Star-shaped polymers have attracted attention due to their unique solution properties and viscosities. These effects are attributed to their hydrodynamic radii that differ significantly from those of linear polymers. The present study reports the synthesis of star-shaped helical polyacetylenes substituted with l-valine- and l-threonine-based optically active groups. The formation of star-shaped polymers was confirmed by size exclusion chromatography, solution viscosity, dynamic light scattering, and small-angle X-ray scattering measurements. The chiroptical intensities of the star-shaped polymers tended to be smaller than those of the corresponding linear polymers in solution but larger in the film state. The water contact angles and refractive indices of the star-shaped polymers were smaller than those of the linear polymers.

中文翻译：

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具有螺旋聚乙炔臂的星形聚合物。线性螺旋聚乙炔的固溶和固态性能比较


星形聚合物因其独特的溶液特性和粘度而备受关注。这些效应归因于它们的流体动力学半径与线性聚合物的流体动力学半径明显不同。本研究报道了星形螺旋聚乙炔的合成，该聚乙炔被基于 l-缬氨酸和 l-苏氨酸的光学活性基团取代。通过尺寸排阻色谱、溶液粘度、动态光散射和小角 X 射线散射测量证实星形聚合物的形成。星形聚合物的手光强度在溶液中往往小于相应的线性聚合物，但在薄膜状态下较大。星形聚合物的水接触角和折射率小于线性聚合物。