Molecular Conformation and Intermolecular Interactions of Linear and Cyclic Amylose Derivatives in Solution

Molecular Conformation and Intermolecular Interactions of Linear and Cyclic Amylose Derivatives in Solution
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溶液中线性和环状直链淀粉衍生物的分子构象和分子间相互作用

DOI:
10.1002/masy.202200024
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发表时间:
2023
影响因子:
--
通讯作者:
Sato Takahiro
Sato Takahiro
中科院分区:
--
文献类型:
--
作者:
Terao Ken;Ryoki Akiyuki;Kitamura Shinichi;Sato Takahiro

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以柔性环状直链淀粉为原料,合成了四种刚性和半柔性环状聚合物。它们在稀溶液中的构象性质是根据蠕虫环模型的尺寸和流体力学性质确定的。某些环状聚合物的每残基h的螺旋上升大于或小于相应的线性链,表明环状聚合物的局部螺旋结构与线性链的不相同。由第二维里系数和手性识别能力检测到的分子间相互作用与直链聚合物不同,表明分子间相互作用是由局部结构变化引起的。研究还发现,刚性环聚合物在高浓度下可以形成液晶相。X-射线衍射结果表明,在液晶相中,环链形成假棒状构象,表明分子间排斥体积效应显著影响聚合物链的构象.
Four kinds of rigid and semiflexible ring polymers are synthesized from flexible cyclic amylose. Their conformational properties in dilute solution are determined from dimensional and hydrodynamic properties in terms of the wormlike ring model. The helix rise per residuehof some ring polymers is larger or smaller than that for the corresponding linear chains, indicating that the local helical structure of the ring polymer is not the same as that for the linear chain. Intermolecular interactions detected by the second virial coefficient and chiral recognition ability of some ring polymers are different from the linear chain, suggesting the local structural change causes the intermolecular interactions. The study also finds that rigid ring polymers can form liquid crystal phase at high concentration. X‐ray diffraction results suggest that the ring chains form pseudo rodlike conformation in the liquid crystal phase, showing that intermolecular excluded volume effects significantly influence the conformation of the polymer chains.
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