Synthesis and Performance Study of Polybasic Starch Graft Copolymerization Function Materials

2009 ◽  
Vol 79-82 ◽  
pp. 43-46 ◽  
Author(s):  
Yan Bo Wu ◽  
Cheng Fei Lv ◽  
Mei Na Han
Keyword(s):  
Reaction Time ◽  
Vinyl Acetate ◽  
Reaction Temperature ◽  
Butyl Acrylate ◽  
Corn Starch ◽  
Graft Copolymerization ◽  
Wood Adhesive ◽  
National Standard ◽  
Polymerization Reaction ◽  
Initiator Concentration

The graft copolymerization of mixed grafting monomers vinyl acetate and butyl acrylate onto grafting skeleton of corn starch have been investigated using ammonium persulfate as initiator. Starch based wood adhesive prepared by in emulsion synthesis have green material, superior property, low cost. The effects of various factors on the graft copolymerization were studied such as reaction time, reaction temperature, initiator concentration as well as match of mixed monomers. By single-factor tests, the optimum graft copolymerization conditions with higher grafting efficiency and grafting percent ratio correspond to the reaction time of 3h, the graft polymerization reaction temperature of about 65°C, the initiator concentration of 9.7×10-3mol/L, the mixed grafting monomers concentration of 1.0 mol/L, the volume ratio of vinyl acetate to butyl acrylate of 5:5. The starch graft copolymer after purification was characterized, and its properties were determined. IR spectra of graft copolymers indicated that the carbonyl group characteristic absorption peak existed at 1730～1740cm-1 besides that of starch. The XRD pattern showed there were several dispersion peaks, therefore the graft copolymerization was the concomitant structure of a little crystalline state and amorphous state. TG and DTA curves confirmed the occurrence of graft copolymerization, and showed that the thermal stability of starch copolymer was better than that of pure corn starch. Starch based wood adhesive is white or cream white emulsion paste, excellent emulsive properties and high temperature stability. All properties of starch based wood adhesive can meet the national standard HG/T2727 - 95 of polyvinyl acetate wood adhesive, and the compressive shear strength outdistances the national standard especially.

Preparation of A Spherical Cellulose Adsorbent as Amino Acid Sorbent

2011 ◽  
Vol 197-198 ◽  
pp. 899-905 ◽  
Author(s):  
Chun Xiang Lin ◽  
Ming Hua Liu ◽  
Huai Yu Zhan
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Reaction Time ◽  
Acrylic Acid ◽  
Reaction Temperature ◽  
Monomer Concentration ◽  
Initiator Concentration ◽  
Basic Amino Acids ◽  
Cellulose Adsorbent

The spherical cellulose adsorbent was prepared by grafting acrylic acid onto the spherical cellulose beads prepared by NMMO method. The effecting factors, e.g., monomer concentration, initiator concentration, reaction temperature and reaction time were optimized by the orthogonal and signal-factor experiments and the structure of the adsorbent was characterized by FTIR and SEM. The graft mechanism was also discussed. Moreover, the spherical cellulose adsorbents were shown to behave as good sorbents for basic amino acids L-Arg, L-Lys and L-His.

scholarly journals The Emulsion Polymerization of Each of Vinyl Acetate and Butyl Acrylate Monomers Using bis (2-ethylhexyl) Maleate for Improving the Physicomechanical Properties of Paints and Adhesive Films

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
K. A. Shaffei ◽  
A. B. Moustafa ◽  
A. I. Hamed
Keyword(s):  
Emulsion Polymerization ◽  
Vinyl Acetate ◽  
Butyl Acrylate ◽  
Polyvinyl Acetate ◽  
Physicomechanical Properties ◽  
Polymerization Reaction ◽  
Molecular Weights ◽  
Acrylate Copolymer ◽  
Water Sensitivity ◽  
Acrylate Monomers

Improving the water sensitivity of polyvinyl acetate PVAc films as well as pressure sensitivity, adhesion and washability of polybutyl acrylate were achieved by using bis (2-ethylhexyl) maleate (BEHM). The emulsion polymerization kinetics of vinyl acetate and butyl acrylate in presence of BEHM was studied. The order of the polymerization reaction with respect to the BEHM in presence of each of vinyl acetate and butyl acrylate was studied. The physicomechanical properties of the polyvinyl acetate films and vinyl acetate-butyl acrylate copolymer films were studied in presence of BEHM and the obtained results were matched with those prepared in the presence of pluronic F 108 and showed superior values. The obtained mean average molecular weights were found to be smaller in presence of BEHM assuring the presence of chain transfer reaction.

scholarly journals Optimisation of reaction parameters for a novel polymeric additives as flow improvers of crude oil using response surface methodology

2021 ◽  
Author(s):  
Ibrahim Elganidi ◽  
Basem Elarbe ◽  
Norida Ridzuan ◽  
Norhayati Abdullah
Keyword(s):  
Response Surface Methodology ◽  
Reaction Time ◽  
Regression Model ◽  
Crude Oil ◽  
Response Surface ◽  
Reaction Temperature ◽  
Yield Response ◽  
Initiator Concentration ◽  
Oil Pipeline ◽  
Polymeric Additives

AbstractIn recent years, polymeric additives have received considerable attention as a wax control approach to enhance the flowability of waxy crude oil. Furthermore, the satisfactory model for predicting maximum yield in free radical polymerisation has been challenging due to the complexity and rigours of classic kinetic models. This study investigated the influence of operating parameters on a novel synthesised polymer used as a wax deposition inhibitor in a crude oil pipeline. Response surface methodology (RSM) was used to develop a polynomial regression model and investigate the effect of reaction temperature, reaction time, and initiator concentration on the polymerisation yield of behenyl acrylate-co-stearyl methacrylate-co-maleic anhydride (BA-co-SMA-co-MA) polymer by using central composite design (CCD) approach. The modelled optimisation conditions were reaction time of 8.1 h, reaction temperature of 102 °C, and initiator concentration of 1.57 wt%, with the corresponding yield of 93.75%. The regression model analysis (ANOVA) detected an R2 value of 0.9696, indicating that the model can clarify 96.96% of the variation in data variation and does not clarify only 3% of the total differences. Three experimental validation runs were carried out using the optimal conditions, and the highest average yield is 93.20%. An error of about 0.55% was observed compared with the expected value. Therefore, the proposed model is reliable and can predict yield response accurately. Furthermore, the regression model is highly significant, indicating a strong agreement between the expected and experimental values of BA-co-SMA-co-MA yield. Consequently, this study’s findings can help provide a robust model for predicting maximum polymerisation yield to reduce the cost and processing time associated with the polymerisation process.

Preparation and Application of Polyacrylamide-Grafted Starch Flocculant

2014 ◽  
Vol 875-877 ◽  
pp. 44-48 ◽  
Author(s):  
Ming Gao ◽  
Zhi Qiang Xu
Keyword(s):  
Reaction Temperature ◽  
Corn Starch ◽  
Monomer Concentration ◽  
Coal Slurry ◽  
Solution Polymerization ◽  
Optimal Conditions ◽  
Initiator Concentration ◽  
Ft Ir ◽  
Substrate Ratio ◽  
Additional Dosage

A polyacrylamide-grafted starch (St-g-PAM) flocculant for the coal slurry wastewater, was prepared by using corn starch and acrylamide (AM) as monomers through solution polymerization. The structure of the synthesized St-g-PAM was characterized by FT-IR and TG. The effects of initiator concentration, reaction temperature, and monomer concentration on percentage of grafting and the grafting efficiency were investigated. The results show that the optimal conditions of the polymerization are as follows: the monomer to substrate ratio of 2.5, potassium persulfate of 0.08 g/mL, reaction time of 3h, the reaction temperature of 65°C. The additional dosage of St-g-PAM is varying between 35 and 45 mg/L to obtain good flocculation capability, better flocculation capability with the addition of 30mg/L of FeCl3.

Preparation of Anionic Polyacrylamide-Grafted Starch Flocculant and its Application

2013 ◽  
Vol 815 ◽  
pp. 432-436 ◽  
Author(s):  
Ying Juan Sun ◽  
Guo Feng Guo ◽  
Yong Li Yang
Keyword(s):  
Reaction Temperature ◽  
Corn Starch ◽  
Monomer Concentration ◽  
Coal Slurry ◽  
Solution Polymerization ◽  
Optimal Conditions ◽  
Initiator Concentration ◽  
Substrate Ratio ◽  
Additional Dosage ◽  
Anionic Polyacrylamide

An anionic polyacrylamide-grafted starch (St-g-APAM) flocculant for the coal slurry waste water, was prepared by using corn starch and acrylamide (AM) as monomers, acrylic acid (AA) as anionic monomer through solution polymerization. The effects of initiator concentration, reaction temperature, and monomer concentration on percentage of grafting and the grafting efficiency were investigated. The results show that the optimal conditions of the polymerization are as follows: the monomer to substrate ratio of 2.0, AM:AA ratio of 2:1, potassium persulfate of 0.7 x 10-3mol/L, reaction time of 4h, the reaction temperature of 50°C. The additional dosage of St-g-APAM is varying between 10 and 20 mg/L to obtain good flocculation capability.

Synthesis of Chitosan Grafted Ternary Polymerization

2010 ◽  
Vol 160-162 ◽  
pp. 1816-1821
Author(s):  
Yu Jie Wang ◽  
Juan Qin Xue ◽  
Wei Bo Mao ◽  
Ming Wu ◽  
Jing Xian Li
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Graft Copolymerization ◽  
Experimental Results ◽  
Optimal Synthesis ◽  
Synthesis Conditions ◽  
Graft Yield ◽  
The Stability

In this study, the graft copolymerization of acryalmide and acrylonitrile onto chitosan with K2S2O8-NaHSO3 initiator under N2 interaction is studied and the mechanism is discussed. Compared to the chitosan graft of acrylamide or acrylonitrile, the graft yield and graft efficiency of ternary polymerization increase significantly. The stability and reproducibility are also improved obviously. To be specific, the reaction time, the reaction temperature, the effect of the amount of materials, the concentration of K2S2O8, and the concentration of NaHSO3 on the graft yield and graft efficiency is investigated respectively. The C=C of acrylamide and the acrylonitrile react respectively with -NH2 and C6-OH of chitosan initiated by SO4-•. The experimental results show that the optimal synthesis conditions are given as follows: the reaction time is 6h, the reaction temperature is 60°C, the ratio of m(chitosan):m(acrylamide):m(acrylonitrile) is 1:7:5, the concentration of K2S2O8 is 4.5mmol/L, and the concentration of NaHSO3 is about 2.6mmol/L. Under such conditions the graft yield and graft efficiency can be up to 839.52% and 70.00%, respectively.

The Research of the Preparation and Characterization of Selective Flocculant Suitable for Fine Hematite

2013 ◽  
Vol 303-306 ◽  
pp. 2572-2576 ◽  
Author(s):  
Jin Xia Zhang ◽  
Da Yong Zhang ◽  
Huai Xiang Li ◽  
Fu Sheng Niu
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Soluble Starch ◽  
Mass Ratio ◽  
Initiator Concentration ◽  
Single Factor ◽  
Selective Flocculation ◽  
Flocculation Test ◽  
Polymer Flocculant ◽  
The Impact

This paper, a comprehensive analysis of selective flocculation am fine hematite selected based on the combination of soluble starch and the characteristics of acrylamide was prepared soluble starch - grafting of acrylamide polymer flocculant. Conditions of single-factor experiment studied the conditions on the starch - the impact of acrylamide polymerization and to the level of starch graft ratio to measure the various conditions on the polymerization to determine the optimal conditions of each are as follows: initiator using cerium nitrate Ammonium; initiator concentration 0.001moL / L; AM / soluble starch mass ratio of 2:1; reaction time of 2h; the reaction temperature is 60 °C. In terms of single-factor test, designed a four factors and three levels of the orthogonal test, the optimum conditions are: starch and monomer mass ratio of 1:2; initiator concentration of 0.001 mol / L; the reaction temperature is 65 °C; reaction time was 1.5h. Under these conditions, starch and the grafting rate of 153.24. By scanning electron microscopy and infrared spectrum we can see, the namely, the resulting polymer soluble starch and acrylamide graft copolymer. By hematite flocculation test we can see, with flocculants prepared by flocculation, its ability to better than selective flocculation.

Selective Oxidation of Corn Starch in TEMPO-Mediated System

2014 ◽  
Vol 1051 ◽  
pp. 221-224 ◽  
Author(s):  
Yan Fang Hu ◽  
Xiao Dong Zhang ◽  
Zhao Guang Nie ◽  
Ya Cheng Xing ◽  
Bo Qun Lin ◽  
...  
Keyword(s):  
Reaction Time ◽  
Selective Oxidation ◽  
Reaction Temperature ◽  
Mass Fraction ◽  
Corn Starch ◽  
Oxidized Starch ◽  
Oxidized Corn Starch ◽  
Relationship Of ◽  
The Relationship ◽  
Oxidation System

With TEMPO-NaClO-NaBr as the selective oxidation system, the oxidized corn starch was prepared from the corn starch, substituting traditional pre-gelatinized corn starch. The relationship of the carboxyl mass fraction of the oxidized starch and the dosage of oxidant was studied under the conditions such as: the mass of the corn starch was 5.0g, the pH was 10.00, the reaction temperature was 20 °C. The structure of the oxidized corn starch was characterized by IR. The results showed that when the consumption of NaClO was 67.5 mL, the reaction time was 2.5 h, the carboxyl of oxidized starch can reach 10.60%.

Effects of Polymerization Parameters on Aqueous Deposited Copolymerization of Acrylonitrile and Itaconic Acid

2013 ◽  
Vol 774-776 ◽  
pp. 508-511
Author(s):  
Ya Qi Zhao ◽  
Qiao Feng ◽  
Ling Zhi Du
Keyword(s):  
Molecular Weight ◽  
Reaction Time ◽  
High Molecular Weight ◽  
Reaction Temperature ◽  
Itaconic Acid ◽  
Temperature Region ◽  
Monomer Concentration ◽  
Initiator Concentration ◽  
Molecular Weights ◽  
Total Monomer Concentration

Pure powdery high molecular weight polyacrylonitrile (HMW-PAN) copolymers were firstly synthesized by aqueous deposited polymerization (ADP) technique employing 2,2'-Azobis (isobutyramidine) dihydrochloride (AIBA) as initiator and itaconic acid (IA) as comonomer. Various PAN polymers were obtained through changing different polymerization parameters. It is indicated that with the increase of total monomer concentration, initiator concentration, reaction temperature and reaction time, polymerization conversions of PAN copolymers all increased. While the molecular weights become greater with the increase of total monomer concentration. With the increase of initiator concentration and reaction temperature (under higher reaction temperature region), the molecular weights decreased. However, the molecular weights only had very little decrease at the end of long extension of reaction time.

Chemically-Induced Graft Copolymerization of Diethylenetriamine onto Bagasse Celluloses

2011 ◽  
Vol 295-297 ◽  
pp. 1494-1498
Author(s):  
Nan Nan Xia ◽  
Hong Xiang Zhu ◽  
Shuang Fei Wang ◽  
Ying Xiao Mu ◽  
Chao Bing Deng ◽  
...  
Keyword(s):  
Reaction Time ◽  
Aqueous Medium ◽  
Reaction Temperature ◽  
Graft Copolymerization ◽  
Optimum Process ◽  
Process Conditions ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Chemically Induced ◽  
Ft Ir

Graft copolymerization of diethylenetriamine onto bagasse celluloses was investigated with ammonium ceric nitrate as initiator in an aqueous medium. The condition of the graft copolymerization initiator concentration, the mass ratio of monomer/cellulose, reaction temperature, reaction time based on the experiment is optimized according to the zeta potential. The results showed the relative optimum process conditions were: the concentration of initiator at 36.98mmol/L, the mass ratio of the monomer and cellulose at 1:1, the reaction temperature at 70°C, and the reaction time by 3h. In addition, the graft copolymers were characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction analysis (XRD). The results showed that bagasse celluloses could be grafted with diethylenetriamine in aqueous medium.

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