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논문 기본 정보

자료유형
학위논문
저자정보

장한별 (부산대학교, 부산대학교 대학원)

지도교수
김일
발행연도
2020
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부산대학교 논문은 저작권에 의해 보호받습니다.

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The interaction between complexing agent (CA) and the active sites plays a crucial role in the activity of double metal cyanide (DMC) catalyst towards ring-opening polymerization of epoxide. Herein, we have investigated carbonate compounds as CAs for DMC catalyst. The good coordination between the carbonate CAs and Zn sites enables us to simplify the catalyst preparation procedure. The state and location of the CAs within the catalyst matrix were clearly determined using common technique such as infrared, adsorption, and X-ray photoelectron spectroscopies. The catalyst morphology was investigated by X-ray diffraction and scanning electronic microscopy while the catalyst composition was investigated by elemental analysis. DMC catalysts bearing carbonate CAs exhibited high performance in the polymerization of propylene oxide with high polymerization rate (calculated by average polymerization rate in g-PPO g-cat-1h-1.) up to 4272, produced polyols with narrow polydispersity index, low unsaturation level and tunable hydroxyl functionality

목차

LIST OF SCHEME 3
LIST OF TABLE 4
LIST OF FIGURE 6
1. INTRODUCTION 10
2. EXPERIMENTAL 11
2.1. Materials 11
2.2. Preparation of DMC catalyst 12
2.3 DFT calculations 14
2.4. Semi-batch polymerizations of PO 14
2.5. Batch-polymerizations of epoxide monomers 15
2.6. Copolymerization of Polycarbonate polyols 15
2.7. Characterization 16
3. RESULTS AND DISCUSSION 17
3.1 Effect of type of complexing agents on DMC catalysts 17
3.2 Effect of catalytic preparation method on DMC catalysts 20
3.3 Polymerizations of PO 22
3.4 DFT calculations 25
3.5 Polymerizations of other epoxide monomers 28
3.6 Copolymerization of polycarbonate polyols 29
4. CONCLUSIONS 30
5. REFFERENCES 31

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