A new approach to a mechanochromic sensor based on a trigger-induced ring opening of phenolphthalein

다국어 초록 (Multilingual Abstract)

Polymers that undergo a color change in response to external mechanical force have found great utility as structural damage sensors. Despite numerous efforts to develop efficient mechanochromic polymers, achieving precise control of the mechanochromic turn-on point has remained challenging. In this study, we present a straightforward yet effective method for the convenient manipulation of the colorimetric turn-on point. The method is the introduction of a protective layer with a pre-existing crack positioned between a sensor layer and a trigger solution. When subjected to elongation, the crack tears open, allowing the trigger solution to come into contact with the sensor layer, causing a transition from colorless to colored. By adjusting the length and depth of the crack, we made it easy to control the point at which mechanical discoloration begins.

목차 (Table of Contents)

• LIST OF TABLES. iii
• LIST OF FIGURESiv
• ABSTRACTviii
• CHAPTER 1: INTRODUCTION1
• 1.1 Mechanochromic sensors1
• 1.2 Dye blending method3
• 1.3 Ring-opening method8
• 1.4 Radical generation method.16
• 1.5 Photonic crystal method21
• CHAPTER 2: RESEARCH CONCEPT27
• CHAPTER 3: RESULTS AND DISCUSSION..31
• 3.1 Sensor system.31
• 3.2 Trigger solution.33
• 3.3 Strain dependent optical properties of turn-on sensor.38
• CHAPTER 3: CONCLUSION .45
• CHAPTER 4: EXPERIMENTAL.47
• 4.1 Materials and instruments47
• 4.2 Preparation of TPU-phenolphthalein film48
• 4.3 Crack depth measurement procedure.48
• 4.4 Sensor fabrication48
• REFERENCE.51
• 국문 요지.55
• 감사의 글.56