研究生: |
余志賢 Chi-Hsien Yu |
---|---|
論文名稱: |
團聯式共聚物之奈米結構研究:階級性自組裝結構與光子晶體材料之製備 Fundamental Studies on the Nanostructure of Microphase Separated Block Copolymers:The Formation of Self-assembled Hierarchical Morphologies and Fabrications of Photonic Bandgap Materials |
指導教授: |
陳信龍
Hsin-Lung Chen |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 94 |
中文關鍵詞: | 團聯式共聚合物 、光子晶體 、四面堆積圓柱 |
外文關鍵詞: | block copolymer, photonic crystal, square packed cylinder |
相關次數: | 點閱:2 下載:0 |
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本研究主要以團聯式共聚合物(block copolymer)之分子自組裝特性為主軸,以摻合均聚物使系統產生微相分離來製造出具有規則性之奈米形態(如1-D stacked lamellae、double gyroid等 ),並將之應用於光子晶體材料上;另一方面利用團聯式共聚合物與界面活性劑以離子鍵錯合之方式,使錯合系統自組裝形成階級性奈米結構(hierarchical nanostructure)期望能應用於奈米材料上。
於研究中我們採用polystyrene-block-polyisoprene(PS-b-PI)為系統,以均聚物h-PS、h-PI進行雙成分及三成分wet brush摻合。於三成分摻合(PS-b-PI/h-PS/h-PI)中,以等量摻合之方式使系統維持層狀奈米結構,並藉由不同組成下所對應之層狀厚度(interlamellar distance),來對系統之光學性質進行測試,以作為1-D光子晶體材料;雙成分摻合(PS-b-PI/h-PS)則是藉由控制系統內PS的體積分率(ψPS)為0.66,使系統呈現3-D double gyroid結構,並配合臭氧裂解程序的應用,來使系統的介電常數對比提高,並探討其於光子晶體材料應用之可行性。
在共聚物polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP)與界面活性劑dodecylbenzene sulfonic acid (DBSA)利用質子化錯合之方面,主要探討不同錯合組成(y=0.25~1.0)系統之形態變化,以FTIR、POM、SAXS、低溫切片、TEM及TEMS模擬等來對各組成之形態進行討論,在組成y=0.25時由其lamella-within-lamella形態中有少部分的cylinder-within-lamella形態,推測系統”zipper mechanism”之存在;並於組成y=0.5及y=0.75發現了cylinder-within-lamella形態的四面圓柱堆積(square-packed cylinder)結構,這是由於系統內較為延伸之P4VP鏈段傾向分布於square phase之Wigner-Seitz cell 之角落,藉此來減輕square phase 之packing frustration效應,以增加其形態之穩定度,此結構有別於一般常見的六角圓柱堆積(hexagonally packed cylinder),於目前文獻上尚未被觀察到,而其形態之確立將有助於我們於2-D結構奈米材料上之應用。
Microphase separation in self-assembled diblock copolymers may generate a series of long-range ordered microdomain morphology (1-D stacked lamellae, hexagonally packed cylinders, gyroid, and BCC packed spheres) depending on the strength of interblock repulsion and the composition of the constituting blocks. In the present research, we have investigated the morphologies of self-assembled blend system constituting of a diblock copolymer polystyrene-b-polyisoprene (PS-b-PI) and a homopolymer polystyrene (PS) exhibiting lamellae and bicontunious gyroid periodic microstructures as 1-D and 3-D photonic crystals materials. Through blending PS and PI homopolymer with a lamellae-forming PS-b-PI with short block length, we have systematically increased the lamella thickness, while effectively retaining the long-range order. The resultant blends exhibits excellent visible light (350~600 nm) reflectance with wavelength tunable by the lamellar thickness. Further a bicontinuous gyroid morphology has been successfully generated in PS-b-PI/PS blend. The PI phase in these blends were selectively degraded using ozone to yield thin films containing bicontinuous nano-channels. The nanoporous film thus produced is expected to display high refractive index contrast useful for 3-D photonic crystal applications. In addition, the hierarchical structures of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) and dodecylbenzene sulfonic acid (DBSA) complex systems were investigated by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The ionic ally bonded diblock copolymer-surfactant complex was observed to form supramolecules exhabiting structure-within-structure morphology at two length scales. A new morphology of square-packed cylinder-within-lamellae has been observed in the PS-b-P4VP(DBSA)0.5/0.75 system which could be ascribe to the homogeneous binding between P4VP chain and DBSA. The more stretched P4VP chains can reach to fill the corner of the Wigner-Seitz cell of square lattice to relieve the higher packing frustration so that the stability of square-packed cylinder-within-lamellae is enhanced. This interesting morphology is quit different from the usually observed hexagonally packed cylinder morphology and could be useful for 2-D pattern nanomaterial applications.
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