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Synthesis and Properties of Pyrrolidone Hydrophobically Associating Water-soluble Copolymer

Author: ZhangZuo
Tutor: PeiMeiShan
School: Nanjing University of Technology
Course: Applied Chemistry
Keywords: Hydrophobically Associating Polymer Hydrophobic monomer N- vinyl pyrrolidone The performance of the solution Temperature and salt resistance
CLC: O633.4
Type: Master's thesis
Year: 2004
Downloads: 189
Quote: 0
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Abstract


In this study, N-vinyl pyrrolidone hydrophilic monomers, hydrophobic acrylic ester monomer, radical micellar copolymerization, synthesis of a new class of hydrophobically associating polymers, the proposed use of hydrophilic monomer N - vinylpyrrolidone in the five-membered ring side groups with steric resistance, improve the rigidity of the molecular chain, hydrophobic associating polymer synthesis compared to synthetic hydrophilic monomer acrylamide as hydrophobic associating polymer has better salt heat resistance. Hydrophobic associating polymer molecular structure of synthetic acrylic esters, characterized by infrared spectroscopy and elemental analysis, and thermal gravimetric analysis of the thermal properties of the synthesized hydrophobically associating polymers; systematic study of the hydrophobic group type, chain length and content of inorganic salts and surface active agent factors on the synthesis of hydrophobic associating polymer solution properties. Comprehensive analysis of the experimental results, the following conclusions: (1) acrylic acid with higher alcohol esterification reaction the optimal reaction conditions for preparing acrylic acid higher esters of acrylic acid with higher alcohol mole ratio of 1.2:1.0, the mass fraction of the catalyst and the polymerization inhibitor, 1.0% and 0.7%, the highest reaction temperature of 130 ° C, the reaction time was 8h, the yield was up to 97%, the basic esterification reaction to completion. 2 pyrrolidones hydrophobic associative polymer synthesis reaction conditions initiator concentration was 0.4%, reaction temperature is 60 to 70 ° C, the monomer concentration of 15%, the reaction time of 8 hours under the reaction conditions, the yield of the polymer rate and the highest molecular weight. 3 carbon chain length in the carbon chain length of the hydrophobic group hydrophobically associating polymer solution properties of hydrophobically associating polymer hydrophobic and hydrophobic monomers have a close relationship, the longer hydrophobic group segment, the critical association concentration C ~~ the smaller, the greater the magnitude of increase in viscosity, hydrophobic association effect is more obvious. When the hydrophobic alkyl chain length n ≥ 16 hours polyvinylpyrrolidone / acrylic acid ester solution viscosity with increasing concentrations of jumped more significantly, hydrophobically associating a significant effect. Hydrophobic associating polymer hydrophobic monomer content of their solution properties of hydrophobic monomer with the hydrophobic associating polymer content increases, the viscosity of the polymer solution increased significantly, especially in the critical association concentration above when. However, with the hydrophobic monomer content increases, the solubility of the polymer deteriorates, when the sparsely

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Miscellaneous Chain Polymers > Containing two or more different atoms of the polymer chain
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