라텍스 응집법을 이용한 흑연 나노 시트(그래핀)와 SBR의 나노복합소재 개발

Title
라텍스 응집법을 이용한 흑연 나노 시트(그래핀)와 SBR의 나노복합소재 개발
Authors
김진실
Keywords
라텍스응집법을이용한흑연나노시트그래핀와sbr의나노복합소재개발
Issue Date
2011
Publisher
인하대학교
Abstract
Water-borne conductive SBR (styrene butadiene rubber) composites containing surface-modified multi-layered graphene sheets (MLGSs) were prepared by a simple heterocoagulation process. Two different types of MLGSs were used and compared; carboxylated MLGSs and cetyltrimethyl ammonium bromide (CTAB)-stabilized MLGSs. SBR latex was mixed with the well-dispersed MLGS aqueous dispersion and they were heterocoagulated with the aid of a flocculant, polyaluminium chloride (PAC), at elevated temperature. After particle growth and successive stabilization steps, particulated SBR/MLGS composites were prepared in the size range of 10-100 μm. It was found that the CTAB-stabilized MLGSs were more effectively dispersed in the SBR matrix due to their electrostatic attraction with the negatively charged SBR colloid particles. The MLGS-containing SBR composites exhibited improved thermal stability and electrical conductivity. Importantly, the percolation threshold for the electrical conductivity was achieved at a low concentration of MLGSs, i.e., 0.5 wt%, using this heterocoagulation process.
Description
List of Scheme iii List of Figures iv List of Tables vi Abstract vii Korean Abstract viii PART1 1 Chapter 1.1 INTRODUCTION 1 Chapter 1.2 EXPERIMENTAL 4 1.2.1 Materials 4 1.2.2 Preparation of MLGS dispersions 6 1.2.3 Heterocoagulation process 6 1.2.4 Characterization 9 Chapter 1.3 RESULTS AND DISCUSSION 10 1.3.1 Dispersion stability of MLGSs 10 1.3.2 Heterocoagulation of SBR and various MLGS dispersions 15 1.3.3 Thermal properties of the composites 21 1.3.4 Electrical conductivity of the composites 24 Chapter 1.4 CONCLUSION 28 PART2 29 Chapter 2.1 INTRODUCTION 29 Chapter 2.2 EXPERIMENTAL 32 2.2.1. Materials 32 2.2.2. Preparation of MLGS dispersions 34 2.2.3 Heterocoagulation process 34 2.2.4 Characterization 35 Chapter 2.3 RESULTS AND DISCUSSION 36 2.3.1 Dispersion stability of MLGSs 36 2.3.2 Heterocoagulation of SBR and various MLGS dispersions 39 2.3.3 Thermal properties of the composites 48 2.3.4 Electrical conductivity of the composites 51 Chapter 2.4 CONCLUSION 55 Reference 56
URI
http://dspace.inha.ac.kr/handle/10505/22874
Appears in Collections:
College of Engineering(공과대학) > Chemical Engineering (화학공학) > Theses(화학공학 석박사 학위논문)
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