다양한 라디칼 중합에 영향을 끼치는 reverse iodine transfer polymerization (RITP) 기술의 영향

Title
다양한 라디칼 중합에 영향을 끼치는 reverse iodine transfer polymerization (RITP) 기술의 영향
Authors
김기정
Keywords
다양한라디칼중합에영향을끼치는reverseiodinetransferpolymerizationritp기술의영향
Issue Date
2012
Publisher
인하대학교
Abstract
The homogeneity in the aqueous methanol mixtures with monomer was verified to be one of the critical factors in determining the polymerization modes between the soap-free emulsion and dispersion polymerization A reverse iodine transfer polymerization (RITP) technical was applied to the various radical polymerization processes. The spherical polystyrene (PS) particles which show various molecular weight and particle sizes were successfully prepared by the suspension, soap free emulsion, and dispersion polymerization using the RITP technique. The molecular weight of polymers was measured by the gel permeation chromatography (GPC), and the particle size and its distribution were observed using the scanning electron microscope (SEM) and particle size analyzer (PSA). As a result, it was verified that iodine concentration strongly influenced to reduce the molecular weight and lower the monomer conversion, but increase the particle size in the applied radical methods. This was due to the reduced polymerization rate upon the inhibition or retardation periods in the RITP technique. In order to overcome the drawback of the RITP technique, the optimum conditions for obtaining the targeted properties of PS were studied based on the concentration of initiator, iodine and solid content. In addition, the solid contents in the RITP-various radical polymerizations also influenced to the molecular weight, particle size distribution and the conversion. Thus, molecular iodine was confirmed to act as a chain transfer agent in the RITP-various radical polymerizations. Furthermore, the verification of the relationship between the particle morphology and molecular weight of the crosslinked PMMA particles prepared using the RITP technique was studied and the mechanism of the formation of surface morphology was proposed.
Description
1. INTRODUCTION 1 2. THEORITICAL BACKGROUND 9 2.1. Free-radical polymerization 9 2.1.1. Introduction of free radical polymerization 9 2.1.2. Chain polymerization 10 2.1.3. Chemistry of free-radical polymerization 11 2.1.4. Stereochemistry of polymerization 24 2.1.5. Crosslinking and curing 28 2.2. Chain transfer methods 39 2.2.1. Traditional methods of chain transfer 39 2.2.2. The catalytic chain transfer process 48 2.2.3. The addition-fragmentation chain transfer process 51 2.2.4. The reversible addition-fragmentation chain transfer 54 2.3. Reverse iodine transfer polymerization (RITP) 67 2.3.1. Introduction of the RITP 67 2.3.2. Mechanism of the RITP 69 2.3.3. Inhibition period in the RITP 71 2.3.4. Polymerization period in the RITP 73 2.4. Heterogeneous system 78 2.4.1. Basic principles 78 2.4.2. Suspension polymerization 82 2.4.3. Macro emulsion polymerization 84 2.4.4. Mini-and micro emulsion polymerization 94 2.4.5. Dispersion polym
URI
http://dspace.inha.ac.kr/handle/10505/23689
Appears in Collections:
College of Engineering(공과대학) > Chemical Engineering (화학공학) > Theses(화학공학 석박사 학위논문)
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