| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.499 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Effect of Chain Length of Hardener on Thermal Stabilities and Mechanical Properties of Epoxy/diamine System |
| 초록 | Epoxy resins are one of the most important thermosetting, are extensively used as coatings, electronic materials, adhesives, and structural applications.1,2 Epoxy resins is converted into a three-dimensional crosslinked network through cure reactions, and the bulk properties of the final product are determined by crosslinked structures. Therefore, the application ranges of the cured epoxy product depend largely on the selection of curing agents. In this study, the effect of chain length of hardener on the physicochemical and mechanical properties of diglycidylether of bisphenol-A (DGEBA)/aliphatic diamine system are investigated. The carbon number of diamine was varied from 2 to 12. The cure behaviors, glass transition temperature (Tg), and thermal stabilities of the DGEBA/diamine system were characterized by using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). For the mechanical properties of the casting specimens, the critical stress intensity factor (KIC) and flexural strength were measured. Fig. 1 shows DSC thermograms of the DGEBA/diamine system. The cure reaction enthalpy of the DGEBA/diamine system is reduced with increasing the chain length of the diamine. The Tg values of the systems are decreased as chain length of the diamine increased, as shown in Fig. 2. This can be attributed to the introduction of linear CH2 units into the crosslinked network structure of the epoxy resins, resulting in decreasing the rigidity of the DGEBA/diamine system. Fig. 1. DSC thermograms of the Fig. 2. tan δ of the DGEBA/diamine systems DGEBA/diamine systems. as a function of temperature. References 1. C. A. May, Epoxy Resins, Chemistry and Technology, Marcel Dekker, New York, 1988, pp 1. 2. S. J. Park, F. L. Jin, and J. R. Lee, Mater. Sci. Eng. A 374, 109 (2004). |
| 저자 | 김범용, 박수진, 이재락 |
| 소속 | 한국화학(연) |
| 키워드 | epoxy resins; thermal properties; mechanical properties |
