铟酞菁功能化的四臂星型聚甲基丙烯酸甲酯的合成及三阶非线性光学性质

Synthesis and Third-order Nonlinear Optical Properties of Indiumphthalocyanine-functionalized Four-arm Star Polymethylmethacrylate

以四(2-氯丙酰胺基)氯代铟酞菁[InClPc(NHCOCHClCH3)4]为引发剂,通过原子转移自由基聚合(ATRP)法制得一种新型的以氯代铟酞菁为核的四臂星型聚甲基丙烯酸甲酯(PMMA-InClPc).通过傅里叶红外光谱(FTIR)、紫外-可见光谱(UV-Vis)和核磁共振氢谱(1H NMR)表征了PMMA-InClPc的结构;通过凝胶渗透色谱(GPC)测定了聚合物的分子量及分子量分布;研究了所制备聚合物的聚合反应动力学,其聚合过程符合一级反应动力学.使用调Q倍频Nd∶YAG脉冲激光系统,在输出激光波长为532 nm,脉冲宽度为21ps条件下,通过Z扫描测试研究了聚合物的三阶非线性光学性质.通过计算可知,当PMMA-InClPc的分子量为2902时,其三阶非线性极化率值最大,为7.216×10-10esu.

Using tetra-kis（2-chloropropionamido） indium（Ⅲ） phthalocyanine chloride [ InClPc（ NHCOCH-ClCH3 ） 4 ] as initiator, a novel four-arm star polymethylmethacrylate（ PMMA-InClPc） with an indium chloride phthalocyanine core was synthesized by atom transfer radical polymerization（ ATRP） method. PMMA-InClPc structure was characterized by Fourier transform infrared （ FTIR） spectroscopy, ultraviolet-visible （ UV-Vis） spectroscopy and hydrogen nuclear magnetic resonance spectroscopy （ 1H NMR ） techniques. The molecular weight and molecular weight distribution of polymer sample were measured by gel permeation chromatograph （ GPC） . Polymerization reaction kinetics of the synthesized polymer was also studied by GPC. The results show that polymerization process follows a first-order reaction kinetics. The third order nonlinear optical properties were measured by the Z-scan technique at 532 nm using a frequency-doubled Q-switching Nd：YAG laser pulse with pulse width of 21 ps. When the molecular weight of polymer is 2902, the third-order nonlinear polarizability X（3） reaches the maximum value, which is 7.216í10-10 esu by calculation. These results display that the synthesized PMMA-InClPc polymer has potential nonlinear optical applications.