超分子聚合物的多重氫鍵誘導手性組態

Abstract

相較於傳統的化學性聚合如自由基聚合、縮合聚合反應，近年來物理性聚合亦備受重視。本研究是設計一個簡單的合成路徑將聚丙二醇兩端導入多點式氫鍵的官能基，在多點式互補氫鍵的驅使下產生自組裝形成高分子的鏈段，並進行性質測定。同時，我們亦合成對照組，即導入不同超分子官能基，以便探討此超分子官能基對各項物理性質的影響。 本文藉由1H-NMR、FT-IR鑑定其結構，證實(cy)2PPO、(ur-cy)2PPO及(cy-amide)2PPO成功被合成出來。並搭配DOSY核磁共振光譜分析，在濃度為0.3g/ml時，(ur-cy)2PPO重覆單元約為2500，說明此多點式互補氫鍵可自組裝成高分子的鏈段，並進行一系列物理性質的鑑定。經由旋光度的測定發現(ur-cy)2PPO具有光學活性，證明了類螺旋結構。在應用端，由於1:32混摻鋰鹽比例可以成膜，故此超分子作用力改善材料的機械性質。

Compared to traditional chemical polymerization, such as radical polymerization, condensation polymerization, physical aggregation in recent years has also been taken seriously. This study is to design a simple synthetic pathway to import multi-point hydrogen bond functional groups at both ends of the polypropylene glycol, and self-assembly was driven to form the polymer chain segment by multiple complementary hydrogen bonding. We determine the product's physical properties. At the same time, we also synthesized the control group, that is to import different supramolecular functional groups, in order to explore the impact of different supramolecular functional groups on the various physical properties .By 1H-NMR, the FT-IR, structures were identified and confirmed (cy) 2PPO, (ur-cy) 2PPO and (cy-amide) 2PPO have been successfully synthesized. With DOSY NMR spectroscopy, in the concentration 0.3g/ml, (ur-cy) 2PPO repeat unit is about 2500, indicate that this multiple complementary hydrogen bonding indeed drive self-assembled into the polymer chain segments. Through optical rotation measurements ,we found (ur-cy)2PPO optically active, the evidence of a class of spiral structure. On the application side, due to the low molecular weight PPO monomer(with ratio polymer/lithium salt=32:1) can film ,therefore supramolecular interactions successfully improve the mechanical properties of the material.