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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Early Stages of Formation of Branched Host-Guest Supramolecular Polymers
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Early Stages of Formation of Branched Host-Guest Supramolecular Polymers

机译：支链客体超分子聚合物形成的早期阶段

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摘要

A structural characterization of host-guest supramolecular copolymers, formed by an adamantane dimer and twoβ-cyclodextrin trimers in aqueous solution, has been carried out by combining small angle X-ray scattering and light scattering experiments. A shape-reconstruction method was applied to the SAXS data to obtain relatively high-resolution conformation information, and a correlation with the experimental dynamic light scattering results was performed, by estimating the hydrodynamic radii of the reconstructed shape through a shell model method. When applied on the solutions of the trimers, the analysis provides a globular reconstructed shape with a hydrodynamic radius in agreement with the experimental one. For the polymers, elongated structures were inferred which grow both in length and in cross section by increasing the concentration. Depending on theβ-cyclodextrin trimer employed in the polymer preparation, polymerization degrees ranging between roughly 7 and 14 or 9 and 22 were obtained in the concentration range 4.00-10.0 or 3.10-6.60 mM of the trimer (6.00-15.0 or 4.65-9.90 mM of the dimer). Aggregation schemes were proposed accounting for the formation of hyperbranched, linear, and network like polymers. The experimental results are not far from those expected on the basis of the aggregation in hyperbranched structure, for which the growth of elongated aggregates can be predicted in the early stages of the polymerization. However, the coexistence of the other structures, in particular of the linear one, cannot be ruled out.
机译：通过将金刚烷二聚体和两个β-环糊精三聚体在水溶液中形成的主体-客体超分子共聚物的结构表征，已通过结合小角度X射线散射和光散射实验进行了研究。将形状重构方法应用于SAXS数据以获得相对高分辨率的构象信息，并通过壳模型方法估计重构形状的流体动力学半径，从而与实验动态光散射结果进行关联。当应用于三聚体的溶液时，该分析提供了球形的重建形状，其流体动力学半径与实验形状一致。对于聚合物，推断出伸长的结构，其通过增加浓度而在长度和横截面上均生长。取决于聚合物制备中使用的β-环糊精三聚体，在三聚体的浓度范围为4.00-10.0或3.10-6.60 mM（6.00-15.0或4.65-9.90 mM）下，获得的聚合度范围约为7至14或9至22。二聚体）。提出了考虑超支化，线性和网络状聚合物形成的聚集方案。实验结果与基于超支化结构的聚集所预期的结果相距不远，对于该结果，可以在聚合的早期阶段预测伸长的聚集体的生长。但是，不能排除其他结构，特别是线性结构的共存。

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