Synthesis and characterization of a novel terpolymer and the effect of its amphoteric property on the sludge flocculation

An amphoteric polymer, poly(acrylamide‐acryloyloxyethyl trimethyl ammonium chloride‐2‐acrylamido‐2‐methyl‐propane sulfonate) (PADA) was developed for use as a sludge flocculant. It was synthesized in aqueous solution by ternary free radical copolymerization from acrylamide (AM), acryloyloxyethyl tri...

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Bibliographic Details
Published in:Polymer engineering and science 2016-02, Vol.56 (2), p.158-169
Main Authors: Qi, Liang, Cheng, Jian-Hua, Liang, Xiao-Yan, Hu, Yong-You
Format: Article
Language:English
Subjects:
Amphoterics
Analysis
Chemical properties
Chemical synthesis
Chlorides
Flocculating
Infrared spectroscopy
Nuclear magnetic resonance
Optimization
Sludge
Sulfonates
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Summary:An amphoteric polymer, poly(acrylamide‐acryloyloxyethyl trimethyl ammonium chloride‐2‐acrylamido‐2‐methyl‐propane sulfonate) (PADA) was developed for use as a sludge flocculant. It was synthesized in aqueous solution by ternary free radical copolymerization from acrylamide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC) and 2‐acrylamido‐2‐methyl‐propane sulfonate (AMPS) in redox/azo initiation. Single factor experiments and response surface methodology (RSM) were conducted to determine the optimum range of reaction variables and investigate their interactions affecting flocculation capacity of PADA. The minimum predicted response values of specific resistance to filtration (SRF) and content of water(CW) under the optimum conditions were 2.29 × 1013 m/kg and 77.65%, respectively. In order to observe structural characteristics of polymer, Fourier‐transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR) and Thermogravimetric analysis (TGA) were used. Subsequently, the flocculation characteristics of PADA were proposed systemically by contrastive analysis of the polymer morphology, charge effects and floc characterization with control samples to indicate that amphoteric properties of PADA took positive effects on the sludge flocculation. Finally, treatment of sludge confirmed that PADA was a highly efficient flocculant, which was applicable to be used in a wider range conditions. POLYM. ENG. SCI., 56:158–169, 2016. © 2015 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.24238