligible platelet activation and spreading observed using scanning electron microscopy.

Effect of compatibilizer on the properties of PBS/lignin composites prepared via a vane extruder

2015 ◽  
Vol 35 (9) ◽  
pp. 829-837 ◽  
Author(s):  
Huan Yu Liu ◽  
Fu Quan Chen ◽  
Rui Biao Guo ◽  
GuiZhen Zhang ◽  
JinPing Qu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Water Absorption ◽  
Interfacial Adhesion ◽  
Tensile Modulus ◽  
Softening Temperature ◽  
Flexural Property ◽  
Grafted Polymers ◽  
Butylene Succinate ◽  
Scanning Electron

Abstract Maleic anhydride (MAH) grafted polymers and silanes have been used as the compatibilizer in poly (butylene succinate)/lignin (PBS/lignin) composites. Compatibilized composites were fabricated by a novel vane extruder (VE). The effects of MAH grafted and coupling agent on the mechanical, thermal property, rheological property and water absorption of PBS/lignin were investigated. The results showed that the use of MAH grafted polymers and silanes resulted in significant improvements in flexural property, tensile modulus and tensile strength. Furthermore, MAH grafted polymers and silanes exhibited some improvement on the properties of vicat softening temperature as well as water absorption. The composites treated by MAH grafted polymers and silanes showed non-Newtonian behaviors from rheological tests. A better interfacial adhesion between lignin and matrix was observed from the scanning electron microscopy (SEM) of the compatibilized composites.

scholarly journals Effect of metal ions and surfactants on the enzymatic hydrolysis of pretreated lignocellulose

BioResources ◽  
2019 ◽  
Vol 14 (1) ◽  
pp. 1653-1667
Author(s):  
Yawen Zhou ◽  
Jian Yang ◽  
Cong Luo ◽  
Bo Yang ◽  
Changyao Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Enzymatic Hydrolysis ◽  
Infrared Spectrum ◽  
Metal Ions ◽  
Spectrum Analysis ◽  
Tween 80 ◽  
High Porosity ◽  
Hydrolysis Of ◽  
Scanning Electron

The effect of metal ions and surfactants on the enzymatic hydrolysis of pretreated wheat straw lignocellulose was investigated. Scanning electron microscopy, infrared spectrum analysis, dynamic light scattering, and fluorescence spectra analysis were used to characterize the influence of Fe3+/ polyoxyethylene (20) sorbitan monooleate (Tween 80). The interaction between Fe3+/Tween 80 and enzyme was further investigated by enzyme kinetics and enzyme activity measurements. The best synergistic effect was obtained when the ratio of Fe3+ and Tween 80 was 0.06. The scanning electron microscopy images showed that the Fe3+/Tween 80 combination was associated with high porosity substrates. The infrared spectrum analysis indicated that the components of the substrates depended on additive types. The highest relative enzymatic activity increase rate was obtained with added Fe3+/ Tween 80. The Vmax and Km values of the group with added Fe3+/Tween 80 were much higher than that of the group without additives. With the addition of Fe3+/ Tween 80, the intensity of the fluorescence emission peak decreased and the peak shifted towards a longer wavelength.

Study on the modification of polyester resin bamboo fiber-based composite with euphorbia coagulum and their effect on mechanical and thermal properties

2020 ◽  
Vol 54 (24) ◽  
pp. 3473-3480 ◽  
Author(s):  
Sanju Kumari ◽  
Ritesh Kumar ◽  
Bhuvneshwar Rai ◽  
Sidhharth Sirohi ◽  
Gulshan Kumar
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermogravimetric Analysis ◽  
Water Absorption ◽  
Polymer Blend ◽  
Polyester Resin ◽  
Bamboo Fiber ◽  
Synthetic Fiber ◽  
Mechanical And Thermal Properties ◽  
Scanning Electron

Environmental problems caused by extensive use of polymeric materials can be solved by replacing the synthetic petroleum-based resins with natural biodegradable resins, and synthetic fiber with natural plant fiber. The blend based on euphorbia coagulum and polyester resin with different ratio of both the polymers is produced. In the polymer blend, methyl ethyl ketone peroxide used as an initiator and cobalt naphthenate as an accelerator was added. Bamboo fiber was incorporated into the polymer blend as the natural filler to fabricate composite. Herein, untreated as well as alkali treated bamboo fiber was used to fabricate the composite. Alkali treatment enhanced the compatibility between the polymer blend and the fiber. To evaluate the properties of composites, water absorption, scanning electron microscopy, mechanical test, thermogravimetric analysis, and infrared spectroscopy have been performed. Scanning electron microscopy analysis of composite shows better interlocking between the polymer blend and the fiber. The maximum enhancement in mechanical properties were observed in composite with 30% euphorbia coagulum such as tensile strength, Young’s modulus, flexural strength, and impact strength were increased up to 11%, 48%, 8%, and 60%, respectively, and water absorption decreased up to 47%. Thermogravimetric analysis and differential scanning calorimetry analysis of composite with 30% euphorbia coagulum show enhanced thermal stability up to 8%. Composite material developed was ecofriendly and can be useful for the multipurpose panel, beam, and pedestrian bridge and can replace petroleum products.

Preparation and Characterisation of Konjac Glucomannan (KGM)/SiO2 Nanoparticles Blend Film

2011 ◽  
Vol 194-196 ◽  
pp. 1431-1436
Author(s):  
Chao Wang ◽  
Bi Jun Xie ◽  
Bin Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Infrared Spectra ◽  
Nanocomposite Materials ◽  
Ultraviolet Absorption ◽  
Nanocomposite Films ◽  
Absorption Properties ◽  
Blend Film ◽  
Scanning Electron

A novel nanocomposite films was prepared by dispersing SiO2 nanoparticles in aqueous konjac glucomanan (KGM) solution. The structure and miscibility of the nanocomposite materials were determined finely by viscosimetry, Fourier transformed infrared spectra (FTIR), micropolariscope (POM), scanning electron microscopy (SEM) and ultraviolet-visible spectrophotometer (UV-Vis). The results indicated that there was a strong interaction between KGM and SiO2 in ethanolamine. The miscibility and ultraviolet-absorption properties of KGM/SiO2 nanoparticles blend film were improved by ball milling treatment. Moreover, the ultraviolet absorption and tensile strength of the nanocomposite films rapidly increase with the increase of SiO2, while breaking elongation of the nanocomposite films slightly decreased.

Effect of electrospinning parameters on production of polyvinyl alcohol/polylactic acid nanofiber using a mutual solvent

2021 ◽  
pp. 096739112110271
Author(s):  
Reyhaneh Fatahian ◽  
Mohammad Mirjalili ◽  
Ramin Khajavi ◽  
Mohammad Karim Rahimi ◽  
Navid Nasirizadeh
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Water Absorption ◽  
Average Diameter ◽  
Poly Lactic Acid ◽  
Poly Vinyl Alcohol ◽  
Mean Diameter ◽  
Scanning Electron

Differences in the properties of poly(vinyl alcohol) (PVA) and poly (lactic acid) (PLA) polymers have attracted much attention today. In this research, the aim is to produce PVA/PLA nanofibers with hydrophilicity and good mechanical properties using a mutual solvent. In this regard, the ability to produce PVA/PLA nanofibers using a mutual solvent was evaluated. The effect of electrospinning parameters on the morphology of nanofibers, hydrophilicity of nanofibers produced by measuring water absorption and contact angle as well as mechanical properties of nanofibers were considered. The results obtained from scanning electron microscopy analyses of the structure of these fibers showed that PVA had the highest viscosity of 5.64 Pa.s and the highest diameter of 260 nm, which decreased the thickness of the nanofibers with increasing PLA. And pure PLA had the lowest mean diameter of 76 nm. In the consideration of the mechanical properties of the prepared nanofibers, it was found that the combination of PLA and PVA nanofibers will lead to overlap the properties of each other and the creation of desirable mechanical properties. Moreover, in the investigation of water absorption and contact angle, it was concluded that the PVA/PLA was fully absorbed in less than 200 seconds and the samples have a contact angle of less than 52°. Finally, it was found that the average diameter of the produced nanofibers was decreased by increasing the voltage and the needle tip to collector distance by considering the PVA/PLA samples with a ratio of 50:50.

scholarly journals A Green Method for the Enhancement of Antifungal Properties of Various Textiles Functionalized with Silver Nanoparticles

2020 ◽  
Vol 10 (6) ◽  
pp. 7284-7294
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silver Nanoparticles ◽  
Water Absorption ◽  
Current Trend ◽  
Green Method ◽  
X Ray ◽  
Wide Range ◽  
Elemental Contents ◽  
Scanning Electron

Development of textiles functionalized with nanoparticles has received growing interest. A wide range of nanoparticles can be deposited on textile fibers, which brings new properties to the final product. Although many methods for the deposition of silver nanoparticles (AgNPs) on textiles are possible, the current trend focuses on how this can be carried out in a cheaper and greener manner. Therefore, the present study aims to propose a green method for the enhancement of antifungal of textiles using AgNPs. Textile properties such as surface morphology, elemental contents, density, water absorption, and antifungal capability were comprehensively characterized. This study found that the deposition of AgNPs on the textiles can be successfully carried out using the proposed method, confirmed by the field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDX) inspections. The water absorption capability of the treated textiles was lower compared to untreated textiles. In addition, the effective antifungal capability of the treated textiles has been approved, although after 5 washing cycles.

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