| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 봄 (04/09 ~ 04/10, 고려대학교) |
| 권호 | 29권 1호, p.116 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Rheological properties of linear and star-shaped PLLA |
| 초록 | The linear and star-shaped poly(L-lactic acid)(PLLA) with similar molecular weight were prepared and their physical properties such as rheological properties, and crystallization behavior in quiescent and dynamic states were compared. In dynamic crystallization, the linear PLLA gave longer induction time and longer overall crystallization time than the star-shaped one although the former gave higher rate of crystallization in quiescent crystallization. In the concentrated solutions, the star-shaped PLLA gave higher values of dynamic viscosity, storage and loss moduli than the linear one. Further, the former exhibited more noticeable shear thinning behavior and greater dependence of rheological properties on temperature than the latter. For both PLLA melts, the modified Cole-Cole plot gave slope less than 2. Of two PLLA polymers the star-shaped PLLA gave smaller slope than the linear one. In addition, the former showed greater change of the slope with temperature than the latter. |
| 저자 | 김은섭1, 김병철1, 김수현2 |
| 소속 | 1한양대, 2한국과학기술(연) |
| 키워드 | linear PLLA; star-shaped PLLA; rheology; crystallization behavior; dynamic crystallization |
