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Li Q.,Shandong University | Gao C.,Shandong University | Cheng Z.,Shandong Taihe Water Treatment Co.
Journal of Polymer Materials | Year: 2014

In order to synthesize a series of temperature sensitive hydrogels, the N-tert-butylacrylamide (NTBA) and acrylamide (AAm) were selected as the comonomers and polymerized by free-radical copolymerizarion. Poly (NTBA-co-AAm)/silica (STA) composite hydrogels with prescribed feed composition of NTBA and AAm (50:50 mol%) were prepared by incorporating spherical silica particles (100μm) as the pore-forming agents. Scanning electron microscopy (SEM) was used for revealing the porous structure of hydrogels. The STA hydrogels exhibited a much faster response than hydrogels without Silica (TA) during swelling and deswelling processes. Particularly, the macroporous structure of STA hydrogels can greatly improve the shrinking rate of deswelling process. The pulsatile swelling-deswelling cycles were repeatable with excellent reproducibility. Such STA hydrogels may be used as a support for controlled release of macromolecular agents. © Prints Publications Pvt Ltd. Source

Li Q.,Shandong University | Gao C.,Shandong University | Cheng Z.,Shandong Taihe Water Treatment Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2015

Temperature-sensitive poly(N-tert-butylacrylamide-co-acrylamide)[P(NTBA-co-AAm)] linear copolymer and hydrogels were prepared by radical polymerization with N-tert-butylacrylamide (NTBA) and acrylamide (AAm) as comonomer, ammon ium persulfate (APS) and N', N-methylenebisacrylamide (MBA) as initiator and crosslinking agent respectively. In order to improve the swelling properties of hydrogels, a series of macroporous hydrogels were synthesized using silica particles and PEG400 as pore-forming agent. The thermal properties of P(NTBA-co-AAm) linear copolymers were evaluated by utilizing differential scanning calorimeter (DSC). The structures of hydrogels were characterized by FT-IR. The surface and interior morphologies were observed by SEM. The influences of n(NtBA)/n(AAm), the amount of MBA and reaction temperature on the swelling properties of hydrogels were also studied. From the results of the experiments, it is found that an increase of n(NtBA)/n(AAm) in feed cause decrease of transition temperature of linear copolymers and hydrogels; the swelling ratios of hydrogels decreases with increase of the MBA concentration; the macroporous P(NTBA-co-AAm) hydrogels exhibit faster response rate to temperature changes and higher swelling-deswelling properties compared with traditional hydrogels. ©, 2015, Chengdu University of Science and Technology. All right reserved. Source

He M.-C.,Shandong Taihe Water Treatment Co. | Sun Q.-F.,Shandong Taihe Water Treatment Co. | Tian Z.-W.,Shandong Taihe Water Treatment Co. | Liu J.,Shandong Taihe Water Treatment Co. | Gao C.-Z.,Shandong University
Xiandai Huagong/Modern Chemical Industry | Year: 2012

Due to the serious scaling problem in oil fields, especially strontium and barium scaling, a new type of barium and strontium scale inhibitor TH-607B for oil fields is developed. TH-607B is compared with several conventional scale inhibitors used in oil field. Inhibition scale performance of TH-607B and several scale inhibitors for calcium carbonate, calcium sulfate, barium sulfate and strontium sulfate is studied. The inhibition efficiency is measured according to Trade Standard SY/T 5673-1993. The factors affecting the inhibiting rate of barium sulfate and strontium sulfate are studied. The experimental results demonstrate that TH-607B has good inhibition scale effect on barium sulfate and strontium sulfate under high temperature, high salts, high pH or low pH conditions. It will have extensive application because of its good performance in circumstance of high temperature, high salts and wide pH range. The practical application of TH-607B oil fields indicates that TH-607B has good inhibition scale and corrosion effect. The scale inhibiting rate can be over 90%. Source

Liang Z.,Shandong University | Li Q.,Shandong University | Gao C.,Shandong University | Cheng Z.,Shandong Taihe Water Treatment Co. | Qi X.,Shandong Taihe Water Treatment Co.
Desalination and Water Treatment | Year: 2016

In this article, a simple and sensitive spectrometric method used for determination of polyepoxysuccinic acid (PESA) in circulating water was investigated. The availability of this method depends on the turbidity formed by PESA and dodecyl dimethyl benzyl ammonium chloride (1,227). In order to obtain the optimal experimental conditions, influencing factors such as dosage of 1,227, pH value, and stabilization time were discussed. Interferences of coexisting substances which may hamper the determination of PESA were also studied. The optimal experimental conditions were as follows: 1,227 concentration of 250 mg L−1, pH range of 9–10, and stabilization time of 30 min. Under these conditions, a better linear relationship between absorbance and concentration was observed within a PESA concentration range of 0–16 mg L−1. It was also demonstrated that foreign ions (i.e. (Formula presented.) , (Formula presented.) , Cl−, Fe2+) and water quality stabilizers (i.e. 1,2,3-benzotriazole and 1-hydroxy ethylidene-1, 1-diphosphonic acid) had no influences on the determination. In addition, interferences of Ca2+ and Mg2+ can be eliminated by adding a desired amount of ethylenediamine tetraacetic acid disodium salt. To minimize the influence of sodium hexametaphosphate, a proper amount of HCl was added into the solution, and then it was boiled after mixing. In summary, this method is very simple, concise, and accurate with a lower detection limit, which could provide a theoretical and practical guidance for the determination of PESA. © 2015 Balaban Desalination Publications. All rights reserved. Source

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