研究生: |
沈暐鈞 Wei-chung Shen |
---|---|
論文名稱: |
利用可逆性加成-分裂鏈轉移聚合法及鏈接反應經由多功能嫁接策略製備含多面體倍半矽氧烷寡聚物之星狀複合高分子 Versatile Grafting Approaches to Star-Shaped POSS-Containing Hybrid Polymers using RAFT Polymerization and Click Chemistry |
指導教授: |
黃炳照
Bing-joe Hwang |
口試委員: |
張豐志
none 林智汶 Chi-wen Lin |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 143 |
中文關鍵詞: | 可逆性鏈轉移聚合法 、鏈接化學 、多面體倍半矽氧烷寡聚物 、星狀高分子 |
外文關鍵詞: | RAFT polymerization, click chemistry, POSS, star polymer |
相關次數: | 點閱:209 下載:0 |
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本研究致力於利用可逆性加成-分裂鏈轉移聚合法(RAFT)和鏈接化學(Click chemistry)以”Grafting to”和”Grafting from”不同嫁接策略製備出聚甲基丙烯酸甲酯(PMMA)含多面體倍半矽氧烷寡聚物(POSS)之星狀複合高分子,並且探討不同嫁接策略製備星狀複合高分子之差異及特性。對於”Grafting to” 嫁接策略而言,首先製備出修飾含炔類之多面體倍半矽氧烷寡聚物(8P-POSS),並利用鏈接化學嫁接上不同分子量之末端修飾有疊氮之PMMA,最終獲得以POSS為核之星狀高分子(Star Polymer)。對於”Grafting from” 嫁接策略而言,首先製備POSS表面具有八個二硫代酯(dithiobenzoate groups)之新型態RAFT鏈轉移試劑,並且有效的利用並且控制於RAFT聚合反應中,最終同樣的成功的製備出POSS為核之星狀高分子。
利用這些有效的工具以”Grafting to”或者”Grafting from”嫁接策略皆能有效控制高分子鏈結構及接枝密度。然而,”Grafting to”策略因為高分子鏈長產生之立體障礙效應,使得嫁接密度下降 (95.5% 到28.4%);”Grafting from” 策略以8CTA-POSS為核心成長高分子,嫁接密度達96.4%,但聚合過程中有機會伴隨著線性高分子在外圍產生,尤其在預期分子量越大之星狀複合高分子更為明顯。最終,此研究提供了多樣性嫁接策略製備出含有POSS之星狀高分子,此珍貴的資訊展現不同嫁接策略之優點,並可延伸至其它材料之表面修飾化學之應用。
Both click chemistry and reversible addition-fragmentation chain transfer (RAFT) polymerization were used to prepare star-shaped POSS-containing polymer hybrids using ‘grafting to’ and ‘grafting from’ approaches. For the ‘grafting to’ approach, we first prepared alkyne-functionalized POSS (8P-POSS), which was used to modify azido-terminated polymethyl methacrylate (PMMA) with different Mw moieties to generate star polymers using click chemistry. For the ‘grafting from’ approach, new RAFT agents with 8 terminal dithiobenzoate groups on the surface of POSS were prepared, and successively used in the RAFT polymerization to produce well-defined star-shaped polymers. These powerful tools gave control over the polymer’s: length, architecture and graft density in both the ‘grafting to’ and ‘grafting from’ approaches; however, graft density decreased due to the effect of steric hindrance predominating on the surface of POSS. Here, we provide a versatile strategy to prepare star-shaped POSS-containing polymer hybrids, together with valuable information showing the advantages of different grafting reactions applicable to surface modification applications.
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