Crystal Modification and Crystallization Kinetics of PVDF Th
发布时间：2021-11-28 17:45
本文利用双亲性离子液体1-十六烷基-3-甲基咪唑盐（IL）和经IL改性后的具有不同长径比的碳纳米管（IL/MWCNT）,通过溶液共混的方式,分别制备了PVDF共混物和纳米复合材料,同时利用FESEM, FTIR-ATR,XRD,POM, DMA, DSC等设备对上述共混物和纳米复合材料进行表征,并测试其物理机械性能。本文的研究重点为了解长烷基链离子液体和IL/MWCNT对PVDF结晶性能的影响,以及该影响对制备的共混物和纳米复合材料的作用。本文研究了IL对PVDF共混物体系结晶性能、晶体结构、球晶增长速率和球晶形态的影响,研究表明,PVDF的结晶行为随着IL添加量的变化表现出不同的状态,当IL添加量为1%时,IL在PVDF共混体系中可以视为软质成核剂,促进体系的结晶,但是当其添加量>1%时,IL的增塑作用比较明显,造成上述结晶性能变化的原因为,在较高的温度下IL可以形成一种反胶束,该反胶束可以促进PVDF生成β/γ结晶。同时通过POM观察没有发现双折射现象,同样也验证了β/γ结晶的生成,并且在IL添加量为1%时PVDF的球晶分布的更加均匀,球晶的粒径也明显较小。通过SEM观察,发...
【文章来源】：合肥工业大学安徽省 211工程院校 教育部直属院校
【文章页数】：121 页
【学位级别】：博士
【文章目录】：
摘要
Abstract
Acknowledgement
Motivation
1. Introduction
1.1 PVDF and its Polymorphism
1.2 Methods of Preparation of PVDF β phase
1.2.1 Uniaxial stretching
1.2.2 Melt crystallization
1.2.3 Solution casting
1.2.4 Copolymerization
1.2.5 Blends and Nanocomposites
1.3 Ionic Liquids(ILs)
1.3.1 Structure of Ionic Liquids
1.3.2 Structural Organization of IL in Solid/Liquid State
1.4 Multiwalled Carbon Nanotubes(MWCNT)
1.5 Crystallization Kinetics
1.5.1 Crystallization Kinetics' Theories
1.5.2 Differential Scanning Calorimetry and Crystallization Kinetics
1.6 ILs in Polymer Science
1.7 IL as β/γ Phase Enhancer in PVDF
2. Modification of PVDF Crystalline Morphology through Amphiphilic Ionic Liquid
2.1 Introduction
2.2 Experimental
2.2.1 Materials and Methods
2.2.1.1 Purification of PVDF
2.2.1.2 Preparation of PVDF/IL Blends
2.3 Characterization
2.3.1 FTIR-ATR,X-ray Diffraction(XRD) Spectroscopy
2.3.1.1 FTIR-ATR
2.3.1.2 XRD
2.3.2 Optical Microscopy(OM)
2.3.3 Polarized Optical Microscopy(POM)
2.3.4 Differential Scanning Calorimetry(DSC)
2.4 Results and Discussion
2.5 Conclusion
3. Crystal Structure Transformation of PVDF through Amphiphilic Ionic Liquid Modified MWCNT
3.1 Introduction
3.2 Experimental
3.2.1 Materials
3.2.2 Preparation of PVDF/IL/MWCNT Nanocomposites
3.3 Characterization
3.3.1 FTIR-ATR/X-ray Diffraction(XRD)Spectroscopy
3.3.1.1 FTIR-ATR
3.3.1.2 XRD
3.3.2 Optical Microscopy(OM)
3.3.3 Polarized Optical Microscopy(POM)
3.3.4 Differential Scanning Calorimetry(DSC)
3.3.4.1 Nonisothermal Crystallization
3.3.4.2 Isothermal Crystallization
3.3.5 Scanning Electron Microscopy(SEM)
3.3.6 Dynamic Mechanical Analysis(DMA)
3.4 Results and Discussion
3.5 Conclusion
4. Crystallization Kinetics of PVDF Filled with MWCNT Modified by Amphiphilic Ionic Liquid
4.1 Introduction
4.2 Experimental
4.2.1 Materials
4.2.2 Preparation of PVDF/IL/MWCNT Nanocomposites
4.3 Characterization
4.3.1 Scanning Electron Microscopy(SEM)
4.3.2 FTIR-ATR/X-ray Diffraction (XRD) Spectroscopy
4.3.2.1 FTIR-ATR
4.3.2.2 XRD
4.3.3 Differential Scanning Calorimetry(DSC)
4.3.4 Crystallization Kinetics
4.4 Results and Discussion
4.5 Conclusion
5. Conclusion and Perspectives
6. References
7. Published Papers
本文编号：3524870
【文章来源】：合肥工业大学安徽省 211工程院校 教育部直属院校
【文章页数】：121 页
【学位级别】：博士
【文章目录】：
摘要
Abstract
Acknowledgement
Motivation
1. Introduction
1.1 PVDF and its Polymorphism
1.2 Methods of Preparation of PVDF β phase
1.2.1 Uniaxial stretching
1.2.2 Melt crystallization
1.2.3 Solution casting
1.2.4 Copolymerization
1.2.5 Blends and Nanocomposites
1.3 Ionic Liquids(ILs)
1.3.1 Structure of Ionic Liquids
1.3.2 Structural Organization of IL in Solid/Liquid State
1.4 Multiwalled Carbon Nanotubes(MWCNT)
1.5 Crystallization Kinetics
1.5.1 Crystallization Kinetics' Theories
1.5.2 Differential Scanning Calorimetry and Crystallization Kinetics
1.6 ILs in Polymer Science
1.7 IL as β/γ Phase Enhancer in PVDF
2. Modification of PVDF Crystalline Morphology through Amphiphilic Ionic Liquid
2.1 Introduction
2.2 Experimental
2.2.1 Materials and Methods
2.2.1.1 Purification of PVDF
2.2.1.2 Preparation of PVDF/IL Blends
2.3 Characterization
2.3.1 FTIR-ATR,X-ray Diffraction(XRD) Spectroscopy
2.3.1.1 FTIR-ATR
2.3.1.2 XRD
2.3.2 Optical Microscopy(OM)
2.3.3 Polarized Optical Microscopy(POM)
2.3.4 Differential Scanning Calorimetry(DSC)
2.4 Results and Discussion
2.5 Conclusion
3. Crystal Structure Transformation of PVDF through Amphiphilic Ionic Liquid Modified MWCNT
3.1 Introduction
3.2 Experimental
3.2.1 Materials
3.2.2 Preparation of PVDF/IL/MWCNT Nanocomposites
3.3 Characterization
3.3.1 FTIR-ATR/X-ray Diffraction(XRD)Spectroscopy
3.3.1.1 FTIR-ATR
3.3.1.2 XRD
3.3.2 Optical Microscopy(OM)
3.3.3 Polarized Optical Microscopy(POM)
3.3.4 Differential Scanning Calorimetry(DSC)
3.3.4.1 Nonisothermal Crystallization
3.3.4.2 Isothermal Crystallization
3.3.5 Scanning Electron Microscopy(SEM)
3.3.6 Dynamic Mechanical Analysis(DMA)
3.4 Results and Discussion
3.5 Conclusion
4. Crystallization Kinetics of PVDF Filled with MWCNT Modified by Amphiphilic Ionic Liquid
4.1 Introduction
4.2 Experimental
4.2.1 Materials
4.2.2 Preparation of PVDF/IL/MWCNT Nanocomposites
4.3 Characterization
4.3.1 Scanning Electron Microscopy(SEM)
4.3.2 FTIR-ATR/X-ray Diffraction (XRD) Spectroscopy
4.3.2.1 FTIR-ATR
4.3.2.2 XRD
4.3.3 Differential Scanning Calorimetry(DSC)
4.3.4 Crystallization Kinetics
4.4 Results and Discussion
4.5 Conclusion
5. Conclusion and Perspectives
6. References
7. Published Papers
本文编号：3524870
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