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Inverse Microemulsion Polymerization of Methyl Methacrylate

Author: XiaShengPing
Tutor: LiXiao
School: Fuzhou University
Course: Chemical Engineering
Keywords: Microemulsion No soap microemulsion Microemulsion polymerization Dynamics Monitor Porous polymer materials
CLC: TQ316.334
Type: Master's thesis
Year: 2005
Downloads: 398
Quote: 1
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Abstract


The microemulsion is provided by two immiscible liquid formed under the action of the surfactant and cosurfactant thermodynamically stable, isotropic, transparent appearance of the dispersion system, Microemulsion Preparation of porous material is of concern in recent years. This paper investigated on the basis of the the microemulsion properties of methyl methacrylate (MMA), MMA / acrylic acid (AA) / sodium dodecyl sulfate (SDS) / H 2 O system and MMA / AA / H 2 O soap system inverse microemulsion polymerization kinetics of the explore monitoring microemulsion polymerization process, and inverse microemulsion preparation of porous polymer material analysis, specific as follows: (1) by visual and electrical conductivity method draw of MMA / AA / SDS-H 2 O system intends ternary phase diagram and MMA / AA / H of > O ternary phase diagram soap-free system. Conductivity meter, viscometer and a refractometer determined the structural change of the different types of micro-emulsion was found in the fixed MMA / AA monomer mixture the amount of the case, as the water phase content increases, the conductivity of the system, the viscosity and refractive rates change significantly, the system is gradually transformed by the W / O type microemulsion bicontinuous microemulsion by O / W microemulsion. Micro-analysis showed that the size of the emulsion, the oil phase content is low, the droplets of the O / W microemulsion may be regarded as swelling micelles; in W / O type microemulsion, with increasing the content of the aqueous solution of SDS, The droplet size of the water phase significantly increased; MMA/AA/H2O inverting soap microemulsion system, the microemulsion droplets particle size than MMA / AA / SDS / H 2 O inverting System. (2) of MMA / AA / SDS-H 2 O phase diagram studies based on inverse microemulsion polymerization investigated the amount of AIBN initiator azobisisobutyronitrile (AIBN), AA content, SDS aqueous solution content and reaction temperature on the impact of the initial polymerization rate (dC / dt), to obtain the kinetic relationship as follows: dc / dtα [AIBN was] 0.8 [AA] 1.2 [W 1 ] 0.7 and the inverting microemulsion polymerization temperature-sensitive polymerization apparent activation energy for 93.8kJ/mol. (3) in MMA / AA / H 2 O phase diagram based on the soap-free microemulsion polymerization using AIBN initiator inverting investigated the amount of AIBN AA content and water content on the initial rate of polymerization the impact of the dynamic relationship as follows: dC / dtα [AIBN] 1.0 [AA] ) (1.7) which, dC / dtα, and [AIBN] 1.0 single-terminated chain termination process may occupy a large proportion; addition of the water content, as the water content increases, the rate of polymerization there is a great value. (4), respectively, refractometer, conductivity meter and time-resolved laser light scattering instrument monitoring the polymerization process of the microemulsion systems, found that as the microemulsion polymerization reaction proceeds, the system of the refractive index, conductivity, and scattered light The intensity distribution will change accordingly, and these changes may correspond to the microemulsion polymerization

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CLC: > Industrial Technology > Chemical Industry > Molecular compound Industries ( polymer industry ) > Production process > Polymerization process. > By method of sub- > Emulsion polymerization
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