| 학회 | 한국재료학회 |
| 학술대회 | 2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 | 21권 2호 |
| 발표분야 | D. 구조 재료 |
| 제목 | Content dependency of carbon powder for electrical conductivity of carbon powder-polymer composites |
| 초록 | It has been known that the electrical conductivity of insulating polymer matrix composites filled with conducting materials, such as carbon powder or metal powder, is mainly applied dielectric materials of electronic area, discontinuously increases at some content of the conducting material. This break point in the relationship between the content of conducting material and the conductivity of polymer matrix composites implies some sudden change in the dispersing state of conducting powders, i.e. the coagulation of powders to form networks which facilitates the electrical conduction through the polymer matrix composites. The dependency of critical content for electrical conductivity (break point) of carbon powder-filled polymer matrix composites with different matrix was studied as a function of carbon content to find a break point of the relationships between the carbon powder content and the electrical conductivity. The electrical conductivity jumps by as much as 10 orders of magnitude at the break point. The critical carbon powder content corresponding to the break point varies depending on the polymer species and tends to increase with the increase in the surface tension of matrix. In order to explain the dependency of the critical carbon powder content (Vc*) on the polymer species, a simple equation, Vc*=[1+3(γc1/2–γm1/2)2/(△qcR]-1 was derived under three assumptions, the most important of which was that when the interfacial excess energy introduced by particles of carbon powder into the polymer reaches a universal value. The equation well explains the dependency through surface tension, as long as the difference of the surface tensions between the particles of carbon powder and the polymer is not very small. This work has been supported by SYOWA Co. Tokyo (Japan). |
| 저자 | 신순기 |
| 소속 | 강원대 |
| 키워드 | electrical conductivity; carbon powder; polymer; composites; excess energy |
