Abstracts Category : Other

Hydrogen Bonding Interaction Mediated Self-Assembly Supramolecular Nanostructures

by Yi-syuan Lu

This thesis discusses the influence of hydrogen bonding interaction in polymer blends, the self-assembly and secondary structure behaviors of polypeptides, organic-inorganic POSS nanocomposites, and mesoporous materials, which could be applied in heavy metal and dye adsorption, which was summarized as follows:1. Two rigid-rod polypeptides including PMLG and PTyr formed a miscible blend system through intermolecular hydrogen bonding interaction and it is also stabilized the -helix conformation.2. In addition, blending PTyr with PS-b-P4VP could mediate the self-assembly structure and we found that the thermal properties could be significantly improved after thermal curing with HMTA, which shows better mercury absorption with high efficiency than other polymeric systems.3. Different functional groups of inorganic POSS NPs blending with various types of diblock copolymers were also investigated in this study. When blending OS-POSS and OP-POSS with PS-b-P4VP, the self-assembly behaviors could mediated by different functional group of POSS NPs. Due to the weak intermolecular interaction in OS-POSS/PS-b-P4VP, it shows the macrophase separation at higher OS-POSS concentration, which shows the dry behavior, but it displays the order-order morphological transition from lamellae, to cylinder, and finally to BCC spherical structure with the increase of OP-POSS concentration in PS-b-P4VP/OP-POSS with wet-brush behavior.4. Controlling different strength of hydrogen bonding interactions by choosing PS-based diblock copolymers including PS-b-P4VP, PS-b-P2VP, and PS-b-PMMA blending with OP-POSS. The results displayed that the hydrogen bonding interaction is the key role affecting the types of self-assembled structures.5. Finally, combination of organic biopolymers (PTyr) and inorganic tertraethylorthosilicate (TEOS), using block copolymer of PEO-b-PCL as template to prepare a biocompatible organic-inorganic composite material by using solvent extraction and that could be applied in dye adsorption.Advisors/Committee Members: Chih-Feng Wang (chair), Chih-Feng Huang (chair), Yeo-Wan Chiang (chair), Cheng-Tang Pan (chair), Jin-Long Hong (chair), Shiao-Wei Kuo (committee member).