2015-02-132024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/680956摘要：童世煌副教授的研究專長為軟質材料的結構與物性，尤其專精於高分子結構分析與調控、雙親性分子自組裝行為、複雜流體之流變行為。主要在探討材料性質與奈米結構、分子運動的關連性，並藉由分子間的作用力來調控奈米結構以獲得所需的材料性質。 在本計劃研究中，透過親水性聚乙二醇胺與疏水性多代數之樹狀分子的偶合反應，可快速製備一系列的雙性樹枝狀高分子材料，包括線型-樹枝狀嵌段共聚高分子(LDBC)及啞鈴型-樹枝狀嵌段高分子(DDBC)，並探討其官能基及構型上的特殊性和自組裝行為。由於兩嵌段的不相容及體積上的差異，造成雙性嵌段樹枝狀共聚高分子會自組裝排列成不同形狀，製備新型的樹枝狀分子模板，並利用此核-殼結構提供離子螯合作用力和空間位阻穩定性，使得奈米金屬粒子能有有序的規則自我排列，而奈米金屬粒子如銀粒子能有效放大拉曼訊號的作用，未來將能應用於分子晶片、納米容器、新型催化劑和藥物釋放等用途。 因此，本計劃著重於雙性樹枝狀聚合物的製備及其相應的自組裝觀察，建立其結構相關的基本形態和自組裝的變化。預期建立有機/無機奈米金屬的製備及其應用物性評估，其自組裝和應用是有趣且值得探討的議題。 <br> Abstract: Dendritic structures are a relatively new class of macromolecules different from the conventional linear, crosslinked, or branched polymers. Their tree-like, monodisperse, structures lead to a number of interesting characteristics and features. In our pervious study, novel polyurethane/malonamide dendrons with different functional groups in the exterior were used as intercalating agents to modify montmorillonite in which larger d-spacing or exfoliation behavior were obtained. Moreover, different cationic exchange capacity (CEC) ratios for the dendron-modified organoclays were also investigated. Three dimensional conformation in different CEC ratios provides a new concept for the basis of dendrimer self-assembly behavior. In this study, a series of amphiphilic dendrimers were synthesized by the addition reaction of hydrophilic poly(oxyalkylene) and 4-isocyanate-4- (3,3-dimethyl-2,4-dioxo-azetidine) diphenyl methane based hydrophobic dendrons with different branched generations. We investigated structural peculiarities and the self-assembly behavior with various conformations including dumbbell shaped–dendrimer block copolymers (DDBC) and linear–dendrimer block copolymers (LDBC). The amphiphilic dendrimers will self-assembled into a novel polymer template with hydrophobic dendrons in the core and the hydrophilic poly(oxyalkylene) segment form loops in the corona shell on account of the favorable hydrophilic/hydrophobic balance. The long poly(oxyalkylene) loops extend into water phase that complex with ionic species which provided the suspension and steric stabilization to efficiently prevent nanoparticles from collision and flocculation. Utilizing the unique structure of dendritic copolymers as the templates and subsequently chemical reduction to generate a new type organic/metallic nanohybrids nanoparticle array. These dendritic polymer/nanoparticle hybrids are new compounds which is potentially useful for biochip, nano-containers, new catalysts and drug deliveries.樹枝狀共聚高分子銀粒子自組裝dendritic block polymersilver nanoparticleself-assembly