Study on the Synthesis and Properties of Water-Soluble Chitosan Grafted Copolymer

2011 ◽  
Vol 396-398 ◽  
pp. 1480-1485
Author(s):  
Shui Li Lai ◽  
Ning Yang ◽  
Qiang Chai
Keyword(s):  
Light Transmission ◽  
Ammonium Persulfate ◽  
Water Soluble ◽  
Raw Material ◽  
Reaction Conditions ◽  
Grafted Copolymer ◽  
Deacetylation Degree ◽  
Aqueous Solution Polymerization ◽  
Optimum Reaction ◽  
Polymerization Method

Grafted chitosan(CTS) copolymer was synthesized by the aqueous solution polymerization method, using the ammonium persulfate as initiator graft, Acrylamide（AM）and methacrylamide trimethyl Ammonium Chloride (DMC) as the grafted monomer. The effects of reaction conditions on grafted copolymerization were studied. When the deacetylation degree of chitosan as raw material is 86%, the optimum reaction to produce CTS -AM-DMC ternary graft copolymers by first AM and then DMC sequence were obtained at [initiator] 0.08%, 50°Cand 3.5h.The structure of CTS-AM-DMC was characterized by FTIR and XRD. When the dosage of synthetic product is 0.3mg/L, the effect of flocculation on the papermaking wastewater is obvious better, which can make the light transmission up to 99%, and CODCr to 9mg/L.

Synthesis and Application of Starch Modified Flocculant

2013 ◽  
Vol 821-822 ◽  
pp. 1014-1018
Author(s):  
Meng Zheng ◽  
Hong Jun Zhang
Keyword(s):  
Raw Material ◽  
Solution Polymerization ◽  
Optimum Conditions ◽  
Cationic Starch ◽  
Reaction Conditions ◽  
Treatment Performance ◽  
Methylation Reaction ◽  
Aqueous Solution Polymerization ◽  
Optimum Reaction ◽  
Oil Wastewater

Starch (St) and acrylamide (AM) copolymers was prepared by aqueous solution polymerization, which as raw material finished hydroxyl methylation reaction, then condensation dehydration with dicyanodiamine, cationic starch graft flocculant is synthetized. Hydroxyl methylation reaction optimum conditions are: temperature T=50°C; pH=10; n (HCHO) : n (St-AM)=1.1:1; reaction time t=2h; Dehydration optimum reaction conditions: mole ratio of 1:1; pH = 4; t=3 h; temperature T=45°C. Intrinsic viscosity number of product is 1023 ml/g, cationizing degree is 50%. Treatment performance for oil wastewater is investigated by using cationic starch graft flocculant compound with the inorganic polymeric coagulant polyferric chloride, the experimental results show that: in wastewater pH=7, the amount of inorganic polymeric coagulant polyferric chloride is 2000 mg/L, the amount of starch graft flocculant is 500 mg/L, the treatment effect is the best, oil content and suspension content are less than 10 mg/L, which reach Daqing oilfield re-injection standard.

scholarly journals Determination of Nickel in End-Fitting of Spoolable Reinforced Plastic Line Pipe

2018 ◽  
Vol 142 ◽  
pp. 01002
Author(s):  
Xiaodong Shao
Keyword(s):  
Ammonium Persulfate ◽  
Reaction Conditions ◽  
Line Pipe ◽  
Acid Gas ◽  
Determination Of Nickel ◽  
Reinforced Plastic ◽  
Relative Standard ◽  
Optimum Reaction ◽  
Fitting In

Spoolable reinforced plastic line pipe will be widely used in the exploitation of acid gas and oil wells. End-fitting is a mechanical device that forms the transition from the spoolable reinforced plastic line pipe to the connector. It was well known that nickel was an important element in the end-fitting. In this paper, a novel spectrophotometric method was described for determination of nickel in the end-fitting of spoolable reinforced plastic line pipe. The method was based on the color reaction between nickel and dimethylglyoxime, which was favored in an alkaline medium, producing a red compound in the presence of ammonium persulfate as an oxidant. Under the optimum reaction conditions the absorption value was proportional to the concentration of nickel in the range of 0.080~0.50% (R2 = 0.9999), and the relative standard deviation was less than 3.0% (n=5). The proposed method was applied successfully to determine nickel in end-fitting of spoolable reinforced plastic line pipe.

scholarly journals New Grafted Copolymers Carrying Betaine Units Based on Gellan and N-Vinylimidazole as Precursors for Design of Drug Delivery Systems

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5451
Author(s):  
Stefania Racovita ◽  
Nicolae Baranov ◽  
Ana Maria Macsim ◽  
Catalina Lionte ◽  
Corina Cheptea ◽  
...  
Keyword(s):  
Graft Copolymerization ◽  
Polymer Concentration ◽  
Monomer Concentration ◽  
Ammonium Persulfate ◽  
Nitrogen Atmosphere ◽  
Sustained Drug Release ◽  
Reaction Conditions ◽  
Grafted Polymer ◽  
Grafted Copolymer ◽  
Grafting Reaction

New grafted copolymers possessing structural units of 1-vinyl-3-(1-carboxymethyl) imidazolium betaine were obtained by graft copolymerization of N-vinylimidazole onto gellan gum followed by the polymer-analogous reactions on grafted polymer with the highest grafting percentage using sodium chloroacetate as the betainization agent. The grafted copolymers were prepared using ammonium persulfate/N,N,N′,N′ tetramethylethylenediamine in a nitrogen atmosphere. The grafting reaction conditions were optimized by changing one of the following reaction parameters: initiator concentration, monomer concentration, polymer concentration, reaction time or temperature, while the other parameters remained constant. The highest grafting yield was obtained under the following reaction conditions: ci = 0.08 mol/L, cm = 0.8 mol/L, cp = 8 g/L, tr = 4 h and T = 50 °C. The kinetics of the graft copolymerization of N-vinylimidazole onto gellan was discussed and a suitable reaction mechanism was proposed. The evidence of the grafting reaction was confirmed through FTIR spectroscopy, X-ray diffraction, 1H-NMR spectroscopy and scanning electron microscopy. The grafted copolymer with betaine structure was obtained by a nucleophilic substitution reaction where the betainization agent was sodium chloroacetate. Preliminary results prove the ability of the grafted copolymers to bind amphoteric drugs (cefotaxime) and, therefore, the possibility of developing the new sustained drug release systems.

Synthesis of Diamine Containing Chalcone Structure by Nitroammoniation and Aldol Condensation

2019 ◽  
Vol 801 ◽  
pp. 145-150
Author(s):  
Yan Kai Huang ◽  
Qi Lin Mei ◽  
Zhi Xiong Huang ◽  
Yan Qin ◽  
Di Zhu
Keyword(s):  
Reaction Temperature ◽  
Elemental Analysis ◽  
Aldol Condensation ◽  
Raw Material ◽  
Anhydrous Ethanol ◽  
Infrared Analysis ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Ethanol Dosage

In this paper, the structure of the photosensitive diamines was designed and the method of synthesizing such diamines was investigated. The 1-(3-aminophenyl)-3-(4-aminophenyl)-2-propen-1-one analyzed by elemental analysis and infrared analysis was synthesized through two-step experiments with Aldol condensation and Nitroammoniation process. Through the experiment the optimum reaction conditions are raw material ratio of 1:1, anhydrous ethanol dosage of 60 ml, 10 % NaOH dosage of 10 ml and reaction temperature of 25°C for 4h. The yield was about 55.4 %.

Preparation and Properties of MgAl2O4-CaAl12O19 High Temperature Composite

2012 ◽  
Vol 512-515 ◽  
pp. 617-620
Author(s):  
Yong Hong Wang ◽  
Yan Gai Liu ◽  
Tao Yang ◽  
Zhao Hui Huang ◽  
Ming Hao Fang
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Reaction Temperature ◽  
Bending Strength ◽  
Raw Materials ◽  
Weight Ratio ◽  
Raw Material ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Industrial Alumina

The utilization of lightweight refractories plays an important role in reducing the energy consumption of industrial furnaces. In this paper, MgAl2O4-CaA112O19 high temperature composite was synthesized via solid state reaction using magnesite, dolomite and industrial alumina as raw materials. The influences of raw materials and reaction temperature on phase compositions and microstructure of the composite were investigated by XRD and SEM，respectively. The parameters to prepare MgAl2O4-CaA112O19 high temperature composite were optimized. The results show that the optimum reaction conditions for synthesizing MgAl2O4-CaA112O19 composite is the CA6/MA weight ratio of 2:3, and the reaction temperature of 1500°C for 4h. The CaA112O19 crystals showed laminated or plate-like structure, and the MgAl2O4 showed spherical morphology. The reaction temperature had little effect on the phase compositions of MA-CA6 composite in this experiment. The content of Al2O3 in the raw material affected the phase composition of MA-CA6 composite.With the increase of the CaA112O19 amount, the bending strength of the composite decreased.

Preparation of Poly (MMA-S-DVB) Microspheres by Suspension Polymerization Method

2013 ◽  
Vol 745-746 ◽  
pp. 53-59 ◽  
Author(s):  
Si Qun Chen ◽  
Zi Cai Sun ◽  
Xiao Wei Wang ◽  
Xiao Hui Chen ◽  
Jian Jun Chen
Keyword(s):  
Suspension Polymerization ◽  
Absorption Analysis ◽  
Mass Ratio ◽  
Macroporous Resin ◽  
Reaction Conditions ◽  
Divinyl Benzene ◽  
Optimum Reaction ◽  
Ft Ir ◽  
Oil Water ◽  
Polymerization Method

In this work, Poly (methy methacrylate-styrene-divinyl benzene) (MMA-S-DVB) microspheres were prepared by suspension polymerization approach in the presence of n-dodecane as porogenic agent. Various types of measurements,such as binocular biological microscope with micrometer, fourier transform infrared (FT-IR) and N2 absorption analysis (BET) were conducted to characterize the MMA-S-DVB microspheres. The effect of the amount of surfactants (PVA and NaCl), porogenic agent and crossing agent (DVB) on the morphology of microspheres was investigated and mass ratio of oil/water and the stirring speed were also discussed. Finally, according to the experimental results,the optimum experimental condition was obtained as follow: the mass ratio of S:MMA:DVB=3:3:4, the concentration of PVA in the water phase is 2.2 wt %, the concentration of NaCl is 5 wt %, the mass ratio of oil/water is 1:11, the stirring speed is 500rpm.Via controlling the optimum reaction conditions of the suspension polymerization, the crosslinked macroporous resin polymer MMA-S-DVB microspheres with excellent sphericity and controllable diameter in a range of 200~400 μm can be gained.

Superabsorbent Hydrogel from Sago Starch: The Effects of Crosslinking Agent on Thermal Stability and FTIR Analysis

2012 ◽  
Vol 567 ◽  
pp. 174-177
Author(s):  
O. Nurizan ◽  
A. Zuraida ◽  
N. Norhuda Hidayah
Keyword(s):  
Thermal Stability ◽  
Crosslinking Agent ◽  
Ammonium Persulfate ◽  
Sago Starch ◽  
Superabsorbent Hydrogel ◽  
Polymer Hydrogels ◽  
Grafted Copolymer ◽  
Redox Initiator ◽  
Initiator System ◽  
Polymerization Method

For several decades, superabsorbent polymer hydrogels had attracted the researchers’ attention due to its afforded unique environmental and commercial advantages. This paper reported the study on the effect of cross linker on the sago starch superabsorbent hydrogel (SSH), prepared via graft co-polymerization method of acrylic acid (AA) onto sago starch (SS). The AA grafted copolymer was obtained via a redox initiator system of ammonium persulfate (APS) and in the presence of N, N’ - methylenebisacrylamide (N-MBA) crosslinker. Fourier Transform infrared spectroscopy (FTIR) spectra proved that AA was grafted onto SS. The thermal stability of SSH is increases with the addition of crosslinker.

Preparation and Sizing Performance of the Modified Collagen Surface Sizing Agent

2012 ◽  
Vol 271-272 ◽  
pp. 367-371 ◽  
Author(s):  
Xue Chuan Wang ◽  
Xiao Li Hao ◽  
Tao Tao Qiang
Keyword(s):  
Size Distribution ◽  
Ammonium Persulfate ◽  
Raw Material ◽  
Vinyl Monomers ◽  
Grafting Reaction ◽  
Base Paper ◽  
Surface Sizing ◽  
Ft Ir ◽  
Average Size ◽  
Polymerization Method

Using collagen as the raw material, methyl acrylate and vinyl acetate as the soft and hard monomers, ammonium persulfate as the initiator, a surface sizing agent was prepared by the emulsion polymerization method to modified the collagen. The optimum prepared conditions were got by the single factor experiment, follow as m(soft monomer)/m(hard monomer) for 1:2 or 1:1, m(collagen)/m(monomer) for 1:2, the dosage of initiator for 0.8% of monomers amount, the reaction time for 2h. The FT-IR showed that the grafting reaction between vinyl monomers and collagen happened and the vinyl monomers reacted completely. The particle size distribution of the emulsion indicated that its size distribution was uniform and the average size was 0.117μm. The results of application experiments showed that the tensile strength and tearing strength of paper were stronger than that of base paper for 3 times and 1.9 times, after sizing by using the emulsion. The water-resistance of paper was also improved.

Preparation and Electrospinning of Acidified-Oxidized Potato Starch

2012 ◽  
Vol 535-537 ◽  
pp. 2340-2344 ◽  
Author(s):  
Hong Jie Wang ◽  
Xin Jin ◽  
Wen Yu Wang ◽  
Chang Fa Xiao ◽  
Lin Tong
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Optimum Condition ◽  
Potato Starch ◽  
Ammonium Persulfate ◽  
Modified Starch ◽  
Oxidizing Agent ◽  
Reaction Conditions ◽  
Native Starch ◽  
Optimum Reaction

This paper investigates the preparation and electrospinning of acidified-oxidized potato starch. In this article, acidified-oxidized potato starch was prepared by adding ammonium persulfate as an oxidizing agent and hydrochloric acid as a catalyst. The effect of reaction time, temperature, the concentration of hydrochloric acid and the content of ammonium persulfate on the viscosity and content of carboxyl were discussed. The optimum reaction conditions were as follows: 1.5 hours ,50°C, 0.5mol/l HCl, 2.5% (NH4)2S2O8. And then, the acidified-oxidized potato starch prepared at the optimum condition was dissolved in dimethyl sulfoxide (DMSO) to be electrospinned by contrast to native starch. Electrospinning of 5wt%-21wt% of modified starch in DMSO produced beads, beaded fibers, and smooth fibers, depending on the concentration range. Smooth fibers were observed until the concentration reached 19wt%, while native starch was 5wt%.

Preparation of Terephthalic Acid (TPA) and Dioctyl Terephthalate (DOTP) by Anthracite's Alkali Oxygen Oxidation

2014 ◽  
Vol 541-542 ◽  
pp. 95-99
Author(s):  
Kun Du ◽  
Ming Lei Lian ◽  
Zhi Fang Fan ◽  
Yu Li
Keyword(s):  
Aqueous Solution ◽  
Terephthalic Acid ◽  
Potassium Hydroxide ◽  
Water Soluble ◽  
Reaction Conditions ◽  
H Nmr ◽  
Optimum Reaction ◽  
Final Yield ◽  
Ft Ir ◽  
Oxygen Oxidation

TPA was synthesized by a two step reaction. Firstly, water-soluble coal acids (CA) was obtained by oxygen-oxidation at 260°C in all aqueous solution of potassium hydroxide, and then crud TPA was got by isomerization of the CA with the existence of CdCO3 catalyst and CO2 pressure. The optimum reaction conditions to get crude TPA were 4% amount of CdCO3 catalyst, and reacted at 420°C with initial 3.0MPa CO2 pressure. Pure TPA was obtained by a separation step and the yield of pure TPA is 37.16% (based on CA). Furthermore, DOTP was synthesized by the refined TPA and isooctanol. The influence of mole ratio of TPA and isooctanol, amount of catalyst and reaction time on the final yield of DOTP were discussed. The purity of TPA was detected by HPLC and DOTP was detected by FT-IR, 1H-NMR to get confirmatory results.

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