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首页> 外文期刊>RSC Advances >Polyfluorenylacetylene for near-infrared laser protection: polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties
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Polyfluorenylacetylene for near-infrared laser protection: polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties

机译：用于近红外激光保护的多氟苯乙烯：聚合物合成，光学限制机制和分子结构与性能之间的关系

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摘要

A series of functional polyacetylenes bearing the fluorene moiety with different conjugated lengths and terminal substituents, poly[2-ethynyl-7-(4-nitrostyryl)-9,9-dioctyl-9H-fluorene] (P1), poly[2-ethynyl-7-( 4-(4-nitrostyryl) styryl)-9,9-dioctyl-9H-fluorene] (P2), poly[2-ethynyl-7-(4-(4-methoxystyryl) styryl)-9,9-dioctyl-9H-fluorene] (P3), poly[2-ethynyl-7-(4-(4-methylstyryl) styryl)-9,9-dioctyl-9H-fluorene] (P4), and poly[2-ethynyl-7-(4-(4-methylstyryl) styryl)-9,9-didodecyl-9H-fluorene] (P5), were designed and prepared using [Rh(nbd)Cl](2) as the catalyst. Their structures and properties were characterized and evaluated by FTIR, NMR, UV, FL, GPC and TGA analyses. The optical limiting properties were investigated using 450 fs laser pulses at 780 nm. These results show that the incorporation of styryl/stilbene functionalized polyfluorenylacetylenes has endowed resultant polyacetylenes with novel near-infrared laser protection properties and enhanced thermal stability. The optical limiting mechanism for laser protection was studied. It was found that the optical limiting properties mainly originated from two-photon absorption (TPA) of molecules in the resulting polyacetylenes. Additionally, it was also found that the functionalized polyacetylene with a longer fluorene-based conjugated chromophore and a stronger terminal electron acceptor group exhibits better optical limiting properties because of the larger p-electron delocalization and dipolar effect.
机译：一系列含有不同缀合长度和末端取代基的芴部分的功能性聚乙烯，聚[2-乙炔基-7-（4-硝基吡咯）-9,9-二辛基-9H-芴]（P1），聚[2-乙炔基] -7-（4-（4-硝基）styryl）-9,9-二辛基-9H-芴]（p2），聚[2-乙炔基-7-（4-（4-甲氧基苯甲酯）styryl）-9,9 - -dioctyl-9h-芴]（p3），聚[2-乙炔基-7-（4-（4-甲基苯乙烯）styryl）-9,9-二辛基-9h-芴]（p4）和聚[2-乙炔基设计和制备，使用[RH（NBD）Cl]（2）作为催化剂，设计和制备 - （4-甲基苯乙烯）STYRYL）-9,9-丁二癸基-9H-芴]（P5）。通过FTIR，NMR，UV，FL，GPC和TGA分析来表征和评估它们的结构和性质。在780nm处使用450 fs激光脉冲研究光学限制性。这些结果表明，掺入甾烷基/芪官能化的多氟苯乙烯酯具有新的近红外激光保护性能和增强的热稳定性的聚乙烯基。研究了激光保护的光学限制机构。发现光学限制性质主要来自所得聚乙烯基中的分子的两光子吸收（TPA）。另外，还发现，由于较大的P型电子移植和偶极效应，官能化聚乙炔和较长的芴基共轭发色团和更强的末端电子受体组具有更好的光学限制性。

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  • 来源
    《RSC Advances》 |2017年第85期|共12页
  • 作者

    Zhao Gang; Feng Yan; Guang Shanyi; Xu Hongyao; Lin Naibo; Liu Xiangyang;

  • 作者单位

    Donghua Univ State Key Lab Modificat Chem Fibers &

    Polymer Mat Coll Mat Sci &

    Engn Shanghai 201620 Peoples R China;

    Anhui Univ Key Lab Environm Friendly Polymer Mat Anhui Prov Sch Chem &

    Chem Engn Hefei 230039 Anhui Peoples R China;

    Donghua Univ Coll Chem &

    Bioengn Shanghai 201620 Peoples R China;

    Donghua Univ State Key Lab Modificat Chem Fibers &

    Polymer Mat Coll Mat Sci &

    Engn Shanghai 201620 Peoples R China;

    Donghua Univ State Key Lab Modificat Chem Fibers &

    Polymer Mat Coll Mat Sci &

    Engn Shanghai 201620 Peoples R China;

    Natl Univ Singapore Dept Chem Dept Phys 2 Sci Dr 3 Singapore 117542 Singapore;

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