| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 나노구조와 물성 |
| 제목 | Role of molecular motion upon mechanical properties of polymeric materials at bulk state |
| 초록 | Mechanical properties of polymeric materials are decisive in applications. Therefore, understanding of mechanisms of impact resistance or toughness of materials in general, and its improvement has been highly noticed to date. Addition of secondary phases with different physical properties into a polymer matrix has been extensively investigated, because of its easy accessibility and wide spectrum of properties expectable 1, 2. Toughness is, however, one of the most complex properties and difficult to control, because it is greatly affected by morphological and micromechanical parameters 2. Furthermore, incorporating secondary phases is able to induce additional effect that deteriorates impact resistance. As an alternative in toughening of polymer, it has been considered to modify chemical structure of polymers to allow polymer chains to dissipate external stresses. A glassy polymer would exhibit various relaxations at temperatures below the glass transition temperature, Tg. These are referred to as secondary relaxations, of which motions are much more localized than those involved in the glass transition. It is generally recognized that secondary relaxations are closely related to mechanical properties, such as ductility and toughness 3-5. In this review, we present the usefulness of molecular motions inducing sub-Tg relaxations as intrinsic toughener of thermoplastics at bulk state. References 1. Utracki, L. A. Polymer Alloys and Blends Oxford University press, New York, 1990. 2. Riew, C. K.; Kinloch, A. J. Ed. Toughened Plastics II American Chemical Society, Washington, DC, 1996. 3. Jho, J. Y.; Yee, A. F. Macromolecules 1991, 24, 1905. 4. Liu, J; Yee, A. F. Macromolecules 1998, 31, 7865. 5. Lee, S.-S.; Yee, A. F. Macromolecules 2003, 36, 7865. |
| 저자 | 이상수 |
| 소속 | 한국과학기술(연) |
| 키워드 | |
