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Study on Preparation and Properties of High-Strength Polymer Gels

Author: JinGaoJun
Tutor: HuangMei
School: Zhejiang University
Course: Chemical Engineering
Keywords: PAMPS / PAAm hydrogel Ionic liquid gel Interpenetrating network High strength Ionic strength
CLC: O648.17
Type: Master's thesis
Year: 2010
Downloads: 289
Quote: 0
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Abstract

Hydrogel as a soft wet material the many rigid material does not have the deformation and motor performance, such as external stimuli response intelligent features and shape memory characteristics, and thus are in the field of industrial, agricultural, biological and material shows an attractive prospect. However, the weak mechanical strength of the polymer hydrogel, poor stability, slow response and other shortcomings greatly limits its practical application. Therefore, the ionic liquid gel study preparing high strength hydrogels, as well as non-aqueous environment will be very meaningful. By investigating the mechanical properties and swelling characteristics of the different monomer concentrations and ionic strength gel, interpenetrating network of condensate formed on the poly-2 - acrylamido - 2 - methyl propane sulfonic acid (PAMPS) and polyacrylamide (PAAm) high strength properties and mechanism of action of the gum. The results show that: the PAMPS / PAAm interaction increases the mechanical strength of the interpenetrating network hydrogel with AAm concentration is increased, while the AMPS concentration has an optimum value (1 mol / L). 1 mol / L AMPS and 4 mol / L AAm concentration, the synthesis of PAMPS / PAAm the maximum compressive strength of the gel is up to 6.46 MPa. Change the ionic strength of the water within the gel system, 1p2a and 1p4a PAMPS / PAAm gel state of compressive strength with pure water in the ionic strength of 0.25 mol / kg, respectively, compared to an increase of 67% and 29%. Ionic liquid gel combined with the stability of the ionic liquid, non-volatile, good conductivity and gel environment responsive smart features, this article visits vinyl monomers in the imidazole-based ionic liquid solubility and aggregation properties ionic liquid gel preparation method, based on the exploration, successfully prepared PAAm / [BMIm] Br high intensity ion liquid gel and its performance studied. The results show that: the PAAm / [BMIm] Br ionic liquid gel strength with the increase of the concentration of the AAm concentration and cross-linking agent (MBAA) increase in the MBAA content of 1 mol% AAm concentration of 5 mol / L when the maximum resistance of the gel The compressive strength of 30.6MPa. In PAAm / [BMIm] Br ionic liquid gel was added hydroxyethyl methacrylate (HEMA) copolymerized with AAm obtained PAAm-PHEMA / [bmim] Br ionic liquid gel, With HEMA increasing amount of gel The strength is reduced, the increase in flexibility. The PAAm-PHEMA / [BMIm] Br ionic liquid gel conductivity at 25 ℃ to 10 ^{-2 mS / cm. The TGA tests show that the stability of the ionic liquid gel temperatures close to 250 ° C, the ionic liquid content of up to 70%.}

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