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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 廖文彬(Wen-Bin Liau) | |
| dc.contributor.author | Ya-Hsuan Chen | en |
| dc.contributor.author | 陳雅鉉 | zh_TW |
| dc.date.accessioned | 2021-06-16T05:09:14Z | - |
| dc.date.available | 2019-09-02 | |
| dc.date.copyright | 2014-09-02 | |
| dc.date.issued | 2014 | |
| dc.date.submitted | 2014-08-19 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55835 | - |
| dc.description.abstract | 本研究探討在不同溶劑處理效應下，左旋聚乳酸(PLLA)分子鏈的構型(conformation)對結晶動力學的影響。
利用PLLA溶液狀態下時，不同的溶劑對PLLA有著不同的作用力，使得PLLA在溶液中的分子鏈型態不同，有了不同的熱力學平衡狀態。因此由氯仿與四氫夫喃溶解後的PLLA兩者相比，使得經由不良溶劑(四氫夫喃)溶解過的PLLA其分子鏈構型gtt存在比例增加。因為分子鏈比例的不同使得PLLA的結晶速率、結晶誘導時間以及晶核密度等等而有所不同。我們預測不同溶劑處理過PLLA後，會造成高分子鏈構型的不同而對PLLA結晶行為有所影響。因此利用POM、DSC、XRD等儀器觀察其因溶劑效應帶來的結晶行為之改變，找出結晶動力學模式與熱力學參數間的關係後，發現分子鏈構型gtt的存在比例變多，提升了分子鏈的成核能力，進而影響PLLA的α與α結構存在共存區的結晶動力學。 | zh_TW |
| dc.description.abstract | Influence of chain conformation on crystallization kinectics of Poly L-lactide been dissolved in different solvent was studied in the research. The increase of population of gtt chain conformers which changes the equilibrium state on thermodynamic; Furthermore, the crystallization rate, the induction time and the nucleus density are also changing. Using polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction to observe the crystallization behavior of oriented amorphous PLLA, we connected the relation between crystallization kinetics model and thermodynamic parameters. We found that increasing the population of gtt comformer before crystallization improves the nucleation ability of PLLA and finally changes the crystallization kinetics at the temperature α and α' coexist. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T05:09:14Z (GMT). No. of bitstreams: 1 ntu-103-R01527055-1.pdf: 3310504 bytes, checksum: 7b2da1ab85830fdf3f46408fe54dccfb (MD5) Previous issue date: 2014 | en |
| dc.description.tableofcontents | 中文摘要.....................................................................................................................iv
英文摘要 ........................................................................................................................vi 圖目錄 ix 表目錄 xiii 第一章 緒論.....................................................................................................................1 第二章 文獻回顧 2 2-1 聚乳酸簡介 2 2-1-1 生物可分解性高分子 2 2-1-2 聚乳酸的合成與應用 4 2-1-3 聚乳酸的結晶結構 7 2-2 高分子結晶理論 10 2-2-1 高分子總體結晶 11 2-2 Hoffman-Lauritzen Theory 15 第三章 實驗 22 3-1實驗藥品 22 3-2 實驗儀器 23 3-3 實驗方法 25 3-3-1 製備表面積較大的PLLA 25 3-3-2霍氏轉換紅外光光譜儀(Fourier-Transform Infrared Spectrometer，FTIR) 26 3-3-3 熱微差掃瞄分析儀(Differential Scanning Calorimetry, DSC) 26 3-3-4 廣角X光繞射儀(Wide Angle X-ray Diffractometer, WXRD) 27 3-3-5 偏光顯微鏡(Polarized Optical Microscopy, POM) 28 第四章 結果與討論 29 4-1 溶劑效應之探討 29 4-1-1 溶劑效應之鬆弛 32 4-1-2 溶劑效應對分子鏈構型之探討 39 4-2 溶劑效應與熱性質之關係 45 4-2-1平衡熔點 45 4-2-2 等溫結晶 50 4-3 結晶結構鑑定分析 56 4-3-1 不同溫度等溫結晶 56 4-3-2 結晶成長機制分析 61 4-4 偏光顯微鏡(Polarized Optical Microscopy)結晶性質分析 68 4-4-1溶劑效應對結晶型態之影響 68 4-4-2 球晶成長速率分析 72 參考文獻 79 | |
| dc.language.iso | zh-TW | |
| dc.title | 不同溶劑處理效應對左旋聚乳酸結晶行為的影響 | zh_TW |
| dc.title | Effects of solvents on the Crystallization Behavior of PLLA | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 102-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 曾勝茂(ZENG,SHENG-MAO),童世煌(TONG,SHI-HUANG),羅世強(LUO,SHI-JIAN) | |
| dc.subject.keyword | 聚乳酸,溶劑效應,分子鏈構型,結晶動力學, | zh_TW |
| dc.subject.keyword | PLLA,solvent effect,chain conformation,crystallization kinetics, | en |
| dc.relation.page | 82 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2014-08-19 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
| 顯示於系所單位： | 材料科學與工程學系 | |
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