离子注入改性聚[2-甲氧基-5-(3’-甲基)丁氧基]对苯乙炔微观结构与性能  

Microstructures and Thermal Stability of Poly[2-methoxy-5-(3'-methyl) butoxy]-p-Phenylene Vinylene Film Modified by N Ion Implantation

作　　者：李宝铭[1] 吴洪才[1] 刘效增[1] 高潮[1] 孙建平[1] 

机构地区：[1]西安交通大学电信学院光电技术与太阳能研究所,西安710049

出　　处：《真空科学与技术学报》2005年第2期120-122,126,共4页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金(No.60277002)资助

摘　　要：采用低能氮正离子(N+)对π共轭高分子聚[2甲氧基5(3’甲基)丁氧基]对苯乙炔(MMB PPV)薄膜进行离子注入改性,注入剂量为9.6×1016ions/cm2,能量为30keV。利用红外光谱、紫外可见吸收光谱、X射线衍射、透射电镜及热失重等手段对离子注入改性MMB PPV薄膜的微观结构及热学性能进行研究。红外光谱显示,注入后分子侧链烷氧取代基的C H振动峰强度减弱,同时在3442、1622cm-1等处出现了N H键的振动峰;薄膜的紫外可见吸收光谱向长波方向移动,且在可见光区范围内的吸收强度增加;离子注入使聚合物分子链排列更加规整,取向度明显增大,结晶性能大大改善;经过离子注入后,聚合物材料的初始分解温度由未注入时的245.64℃提高至280.52℃,分子的热稳定性能显著增强。Poly[2-methoxy-5-(3'-methyl)butoxy]-p-phenylene vinylene(MMB-PPV) film was modified by low energy nitrogen ion implantation.Its microstructures and thermal stability were studied by Fourier transform infra-red spectroscopy(FT-IR),ultraviolet-visible light absorption spectroscopy(UV-Vis),X-ray diffraction(XRD),transmission electron microscopy(TEM) and thermogravimetry(TG).FT-IR spectra show that the implanted N+ ions induce C-H and C-C σ bond scission and N-Hσ bond formation,which dramatically change the molecular structures.A red shift of the absorption edge and enhancement of absorbance in the visible light region can be clearly observed in the UV-Vis spectra.In addition,the ion implantation improves the alignment and orientation of the molocular chains.The results show that N ion implantation increases the thermal decomposition temperature of the MMB-PPV film from 245.64 ℃ to 280.52 ℃,considerably improving its thermal stability.

关 键 词：离子注入 苯乙炔 丁氧基 甲氧基 结构与性能 改性 紫外-可见吸收光谱 甲基 π共轭高分子 红外光谱 X射线衍射 PPV薄膜 烷氧取代基 聚合物材料 热稳定性能 注入剂量 热学性能 微观结构 透射电镜 吸收强度 可见光区 结晶性能 

分 类 号：TQ241.22[化学工程—有机化工] TN305.3[电子电信—物理电子学]