Synthesis of Low-molecular-weight Poly(propylene carbonate) and CO2-based Silica Nanocomposites
- Alternative Title
- 저분자량의 Poly(propylene carbonate) 합성과 이산화탄소 기반 실리카 나노 컴포지트 에 관한 연구
- Abstract
- 이산화탄소의 화학적 고착은 탄소재료 이용의 관점에서 뿐만 아니라 증가하는 환경문제를 해결하기 위해서도 매우 매력적인 주제다. CO2의 이용은 중요하고 도전적인 과제다. 폴리머 poly(propylene carbonate) (PPC) 는 프로필렌 옥사이드와 이산화탄소를 공중합에 의해 제조된 생분해성 고분자로 CO2의 활용을 시도하였다.
여기 논문에서 DMC촉매에 의한 개환 중합으로 PPC를 제조하였고 원하는 결과물을 얻기 위해 조건을 변경해가며 최적조건을 연구하였다. 고분자의 물성을 향상시키기 위해서, SiO2 nanoparticles에 poly(propylene carbonate-co-propylene oxide) (poly(PC-co-PO) 를 공유결합으로 붙이는 간단한 방법을 개발하였다. 폴리머 매트릭스와 SiO2 nanoparticles를 결합을 통해 열적 특성이 향상됨을 관찰하였다. 또한, 톨루엔 용매하에서 PPC를 grafting한 SiO2 nanoparticles은 nanoparticles의 응집을 막을 수 있었고 분산성을 높일 수 있음을 확인하였다
Chemical fixation of carbon dioxide (CO2) is a very attractive subject not only from viewpoint of carbon resource utilization, but also from increasing environmental concerns. The utilization of CO2 is an important and challenging task. The introduction of CO2 into poly(propylene carbonate) (PPC), a biodegradable polymer prepared by copolymerization of propylene oxide and CO2, is an attempt for CO2 utilization . In this dissertation reported here, the synthesis of PPC via ring-opening polymerization by double metal cyanide (DMC) catalyst was optimized to get desired products. In order to improve the polymer performance, we have developed a CO2 based facile method to prepare covalently anchored SiO2 nanoparticles (SiO2 NPs) with poly(propylene carbonate-co-propylene oxide) (poly(PC-co-PO)). An improved thermal property of the polymer matrix with incorporating SiO2 nanoparticles was observed. Furthermore, the grafting of poly(PC-co-PO) considerably prevented the aggregation and improved the dispersibility of SiO2 nanoparticles in toluene.
- Issued Date
- 2013
- Awarded Date
- 2013. 8
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 대학원
- Department
- 대학원 이미지시스템공학과
- Advisor
- 임권택
- Table Of Contents
- ABSTRACT i
ABSTRACT (KOREAN) ii
LIST OF FIGURES vi
Chapter 1 1
GENERAL INTRODUCTION 1
1.1. Carbon dioxide (CO2) 1
1.1.1. CO2 properties 1
1.1.2. CO2 emission 3
1.1.3. CO2 utilization 4
1.2. Poly(propylene carbonate) (PPC) 7
1.2.1. Catalyst for PPC synthesis 9
1.2.2. PPC composites 12
1.3. Silicon dioxide (SiO2) nanocomposites 13
1.4. Aim and outline of this thesis 15
1.5. References 15
Chapter 2 19
SYNTHESIS OF LOW-MOLECULAR-WEIGHT POLY(PROPYLENE OXIDE-co-PROPYLENE CARBONATE) TOWARD CO2 SURFACTANT APPLICATION BY DOUBLE METAL CYANIDE CATALYST 19
2.1. Introduction 20
2.2. Experimental section 23
2.2.1. Materials 23
2.2.2. Preparation of Zn–Co DMC catalyst 23
2.2.3. Copolymerization of PO and CO2 24
2.2.4. CO2 solubility test 24
2.2.5. Characterization 25
2.3. Results and discussion 25
2.3.1. Catalyst characterization 25
2.3.2. CO2/PO copolymerization using Zn-Co DMC catalyst 28
2.3.3. Structure characterization of poly(PO-co-PC) copolymer 29
2.3.4. The solubility of poly(PO-co-PC) copolymer in CO2. 31
2.4. Conclusion 32
2.5. References 32
Chapter 3 34
COVALENT INCORPORATION OF SIO2 NANOPARTICLES IN CO2-BASED COPOLYMERS: SYNTHESIS, CHARACTERIZATION, MORPHOLOGY AND PROPERTY STUDIES 34
3.1. Introduction 35
3.2. Experimental section 36
3.2.1. Materials 36
3.2.2. Preparation of Zn–Co DMC catalyst 37
3.2.3. Synthesis of poly(PC-co-PO) 37
3.2.4. Preparation of SiO2 nanoparticles (NPs) 37
3.2.5. Preparation of poly(PC-co-PO)-g-SiO2 nanocomposites 38
3.2.6. Characterization and Instruments 38
3.3. Results and discussion 39
3.3.1. Structural characterization 39
3.3.2. Morphological characterizations 40
3.3.3. Dispersion in toluene 41
3.3.4. Thermal properties 41
3.4. Conclusion 43
3.5. References 44
ACKNOWLEDGEMENTS 46
- Degree
- Master
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