Structure and interaction of flexible dendrimers in concentrated solution
Structure and interaction of flexible dendrimers in concentrated solution
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DOI：
10.1063/1.3155208
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发表时间：
2009-06-28
影响因子：
4.4
通讯作者：
Harnau, L.
中科院分区：
文献类型：
--
作者：
Rosenfeldt, S.;Ballauff, M.;Harnau, L.
我们研究了浓溶液中相互作用对第四代柔性聚丙胺树枝状聚合物构象的影响。通过体积分数高达 0.23 的小角中子散射研究具有质子化和氘化端基的树枝状聚合物的混合物。该值在树枝状聚合物的重叠浓度范围内。通过使用质子化和氘化溶剂的混合物来改变溶质和溶剂之间的对比度。这使我们能够详细研究氘代树枝状聚合物的部分结构因素。对测量的散射强度的分析表明，与柔性线性聚合物中显着的构象变化相比，柔性树枝状聚合物的形状实际上与浓度无关。
We study the influence of mutual interaction on the conformation of flexible poly(propyleneamine) dendrimers of fourth generation in concentrated solution. Mixtures of dendrimers with protonated and deuterated end groups are investigated by small-angle neutron scattering up to volume fractions of 0.23. This value is in the range of the overlap concentration of the dendrimers. The contrast between the solute and the solvent was varied by using mixtures of protonated and deuterated solvents. This allows us to investigate the partial structure factors of the deuterated dendrimers in detail. An analysis of the measured scattering intensities reveals that the shape of the flexible dendrimers is practically independent of the concentration in contrast to the pronounced conformational changes in flexible linear polymers.