A new catalyst,iron(Ⅱ) chelate of the schiff base derived from β-Ala and picoline,was successfully used for atom transfer radical polymerization.The reaction was carried out at 90℃ in bulk with ethyl 2-bromo-2-ethy...A new catalyst,iron(Ⅱ) chelate of the schiff base derived from β-Ala and picoline,was successfully used for atom transfer radical polymerization.The reaction was carried out at 90℃ in bulk with ethyl 2-bromo-2-ethylpropionate as the initiator.The molecular weight of the resulting polymer increases with increasing monomer conversion.The molecular weight distribution is not narrow(PDI=1.5～1.7),and the value of molecular weight detected is in good accordance with the calculated.The molecular weight distribution is 1.13 with the addition of 10% DMF.展开更多
本文报道用a-萘胺和琥珀酸酐合成1-萘基-琥珀酰亚胺(NPr),并用FT-IR、DSC、X-射线衍射和荧光等方法研究了该化合物的结构与性能.DSC和X-射线衍射结果表明,纯净NPr的熔点与John L Hubbard报道结果(147～149℃)不同,应为(158.3±0.2...本文报道用a-萘胺和琥珀酸酐合成1-萘基-琥珀酰亚胺(NPr),并用FT-IR、DSC、X-射线衍射和荧光等方法研究了该化合物的结构与性能.DSC和X-射线衍射结果表明,纯净NPr的熔点与John L Hubbard报道结果(147～149℃)不同,应为(158.3±0.2℃);熔融淬火样品仍存在部分结晶,并且在一定温度下发生冷结晶;FT-IR结果表明羰基伸缩振动产生反对称振动(1705cm-1)和对称振动(1779cm-1)的能级分裂;荧光光谱结果则进一步表明该化合物的电子云排布结构与单体萘环相似,其原因可归于羰基的诱导效应和共轭效应对氮原子的影响.展开更多
The effects of various reaction conditions on the preparation of polyalkylcyanoacrylate （PACA） nanoparticles are studied. The PACA nanoparticles with different crosslinking degrees and morphology are prepared. Addit...The effects of various reaction conditions on the preparation of polyalkylcyanoacrylate （PACA） nanoparticles are studied. The PACA nanoparticles with different crosslinking degrees and morphology are prepared. Addition of crosslinkers can not only adjust the particle size, but also change the morphology of PACA nanoparticles. Moreover, the loose network structure of the PACA nanoparticles with ＂core/shell-like＂ morloholozv is investizated by AFM and TEM in detail.展开更多
文摘A new catalyst,iron(Ⅱ) chelate of the schiff base derived from β-Ala and picoline,was successfully used for atom transfer radical polymerization.The reaction was carried out at 90℃ in bulk with ethyl 2-bromo-2-ethylpropionate as the initiator.The molecular weight of the resulting polymer increases with increasing monomer conversion.The molecular weight distribution is not narrow(PDI=1.5～1.7),and the value of molecular weight detected is in good accordance with the calculated.The molecular weight distribution is 1.13 with the addition of 10% DMF.
文摘本文报道用a-萘胺和琥珀酸酐合成1-萘基-琥珀酰亚胺(NPr),并用FT-IR、DSC、X-射线衍射和荧光等方法研究了该化合物的结构与性能.DSC和X-射线衍射结果表明,纯净NPr的熔点与John L Hubbard报道结果(147～149℃)不同,应为(158.3±0.2℃);熔融淬火样品仍存在部分结晶,并且在一定温度下发生冷结晶;FT-IR结果表明羰基伸缩振动产生反对称振动(1705cm-1)和对称振动(1779cm-1)的能级分裂;荧光光谱结果则进一步表明该化合物的电子云排布结构与单体萘环相似,其原因可归于羰基的诱导效应和共轭效应对氮原子的影响.
基金supported by the National Natural Science Foundation of China(Nos.20774053,20974056)the Natural Science Foundation of Tianjin(No.033802611)
文摘The effects of various reaction conditions on the preparation of polyalkylcyanoacrylate （PACA） nanoparticles are studied. The PACA nanoparticles with different crosslinking degrees and morphology are prepared. Addition of crosslinkers can not only adjust the particle size, but also change the morphology of PACA nanoparticles. Moreover, the loose network structure of the PACA nanoparticles with ＂core/shell-like＂ morloholozv is investizated by AFM and TEM in detail.
