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Preparation Of Quaternary Copolymer Superabsorbent And Thermal Decomposition Kinetic Analysis

Posted on:2015-08-07Degree:MasterType:Thesis
Country:ChinaCandidate:P P BeiFull Text:PDF
GTID:2181330431991402Subject:Applied Chemistry
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Superabsorbent can absorb a large amount of water and water is hardly removed as a new polymeric materials, it has been widely used in many aspects such as physio-logical, medicine and agriculture.Superabsorbent was synthesized by via ultraviolet irradiation without initiator and nitrogen atmosphere using N,Nā€™-methylene Bisacrylmide (NMBA) ascross linking agent,2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA), acrylamide (AM), CTS as the monomer. The best reaction condition was based on the orthogonal experiment design the influences of reaction conditions on water absorbency were investigated. The results show that n(AMPS):n(AA):n(AM)=1:2:0.5,1%CTS,0.3%NMBA, pH was2.8, the curing time was8min, the content was9.68%and the absorping power of resin was780g/g for distilled water under the optimum condition.Absorbency, salt absorption, the water keeping function of resin were investigated. Superabsorbent was characterized by FT-IR, TQ microscopy and AFM. The results show that the absorping power of resin was740g/g for distilled water, and55g/g for0.1mol/L NaCl solution respectively, the water keeping function is better, its temperature of the thermal decomposition is about254ā„ƒ.The non-isothermal thermal decomposition process of superabsorbent was investigated. TG curves at various heating rates of5态20态35and40K/min were investigated by Thermo Gravimetric Analyzer. Activation energy and mechanism functions of the two stage using the multiple scanning of FWO and Coats-Redfern method were analyzed. The results show that activation energy of the two stage were136.75kJ/mol and193.41kJ/mol, the reaction mechanism of the two stage were two-dimensional diffusion, random nucleation and subsequent growth.
Keywords/Search Tags:superabsorbent, 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, acrylamide, CTS, ultraviolet irradiation, non-isothermal decomposition kinetics, reaction mechanism
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