Alignment of polyamic acid molecules containing azobenzene in the backbone structure: Effects of polarized ultraviolet light irradiation and subsequent thermal imidization
Alignment of polyamic acid molecules containing azobenzene in the backbone structure: Effects of polarized ultraviolet light irradiation and subsequent thermal imidization
复制标题
主链结构中含有偶氮苯的聚酰胺酸分子的排列：偏振紫外光照射和随后的热酰亚胺化的影响
DOI：
10.1063/1.1533090
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发表时间：
2003
影响因子：
3.2
通讯作者：
S. Ushioda
中科院分区：
文献类型：
--
作者：
K. Sakamoto;K. Usami;M. Kikegawa;S. Ushioda
研究了主链含偶氮苯单元的聚酰胺酸（PAA）薄膜的分子取向。用线偏振紫外光（LPUVL）诱导分子取向各向异性。随后的热亚胺化所造成的分子取向的变化也进行了研究。通过测量薄膜的偏振红外吸收光谱来确定聚丙烯酸和聚酰亚胺骨架结构的取向。当PAA膜暴露于波长为365至400 nm的LPUVL，在正常的入射角，永久性的取向变化的PAA骨架结构发生通过重复的光致异构化反应的偶氮苯单元。PAA骨架结构向垂直于LPUVL偏振方向的平面旋转。在随后的热亚胺化的分子顺序显着增加周围的方向垂直于LPUVL的偏振方向和表面法线。这种增强…
We have investigated the molecular orientation in the films of polyamic acid (PAA) with azobenzene units in the backbone structure. Anisotropic molecular orientation was induced by irradiation of linearly polarized ultraviolet light (LPUVL). The change in the molecular orientation caused by subsequent thermal imidization was also investigated. The orientation of the PAA and polyimide backbone structures was determined by measuring the polarized infrared absorption spectra of the films. When the PAA film was exposed to LPUVL of wavelength 365 to 400 nm at normal incidence, permanent orientational change of the PAA backbone structure occurred through repeated photoisomerization reactions of the azobenzene unit. The PAA backbone structure rotated toward the plane perpendicular to the polarization direction of LPUVL. In subsequent thermal imidization the molecular order increased significantly around the direction perpendicular to both the polarization direction of LPUVL and the surface normal. This enhanceme...
影响因子：
64.8
作者：
GIBBONS, WM;SHANNON, PJ;SWETLIN, BJ
通讯作者：
SWETLIN, BJ