| 학회 |
한국고분자학회 |
| 학술대회 |
2008년 가을 (10/09 ~ 10/10, 일산킨텍스) |
| 권호 |
33권 2호 |
| 발표분야 |
고분자 구조 및 물성 |
| 제목 |
Polymer chain anisotropy of bi-functional photo-alignment layer studied by the optical and NEXAFS techniques |
| 초록 |
The formation of UV-induced chain anisotropy of a photo-alignment layer was investigated. The specially designed photo-aligning polyimide was capable of being decomposed and dimmerized by the UV illumination, and both photo-processes contributed to the resultant chain anisotropy simultaneously. The individual processes were confirmed selectively by IR. The wavelength dependence of the chain anisotropy or optical birefringence was shown by making a power spectrum of the birefringence. With the knowledge of the wavelength dependence, we measured selectively the rates of formation of the chain anisotropy induced by each processes. The bi-functionality enabled a controlled anisotropy distribution along the depth of polyimide thin film. Simultaneous working of the two photo-processes on the film resulted in lower chain anisotropy at the top surface than in bulk region; the photo-dimerization alone made a reversed result according to the NEXAFS (Near Edge X-ray Absorption Fine Structure) measurement. It could be explained by the difference in free volume between the top surface and bulk region. |
| 저자 |
고완희1, 이병현1, 이윤정1, 조정호1, 김경준1, 양찬우2, 박찬언2
|
| 소속 |
1LG화학, 2포항공과대 |
| 키워드 |
NEXAFS; 광배향막; polymer chain anisotropy
|
| E-Mail |
|
