scholarly journals Fabrication of a novel high-performance leather waste-based composite retention aid

RSC Advances ◽  
2019 ◽  
Vol 9 (28) ◽  
pp. 16271-16277 ◽  
Author(s):  
Yaohui You ◽  
Jiayong Zhang ◽  
Xubing Sun
Keyword(s):  
Aluminum Chloride ◽  
High Performance ◽  
Crosslinking Agent ◽  
Starting Material ◽  
Collagen Hydrolysate ◽  
Modifying Agent ◽  
Leather Waste

A novel biomass composite retention aid was developed by using collagen hydrolysate extracted from collagen waste as starting material, glutaraldehyde as organic crosslinking agent and polymeric aluminum chloride as inorganic modifying agent.

scholarly journals A low-cost and water resistant biomass adhesive derived from the hydrolysate of leather waste

RSC Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 4024-4029 ◽  
Author(s):  
Jianfei Zhou ◽  
Teng Xu ◽  
Xiaoling Wang ◽  
Chang Liu ◽  
Xuepin Liao ◽  
...  
Keyword(s):  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Low Cost ◽  
Crosslinking Agent ◽  
Starting Material ◽  
Collagen Hydrolysate ◽  
Silane Coupling ◽  
Leather Wastes ◽  
Leather Waste

A low-cost and water resistant biomass adhesive was prepared by using collagen hydrolysate extracted from leather wastes as the starting material and silane coupling agent as the crosslinking agent.

A trait collection of spring groat barley

2018 ◽  
pp. 85-96
Author(s):  
I.A. Petukhova ◽  
V.K. Riabchun ◽  
V.A. Muzapharova ◽  
O.I. Padalka ◽  
T.A. Sheliakina ◽  
...  
Keyword(s):  
High Performance ◽  
Spring Barley ◽  
Vegetation Period ◽  
Grain Weight ◽  
Starting Material ◽  
Economic Traits ◽  
The Czech Republic ◽  
Science And Education ◽  
New Varieties ◽  
1000 Grain Weight

The goal of our research was to form a collection of groats barley, to search, to select and to evaluate starting material of spring barley for a set of valuable economic traits, technological properties and culinary qualities of barley groats. Results and Discussion. Basing on to the results of assessments, we identified selected 55 spring barley accessions, which were characterized by 17 traits and 75 expression levels. The collection includes accessions from 11 countries; the largest number of accessions (59) are from Ukraine; 39 – from Russia; 10 - from Belarus; 10 - from Germany; 6 - from France; 5 - from Kazakhstan; 4 - from Canada; 3 - from the Czech Republic; 2 – from Great Britain; 1 accesson is from Serbia; and 1 - from Austria. Accessions combining high levels of expression of different traits are the most valuable. They include the following accessions: Doridnyi, Vodohrai, Sviatomykhailivskyi, Svarozhych, Soka, Іlot (UKR). Naked accessions include: Akhilles (UKR), Mayskiy, Oskar, Golozyornyy 1, Omskiy Golozyornyy 1 (RUS), CDC Alamo, CDC Candle (CAN). These varieties can be starting material for creation of new modern high-performance spring groats barley varieties. Ten valuable accessions registered with the NCPGRU (Sovіra, Doridnyi, Soka, Vodohrai, Partner, Yukatan, Avhii, Svarozhych, Baskak, and Virtuoz) were included in the trait groats collection. Conclusions. Basing on the results of multiyear studies, we formed the trait collection of spring groats barley comprising 140 accessions from 11 countries. The collection includes 55 reference accessions that cover 17 traits (plant height, vegetation period, ear length, grain weight per ear, 1000-grain weight, grain shape, grain evenness, vitreousness, culinary qualities of barley groats, etc.) characterized by 75 levels of their expression. The collection is of considerable value for science and education. The accessions selected allow improving the efficiency of breeding to create new varieties with high technological and culinary properties as well as with a set of valuable economic characteristics.

scholarly journals An Efficient and Sustainable Approach to Prepare Carboxylated Cellulose Nanocrystals for Rubber Reinforcement Featuring Dual Crosslinking Networks

2021 ◽  
Author(s):  
Jie Hu ◽  
Zhengqing Kong ◽  
Ke Liu ◽  
Jinli Qin ◽  
Yuhong Tao ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
High Performance ◽  
Chemical Reactivity ◽  
Epoxy Group ◽  
Crosslinking Agent ◽  
Covalent Bond ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Carboxyl Groups ◽  
Butadiene Rubber

Abstract The surface functionalization of CNCs and the construction of strong interfacial adhesion between CNCs and rubber matrix are effective way to achieve high performance rubber/CNCs nanocomposites. Herein, carboxylation of sulphated cellulose nanocrystals (CNC-OSO3H) was conducted in aqueous medium by using citric acid as modifier. Large amount of carboxyl groups was successfully grafted on the surface of CNC-OSO3H, which endows the carboxylated CNC-OSO3H (abbreviate as CNC-CA) with higher chemical reactivity and thermal stability. Subsequently, carboxylated styrene butadiene rubber (XSBR)/CNC-CA nanocomposites with dual crosslinking design were prepared by using polyethylene glycol diglycidyl ether (PEGDE) as the crosslinking agent and CNC-CA as the reinforcing fillers. FTIR investigation found that in the obtained nanocomposites, the carboxyl groups on CNC-CA and XSBR formed hydrogen bonds (physical crosslinking) with each other, and the carboxyl groups formed covalent bond with the epoxy group on PEGDE simultaneously. The coexistence of physical and chemical crosslinking improved the interface compatibility between CNC-CA and XSBR matrix, accelerated the homogenous dispersion of CNC-CA and realized the crosslinking of the matrix itself. As expected, XSBR/CNC-CA nanocomposites with dual crosslinking network showed remarkable enhancement in tensile strength (up to 500%), modulus (up to 151%), work of fracture (up to 348%). This work provides both a facile and green approach to obtain carboxylated CNCs and a convenient method for the preparation of high-performance rubber nanocomposites with multiple interactions.

scholarly journals Determination of Triglycidyl Isocyanurate in Workplace Air

2019 ◽  
Vol 16 (22) ◽  
pp. 4455
Author(s):  
Anna Jeżewska ◽  
Joanna Kowalska
Keyword(s):  
High Performance ◽  
Limit Of Detection ◽  
Crosslinking Agent ◽  
Measurement Range ◽  
Array Detector ◽  
Phase System ◽  
Limit Of Quantification ◽  
Workplace Air ◽  
Air Sample ◽  
Triglycidyl Isocyanurate

Triglycidyl isocyanurate (TGIC) is a white solid in powder or granular form. TGIC does not occur naturally in the environment. It is intentionally manufactured and used as a crosslinking agent or hardener to produce polyester powder coatings. TGIC may cause genetic defects. This article presents the method of TGIC determination in workplace air using high-performance liquid chromatography (HPLC) with a diode-array detector (DAD). The method is based on the collection of TGIC present in the air on a polypropylene filter, extraction with acetonitrile, and chromatographic analysis of the solution obtained in this way. The determination was carried out in the reverse-phase system (mobile phase: acetonitrile: water) using an Ultra C18 column. The measurement range is 2 to 40 µg/m3 for a 720 liters air sample. Limit of detection (LOD) is 23 ng/m3 and limit of quantification (LOQ): 70 ng/m3. The method can be used for assessing occupational exposure to TGIC and associated risk to workers’ health.

Preparation of Poly(γ-Glutamic Acid)/Montmorillonite Superabsorbent Nanocomposite

2012 ◽  
Vol 531-532 ◽  
pp. 609-613
Author(s):  
Xu Man Wang ◽  
Cai Ning Zhang
Keyword(s):  
Polyethylene Glycol ◽  
Glutamic Acid ◽  
Reaction Temperature ◽  
Saline Water ◽  
Crosslinking Agent ◽  
Experimental Results ◽  
Water Absorbency ◽  
Modifying Agent

Montmorillonite (MMT) was applied as the modifying agent, polyethylene glycol bisglycidyl ether as crosslinking agent, Poly(γ-glutamic acid)/montmorillonite (γ-PGA/MMT) superabsorbent nanocomposite was prepared. The effects of crosslinking agent mass, MMT contents and reaction temperature on the saline water absorbency of the superabsorbent nanocomposites were studied. The experimental results demonstrated that the saline water absorbency of γ-PGA/MMT nanocomposites increased with the increasing of crosslinking agent mass firstly and decreased when the crosslinking agent mass was higher than 0.6g. The saline water absorbency of γ-PGA/MMT nanocomposites increased with the MMT contents up to 7% and decreased as the MMT contents further increased. Moreover, the saline water absorbency of γ-PGA/MMT nanocomposites increased with the reaction temperature firstly, and then decreased when the reaction temperature was higher than 50°C.

scholarly journals Starch biotransformation into isomaltooligosaccharides using thermostable alpha-glucosidase from Geobacillus stearothermophilus

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5086 ◽  
Author(s):  
Peng Chen ◽  
Ruixiang Xu ◽  
Jianhui Wang ◽  
Zhengrong Wu ◽  
Lei Yan ◽  
...  
Keyword(s):  
High Performance ◽  
Crosslinking Agent ◽  
Small Scale ◽  
Cross Linking ◽  
Geobacillus Stearothermophilus ◽  
Isolation And Purification ◽  
Chitosan Membrane ◽  
Scale Preparation ◽  
Layer Chromatography ◽  
Alpha Glucosidase

The present study first identified the biotransformation of starch as a novel preparation method was investigated using the alpha-transglucosidase-producing Geobacillus stearothermophilus U2. Subsequently, 5 L- and 20 L-scale fermentations were performed. After isolation and purification, liquid alpha-glucosidase preparations were obtained. Through covalent cross-linking and adsorption cross-linking using chitosan as the carrier and glutaraldehyde as the crosslinking agent, the conditions for immobilization of alpha-glucosidase on chitosan were determined. Moreover, Isomaltooligosaccharides (IMOs) were then prepared using chitosan membrane-immobilized alpha-glucosidase, beta-amylase, pullulanase, fungal alpha-amylase and starch as substrate. The mixed syrup that contained IMOs was evaluated and analyzed by thin-layer chromatography (TLC) and high-performance liquid chromatography (HPLC). In addition, small-scale preparation of IMOs was performed. These results are a strong indication that the alpha-transglucosidase-producing G. stearothermophilus as a potential application technique can be successfully used to prepare industrial IMOs.

scholarly journals Multifunctional flexible membranes from sponge-like porous carbon nanofibers with high conductivity

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jianhua Yan ◽  
Keqi Dong ◽  
Yuanyuan Zhang ◽  
Xiao Wang ◽  
Ahmed Abdulqawy Aboalhassan ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Porous Carbon ◽  
High Performance ◽  
Gas Adsorption ◽  
Crosslinking Agent ◽  
Poly Vinyl Alcohol ◽  
Dual Phase ◽  
Chemical Crosslinking ◽  
Surface Areas ◽  
Liquid Storage

AbstractConductive porous carbon nanofibers are promising for environmental, energy, and catalysis applications. However, increasing their porosity and conductivity simultaneously remains challenging. Here we report chemical crosslinking electrospinning, a macro–micro dual-phase separation method, to synthesize continuous porous carbon nanofibers with ultrahigh porosity of >80% and outstanding conductivity of 980 S cm−1. With boric acid as the crosslinking agent, poly(tetrafluoroethylene) and poly(vinyl alcohol) are crosslinked together to form water-sol webs, which are then electrospun into fibrous films. After oxidation and pyrolysis, the as-spun fibers are converted into B-F-N triply doped porous carbon nanofibers with well-controlled macro–meso–micro pores and large surface areas of ~750 m2 g−1. The sponge-like porous carbon nanofibers with substantially reduced mass transfer resistances exhibit multifunction in terms of gas adsorption, sewage disposal, liquid storage, supercapacitors, and batteries. The reported approach allows green synthesis of high-performance porous carbon nanofibers as a new platform material for numerous applications.

Coloring Mechanism of Rare Earth Polishing Powder and Study of its Factors

2014 ◽  
Vol 538 ◽  
pp. 36-39
Author(s):  
En Wu Liang ◽  
Shou Zhi Yi ◽  
Zhi Jie Wei ◽  
Li Hua Ren ◽  
Zhong Xin Fang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Chemical Composition ◽  
High Performance ◽  
Great Influence ◽  
Starting Material ◽  
Control Production ◽  
Color Control

The better appearance of LCD rare earth polishing powder, the better sales. High-performance polishing powder for LCD was synthesized by using NH4HCO3 subsidence method, with rare earth carbonate as starting material. Coloring mechanism of rare earth polishing powder was studied by using TGA, XRD and so on. Color of rare earth polishing powder was quantitative described with the values of L, a, b, R, and chemical composition had a great influence on it. The result showed that Ca, Mg, Zn, Mn, P, Fe, Cu had a great effect on the white color of rare earth polishing powder, and the color had regular changes with chemical composition, calcining temperature, calcining time. The result can control production of rare earth polishing powder based its color, and it has significant practical value to color control of rare earth polishing powder.

Synthesis and application of an alkaline crosslinking agent containing acrylamide as the durable press finishing agent on cotton fabric

2018 ◽  
Vol 89 (11) ◽  
pp. 2084-2097 ◽  
Author(s):  
Fuqiang Li ◽  
Hongchen Wang ◽  
Jinxin He
Keyword(s):  
Cotton Fabric ◽  
High Performance ◽  
Water Solubility ◽  
Low Cost ◽  
Crosslinking Agent ◽  
Proton Nuclear Magnetic Resonance ◽  
Durable Press ◽  
Washing Durability ◽  
Durable Press Finishing ◽  
Crosslinking Agents

In this study, acrylamide-containing crosslinking agents 2,4-diacrylamidebenzenesulfonic acid (AC-DABS1) and 2,5-diacrylamidebenzenesulfonic acid (AC-DABS2) were synthesized and applied to cotton fabric as durable press finishing agents under alkaline conditions. The target products were characterized by high-performance liquid chromatography (HPLC) and proton nuclear magnetic resonance. The stability of the acrylamide group in alkaline solution was investigated by model compound para-acrylamidebenzenesulfonic acid. The efficiency of AC-DABS1 and AC-DABS2 as durable press finishing agents was examined and compared by testing the wrinkle recovery angle (WRA), tearing strength retention (TSR) and washing durability under different conditions using the steaming process. The performance of fabric treated with 1,3,5-triacroylaminohexahydro-s-triazine (FAP) was also investigated and compared with those treated with acrylamide-containing crosslinking agents. The results showed that the anti-crease effects of FAP were better than those of the new synthesized agents. However, the new synthesized agents have the advantage of water solubility and low cost. The fabric treated with new synthesized agents presented satisfactory WRA and TSR, indicating that AC-DABS1 and AC-DABS2 can be utilized as effective alkaline crosslinking agents. In addition, the different performance of the FAP-treated fabric and fabric treated with the new synthesized agents was illustrated by the HPLC method.

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