Enhancement of Ablative Characteristics of Phenolic Composites by Adding CNT

학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부(멀티스케일 기계설계전공), 2014. 2. 이우일.Composite materials are widely replacing previous traditional materials such as metals, woods and polymeric materials. The phenolic matrix can be modified by adding materials in order to improve the mechanical properties especially thermal resistance and abrasion. In this study, Carbon Nanotube(CNT) is used as a reinforcement particle to the phenolic resin for the purpose of improving ablative characteristics. Composite containing CNT shows advanced ablation characteristics in comparison with neat phenolic resin. CNT affects degree of crystallization of specimen with functioning as a crystalline nucleus in abrasion process. X-ray Diffraction(XRD) and SEM were carried out to confirm changing degree of crystallization of CNT-reinforced phenolic composites.ABSTRACT 1 TABLE OF CONTENTS 3 LIST OF TABLES AND FIGURES 4 INTRODUCTION 7 1.1 INTRODUCTION 7 1.2 BACKGROUND THEORY 10 1.2.1 Ablation 10 1.2.2 Crystallization 11 1.3 PURPOSE OF STUDY 13 2 MATERIALS AND EXPERIMENTAL 14 2.1 MATERIALS 14 3.1 Phenolic resin 14 3.2 Carbon Nanotube 16 2.2 PREPARATION OF THE SPECIMENS 17 2.2.1 Dispersion of CNT 17 2.2.2 Curing Process 18 2.3 MEASUREMENTS 19 2.3.1 Ablation Experimental 19 2.3.2 X-ray Diffraction(XRD) 20 2.3.3 Raman Spectroscopy 23 2.3.4 Scanning Electron Microscope 24 3. RESULT AND DISCUSSION 25 3.1 ABLATION RATIO OF COMPOSITES BY ADDING CNT 25 3.2 XRD 26 3.3 RAMAN SPECTROSCOPY 27 3.4 SEM 27 4. CONCLUSIONS AND FUTURE WORK 28 REFERENCES 30 초 록 54Maste