Effect of hydrogen peroxide on the polymerization and UCST (upper critical solution temperature) behavior of PMMA

Title
Effect of hydrogen peroxide on the polymerization and UCST (upper critical solution temperature) behavior of PMMA
Authors
방종곤
Keywords
effectofhydrogenperoxideonthepolymerizationanducstuppercriticalsolutiontemperaturebehaviorofpmma
Issue Date
2012
Publisher
인하대학교
Abstract
The effect of hydrogen peroxide on the molecular weight of PMMA in the modified dispersion polymerization and reversible temperature responsive behavior upon heating and cooling processes was studied. The variables were the molecular weight upon the concentration of initiator and hydrogen peroxide, solubility upon molecular weight and temperature, particle size upon cooling rate, and reversible temperature responsive behavior upon thermal history. The PMMA spherical particles were synthesized in the modified dispersion polymerization using a co-solvent of methanol/water and methanol/hydrogen peroxide aqueous solution. As a result, hydrogen peroxide was confirmed to act as a co-initiator in reducing the molecular weight of PMMA, a good co-solvent with methanol by improving the solubility and inducing the UCST behavior, a stabilizer in forming stable particles upon cooling.
Description
Chapter 1. INTRODUCTION. 1 Chapter 2. THEORITICAL BACKGROUND 3 2.1 Free-radical Polymerization 3 2.1.1 Introduction. 3 2.1.2 Chain Polymerization. 3 2.1.3 Chemistry of Free-radical Polymerization. 4 2.1.4 Stereochemistry of Polymerization 14 2.1.5 Heterogeneous Polymerization 18 2.2 Hydrogen peroxide. 21 2.2.1 Introduction 21 2.2.2 Hydrogen peroxide as a source of free radicals. 22 2.3 Thermal/temperature responsive polymer. 23 2.3.1 Introduction 23 2.3.2 Technology and application of TRPs. 24 2.3.3 Polynipaam 33 2.4 Phase separation theory. 38 2.4.1 Phase separation and fractionation 38 2.4.2 Region of the polymer-solvent phase diagram 40 2.4.3 Kinetics of phase separation 42 2.4.4 Solubility 43 Chapter 3. EXPERIMENTAL 47 3.1 Chemicals. 47 3.2 Polymerizations. 47 3.3 Characterization. 48 Chapter 4. RESULT AND DISCUSSION 49 4.1 Effect of hydrogen peroxide on polymerization 49 4.2 Effect of molecular weight 53 4.3 Effect of monomer. 53 4.4 Effect of solvent. 53 4.4 Effect of hydrogen peroxide on UCST behavior. 53 Chapter 5. CONCLUSIONS. 79 Chapter 6. REFERENCES. 80
URI
http://dspace.inha.ac.kr/handle/10505/23699
Appears in Collections:
College of Engineering(공과대학) > Chemical Engineering (화학공학) > Theses(화학공학 석박사 학위논문)
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