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[求助]
求高人帮忙翻译两段文献（有关光引发剂的）
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Cp2ZrCl2 is presented as both an effective photoinitiator and additive for radical photopolymerization reactions in aerated conditions. This compound is characterized by remarkable properties: (i) an efficiency higher than that of a reference Type I photoinitiator (2,2-dimethoxy-2-phenylacetophenone, DMPA), (ii) an excellent ability, when added to DMPA, to overcome the oxygen inhibition of the polymerization, and (iii) a never reported in situ photoinduced and oxygen-mediated formation of zirconium-based nanoparticles (diameter ranging from 50 to 70 nm). The photochemical properties of Cp2ZrCl2 are investigated by steady state photolysis and electron spin resonance (ESR) experiments. The high reactivity of this compound is ascribed to a bimolecular homolytic substitution SH2 (clearly characterized by molecular orbital calculations) which converts the peroxyls into new polymerization-initiating radicals and oxygenated Zr-based nanoparticles. In conclusion, Cp2ZrCl2 is characterized by striking and unusual properties when used in a photopolymerization reaction: (i) this is a better initiator than DMPA for polymerization in aerated conditions; (ii) this structure can be used as an additive in combination with a commercial Type I initiator to overcome the oxygen inhibition (very good polymerization profiles were obtained); and (iii) zirconiumbased nanoparticles can be in situ generated, which can further increase the mechanical properties of the photosensible materials. |
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德安缘化工: 金币+10, ★有帮助 2015-03-26 09:31:46
德安缘化工: 金币+10, ★有帮助 2015-03-26 09:31:46
Cp2ZrCl2是一种可以在空气条件下使用的有效的光引发剂和自由基光聚合反应的催化剂。这种化合物具有显著的特征 i)比I型光引发剂(2、2-二甲氧基-2-二苯基乙酮，DMPA)具有更高的效率,(2)与DMPA并用，可以避免产生氧阻聚现象,当添加到注射剂,克服氧气抑制聚合,(iii)原位光诱导生成氧化 Zr纳米颗粒 (直径从50到70nm)。通过稳态光解和电子自旋共振(ESR)实验研究了Cp2ZrCl2的光化学性质。这种化合物高反应活性归因于一个双分子的均裂替代SH2(分子轨道计算验证),将过氧化氢转换为新的聚合引发的自由基和氧化的Zr纳米颗粒。总之,Cp2ZrCl2在光聚合反应中有着显著而又不同寻常的特性 i) 在空气条件下这种引发剂比DMPA具有更高的效率;(2)这种结构可以作为添加剂结合商业i型引发剂克服了有氧阻聚(可以得到非常好的聚合分布);(iii)zirconiumbased纳米颗粒可以原位生成,从而进一步增加光敏材料的力学性能。 |
2楼2015-03-25 20:41:22
3楼2015-03-26 09:31:22