通过双醚化反应、氯甲基化反应以及在强碱性条件下进行的脱氯化氢反应制备聚(2－甲氧基－5－丁氧基)对苯乙炔(PMOBOPV)、聚(2－甲氧基－5－己氧基)对苯乙炔(PMOHOPV)、聚(2，5－二丁氧基)对苯乙炔(PDBOPV)和聚(2，5二己氧基)对苯乙炔(PDHOPV)等四种可溶性聚对苯乙炔(PPV)衍生物，通过紫外－可见吸收光谱对产物分子结构进行表征．结果显示，PMOBOPV、PMOHOPV、PDBOPV和PDHOPV的共轭π电子发生π→π^*跃迁的吸收峰分别位于491 nm、495 nm、504 nm和510 nm处，相应的光学禁带宽度分别为2．23 eV、2．18 eV、2．12 eV和2．07 eV．利用简并四波混频技术测量PPV衍生物的三阶非线性光学性能，探讨了分子结构对PPV衍生物三阶非线性极化率(x⁽³⁾)的影响．研究发现，激发波长为532nm时，PMOBOPV、PMOHOPV、PDBOPV和PDHOPV的共振x⁽³⁾值分别为3．45×10^－10、5．13×10^－10、7．15×10^－10和9．61×10^－10 esu；激发波长为1064 nm时，它们的非共振x⁽³⁾值分别为1．09×10^－11、1．42×10^－11、1．62×10^－11和2．14×10^－11 esu．

A soluble poly(2-methoxy-5-decoxy)-p-phenylene vinylene (PMODOPV) was synthesized via dehydrochlorination reaction and characterized by UV-visible absorption spectrum. The results showed that PMODOPV had a broad optical absorption band in the range of 450---550 nm and the optical band gap was calculated to be around 2.12 eV. The third-order nonlinear optical susceptibilities (χ(3)) of PMODOPV films implanted by 30-keV N+ ions in the dose range of 3.8 * 10^(15)---9.6 * 10^(16) ions/cm2 were measured by degenerate four-wave mixing (DFWM) technique. The results demonstrated that the resonant and off-resonant χ(3) values were all enhanced significantly by means of ion implantation. The maximum resonant χ(3) value of 9.67 * 10^(-9) esu at 532 nm and off-resonant χ(3) value of 2.49 * 10^(-10) esu at 1.064 μm were obtained when the ion dose was 3.8 * 10^(16) ions/cm2.