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The Kinetics Study on Controlled/ "Living" Photopolymerization of n-Butyl Methacrylate in Microemulsion

Author: GuoPeiZuo
Tutor: LiuXiaoZuo
School: Shantou University
Course: Applied Chemistry
Keywords: Controlled / living radical photopolymerization Microemulsion Nitroxides N-butyl methacrylate
CLC: TQ316.334
Type: Master's thesis
Year: 2008
Downloads: 109
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Abstract


In this paper, nitroxides with the hindered amine derivative as a controlling agent, the polymerization method using photoinitiator of n-butyl methacrylate (n-BMA) three types of microemulsions controlled / \study the control mechanism and kinetics of n-BMA microemulsion system controllable photopolymerization, scanning electron microscopy, and the morphology of the polymer product characterization, the main work and conclusions are as follows: (1) visually and conductivity drawn n-BMA/n-butanol / dodecyl sodium sulfate (SDS)-H2O system pseudoternary phase diagram pseudoternary phase diagram n-BMA/n-pentanol / SDS-H2O system, n-BMA / cetyltrimethylammonium bromide the amine (CTAB) / H2O three-component system pseudoternary phase diagram and n-BMA/n-butanol / CTAB-H2O system pseudoternary phase diagram. Conductivity meter, the determination of the structural changes of the different types of microemulsion system the conductivity change dramatically with the increase in the content of the aqueous phase, bicontinuous microemulsion system by the W / O type microemulsion gradually transformed into O / W microemulsion. Microemulsion particle size analysis showed that, before polymerization (monomer droplets), the average particle size after (latex particles) is no different, the system remains stable. (2) For the positive phase of microemulsion system, under ambient conditions, in order to Irgacure184 as a photoinitiator agent of the study results showed that the overall conversion rate of the system is relatively low, and the smaller the molecular weight of the polymer, the molecular weight polydispersity is also more large. It may be that the monomer concentration is too low, the concentration of emulsifier is too high, hindering growth of the chain reaction proceeds, and therefore, whether based on the quaternary system of the SDS as emulsifier or CTAB as the ternary system of the emulsifier, HO-TEMPO regulatory effects of n-BMA is not obvious. SDS is an anionic emulsifier for W / O type n-BMA microemulsion system, under the regulation of HO-TEMPO, improve as the concentration of the monomer, n-BMA, controllable light conversion rate of the polymerization system has improved significantly. At the same time, system conversion versus time curve, kinetic curves meet the linear growth relationship. Molecular weight as the conversion rate increases with increasing polydispersity coefficient fall, the polydispersity coefficient is relatively low, the lowest reached 1.5, reaches a controllable effect. For cationic emulsifiers of CTAB microemulsion systems of n-BMA, to improve monomer content while reducing the amount of the co-emulsifiers, we chose toluene as auxiliary oil phase, so that the monomer concentration of the system reaches 60%. In the TMP / HO-TEMPO = 2.0, TMP situ system photo-oxidation reaction into nitroxides play a collaborative role, and trace oxygen consumption of the system, so we get a good kinetic curves relationship, and the molecular weight of the obtained polymer with the conversion rate of linear growth, the polydispersity results also better (PDI = 1.7 ~ 1.4), and is reduced as the conversion rate increases. Controllable optical n-BMA bicontinuous microemulsion polymerization under the regulation of HO-TEMPO, an anionic emulsifier SDS system, due to the low monomer concentration than reverse microemulsion system conversion rate than W of / O Microemulsion have a certain reduction. Although the system conversion versus time curve, kinetic curves are in line with linear growth relationship. Monomer molecular weight with the increase of the conversion rate was irregular distribution, the polydispersity coefficient is relatively high, the regulation and control of the system ineffective. For cationic emulsifiers CTAB system, the system has been a good kinetic curve relationship, and the molecular weight of the obtained polymer with a conversion rate of linear growth, the polydispersity coefficient also better reach 1.5, the lowest, and as the conversion rate increases reduced. HO-TEMPO regulation effect of n-BMA bicontinuous microemulsion. (3) by means of dynamic light scattering instrument, we carried out before and after the microemulsion polymerization particle size characterization, the results show that the particle size basically remain the same before and after polymerization, and reach the nanometer size. In the the microemulsion stability polymerization based on, with environmental scanning electron microscopy to examine the characteristics of the bicontinuous microemulsions polymer morphology. The results show that: the open-cell polymer bicontinuous 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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