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Multivariate acrylic ester polymer foam developed with performance

Author: FanYongHeng
Tutor: ZhangLin
School: Chinese Academy of Engineering Physics
Course: Nuclear Fuel Cycle and Materials
Keywords: Acrylate Solvent effect Sol - gel Bubble Doping
CLC: TL62
Type: Master's thesis
Year: 2004
Downloads: 129
Quote: 0
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Abstract


Multiple acrylate polymer foam laser inertial confinement fusion target material. Papers reported to the lack of systematic in-depth study on the impact of the foam performance factors as the breakthrough point, solubility parameters calculated starting from a simple group, in accordance with the initiator efficiency, solvent effect, trapping of oxygen free radicals (chain disruptions) effect, sol - gel kinetics, gel strength and structure of the relationship between the foam structure, as well as targeted chemical doping prepared the order of the multi-acrylate foam throughout the experiment, a more detailed study and achieved results. These results have important reference value for carry out such experimental study to optimize the technology roadmap, and eventually achieve a low-density foam molding technology in situ. The thesis mainly include four parts: selection of the solvent, the sol - gel process, foam molding properties of doped foam molding and performance studies. Radical solution polymerization reaction system, the solvent exists in the form of the reaction medium, the solvation effect produced by it, a chain transfer effect and the cage effect affecting the activity of the initiator, the polymerization reaction rate and the swelling properties of the polymer, etc.. This paper combines the specific reaction system, is determined through theoretical calculations and experimental determination of the method of combining the solubility parameter value of the pentaerythritol tetraacrylate (PETA) as the polymerizable monomer crosslinked polymer formed in 19.0 near. Benzoin ethyl ether of aliphatic hydrocarbons containing the benzene ring and the carbonyl functional groups of the solvent with the initiator molecule is capable of interacting, resulting initiator \maximize maintain the reactivity of the initiator, the polymerization reaction rate is faster. Found that by changing the ratio of oxygen volume and the volume of solution in the sol - gel process, oxygen inhibition produce an active radical initiator split is the main cause the solvent in the reaction system and the precipitated, and the initiator concentration, the smaller the amount of solvent precipitation. greater. Relative change in viscosity of the polymerization system according to the online monitoring the sol - gel process found: polymerization of the total reaction rate is directly proportional to the monomer concentration, initiator concentration is proportional to the square root of, in the stage of low conversion rate, the monomer concentration on the polymerization rate impact becomes large number of. The mechanical properties and crosslink density of the polymer gel are closely related, and when the cross-linking density increases, the gel strength and modulus of elasticity also increased, the the gel elastic constant decreases. To the the carboxyhemoglobin double bond (C = O) stretching vibration peak as internal standard, on a carbon-carbon double bond (C = C), the infrared spectrum tracking study found: foam theoretical density of less than 50mg/cm ~ 3, the carbon-carbon double key (C = C) conversion rate is influenced by oxygen; while foam density greater than 50mg/cm ~ 3, the conversion rate of the carbon-carbon double bond is less affected by oxygen, and the conversion rate remains substantially in the vicinity of 86%. Successfully prepared using carbon dioxide supercritical drying techniques (controlling the temperature of about 36 ℃, the pressure about 8MPa) multi-acrylate polymer foam. By weighing, after the measurement of volume calculation of the actual density of foam is found that the difference between the actual density and the theoretical density, with the increase in monomer concentration increasingly smaller, indicating that the shrinkage rate of the foam is getting smaller and smaller. Capillary vessel, successfully prepared low density foam 10mg/cm ~ 3. The measurement of gas adsorption method and mercury porosimetry: The results show that the foam density increasing, after rapid growth in the specific surface area, gradually flatten, the mean pore size of the inside of the microgel particles constituting the the foam main skeleton structure is concentrated at 10 nm or less and structural characteristics of these holes with foam density increase changed little, but the aperture between the microgel particles from tens of nanometers to hundreds of microns have, pore size distribution the polyacrylate cool polymer foam Development and performance studies with the foam density increases. Cool reaction of acrylic acid and halogenated phenols the doping modification synthetic acrylic cool monomer (AEI, AEZ, AE :), and combined them with multivariate the acrylic cool monomer (PETA) copolymerization COZ supercritical drying technology to prepare the doped acrylate cool polymeric foam, synthetic yield is above 70%. The study found the AEI, AE: reactive with PETA preferably doped with higher levels of chlorine element, mass percentage content can reach Qiao%.

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CLC: > Industrial Technology > Nuclear technology > Controlled thermonuclear reactions ( fusion reaction theory and experimental facilities) > Fusion engineering and technical
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