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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >A New Family of Dendrimers with Naphthaline Core and Triphenylamine Branching as a Two-Photon Polymerization Initiator
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A New Family of Dendrimers with Naphthaline Core and Triphenylamine Branching as a Two-Photon Polymerization Initiator

机译：带有萘核和三苯胺支链作为双光子聚合引发剂的树枝状聚合物的新家族

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摘要

A new family of dendrimers with a naphthaline-core flanked on both sides, by triphenylamine-branching was successfully synthesized and presented an increasing two-photon absorption (TPA) cross section from 959 to 9575 GM with the generation number from 1 to 3. These dendrimers can efficiently initiate the acrylate resins to polymerization to obtain very regular diamond structures and display higher two-photon polymerization (TPP) efficiency and sensitivity with the generation number. The overall TPP processes involved in two-photon excitation, intramolecular charge transfer, and intramolecular energy transfer as well as intermolecular electron transfer between initiator and monomer are described. Steady-state fluorescence and time-resolved decay dynamics revealed that the light energy was absorbed by peripheral triphenylamine unit and then transferred to generation 1, the energy funnel. Although strong interaction between dendritic initiator and monomer has been observed based on fluorescence quenching measurements, no intermolecular energy transfer but electron transfer is confirmed by the cyclic voltammograms and HOMO—LUMO measurements. That is, the dendritic initiator first produces the excited state via two-photon absorption, then transfers an electron to an acrylate monomer, and finally induces the later to polymerize.
机译：通过三苯胺支链成功合成了一个两侧带有萘核的树枝状大分子新家族，并显示了从959到9575 GM的增加的两光子吸收（TPA）截面，世代数从1到3。树枝状大分子可以有效地引发丙烯酸酯树脂的聚合反应，从而获得非常规则的金刚石结构，并显示出更高的双光子聚合（TPP）效率和灵敏度，并带有代数。描述了涉及双光子激发，分子内电荷转移，分子内能量转移以及引发剂与单体之间的分子间电子转移的整个TPP过程。稳态荧光和时间分辨衰减动力学表明，光能被外围的三苯胺单元吸收，然后转移到第一代，即能量漏斗。尽管基于荧光猝灭测量已经观察到树枝状引发剂和单体之间的强相互作用，但是通过循环伏安图和HOMO-LUMO测量确认没有分子间能量转移而是电子转移。即，树枝状引发剂首先通过双光子吸收产生激发态，然后将电子转移至丙烯酸酯单体，最后诱导后者聚合。

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