摘要
报道了一种通过旋涂制备NLO聚合物多层膜的方法。紫外一可见吸收光谱及膜的厚度表征说明，在所得多层膜的结构中，聚合物单层膜的厚度可以较好地控制在100～200nm之间，所得含有5个双层的NLO多层膜（厚度1.6μm）具有良好的结构均一性，光学显微镜下没有观察到明显的结构缺陷。与单层具有较大厚度的NLO聚合物薄膜（如2～4μm）相比，所得聚合物多层膜可以允许掺杂更多的发色团而不发生相分离。
Non-linear optical （NLO） polymers have potential application in ultra-fast electro-optic modulators.Although physical doping of NLO chromophores into a matrix polymer appears to be efficient in the preparation of NLO polymers and electric poling, it suffers from low chromophore loading and poor temporal stability. In this paper, a new approach of preparation towards highly efficient NLO materials was demonstrated by doping a novel type of zwitterionic chromophore （BPIPP-DEMI） into an acid-containing matrix polyimide （API） and fabrication viaalternate spin-coating of polymeric muhilayer films comprising layers of the resulting NLO polymer and layers of a spacing tertiary amine-containing polyimide （BPI）. The individual polymer layers had a thickness in the range of 100～200 nm, which can be readily controlled by adjusting the concentration of polymer solutions and the spin speed.Investigation of the UV-Vis absorption and the growth in the thickness of the muhilayer films indicated a uniform growth of multilayer films. A five bi-layer NLO muhilayer film （1.6 μm） was thus fabricated, with each API layer containing 10 wt% of the NLO chromophore BPIPP-DEMI. In contrast to API films containing 10 wt% of BPIPP- DEMI, which showed significant phase separation, NLO multilayer films containing the same amount of BPIPP-DEMIexhibited no obvious phase separation under optical microscope, indicating a better host for NLO chromophores.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2008年第4期394-398,共5页
Acta Polymerica Sinica
关键词
聚酰亚胺多层膜
非线性光学
制备
光学性质
Polymeric muhilayer, Nonlinear optics, Preparation, Optical properties
