【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。更多还原

【Abstract】 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.更多还原