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Title Page

Abstract

Contents

I. INTRODUCTION 11

1.1. Importance of Coating Process 11

1.1.1. Coating in Our Lives 11

1.1.2. Controlling Parameters in the Wet Coating 12

1.2. Polymer Nanocomposites as Coating Material 13

1.2.1. Definition and Property of Polymer Nanocomposites 13

1.2.2. Model System using Polymer Nanocomposites as Coating Material 13

II. EXPERIMENTAL METHOD & MATERIALS 15

2.1. Sample Preparation 15

2.2. Experimental Procedures 15

2.3. Small-Angle X-ray Scattering (SAXS) Measurements 16

2.4. Rheological Measurements 16

2.5. Zeta Potential 17

2.6. Preparation of Silica-PEG Film 17

III. Results and Discussion 18

3.1. Initial Dispersion State Effect of Mixture System 18

3.1.1. Ensemble-averaged Structure of Silica Nanoparticles in Polymer Solution 18

3.1.2. Shear Viscosity of Silica Nanoparticles in Polymer Solution 20

3.1.3. Total Pairwise Interaction Potentials of Mixture in PEG 0.4k solution 22

3.2. Structure and Rheological Property of Silica PNC in the Bulk System 24

3.2.1. Ensemble-averaged Structure of Silica PNCs 24

3.2.2. Shear Modulus of Silica PNCs 26

3.3. Structure of Silica PNC in the Film System 28

IV. Conclusion 30

4.1. Initial Dispersion State Effect on the Silica PNC in the Bulk System 30

4.2. Initial Dispersion State Effect on the Silica PNC in the Film System 30

References 31

List of Figures

Figure 1. Slot die process used for electrode slurry application 11

Figure 2. Lithium-ion battery systems and technology 12

Figure 3. Schematic images of silica NPs and PEG 13

Figure 4. (a, b) Five concentrations were chosen to imitate the drying process. Each color represents its... 16

Figure 5. Experimental scattering intensity, I(q), of silica NPs in PEG 0.4k matrix dissolved in water.... 18

Figure 6. Experimental scattering intensity, I(q), of silica NPs in PEG 10k matrix dissolved in water.... 19

Figure 7. Flow curve of particle solution in PEG 0.4k matrix. Different storage time (a) 1 week (b) 4... 20

Figure 8. Flow curve of particle solution in PEG 10k matrix. The viscosity of the 5th concentration in... 21

Figure 9. Total pairwise interaction potentials of silica-PEG mixtures in PEG 0.4k solution at (a) 2nd... 22

Figure 10. Schematic image of silica-PEG mixture system. 23

Figure 11. Experimental scattering intensity, I(qD), of silica NPs in PEG 0.4k matrix. The wavevector,... 24

Figure 12. Experimental scattering intensity, I(qD), of silica NPs in PEG 10k matrix. The wavevector,... 25

Figure 13. Strain sweep experiments for the viscoelastic properties of PNCs in PEG 0.4k matrix at a... 26

Figure 14. Strain sweep experiments for the viscoelastic properties of PNCs in PEG 10k matrix at a... 27

Figure 15. SEM images of silica PNCs at (a) 2nd concentration and (b) 4th concentration in the PEG... 28

Figure 16. Experimental scattering intensity, I(q), of silica NPs in PEG 0.4k matrix. Two concentrations... 29

초록보기

In the colloids-polymer mixture system, the microstructure of particles and polymers are strongly dependent upon their interactions, which can vary systemically with the component concentrations. When the colloidal system is concentrated by solvent evaporation with drying, the continuous change of component concentrations also causes a continuous change in the interparticle interaction. Previous studies have focused on controlling the rate of evaporation or drying conditions of solutions to change the structure of polymer nanocomposite (PNC). In this study, we show how the initial dispersion of the colloidal system can influence the final structure and property of the PNCs. To vary the initial dispersion state, we first set different initial dispersion concentrations to find the effect of polymer and particle volume fractions on the interaction. We observed that a certain concentration range exhibited a stronger attraction due to the depletion attraction. Large clusters induced by a depletion attraction cause a shear-thinning behavior in viscosity. Second, we provide different storage time for particles to be aggregated. The longer for storage time, the higher the viscosity of the colloidal system.

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