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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 戴桓青(Hwan-Ching Tai) | |
| dc.contributor.author | Chih-Hui Chang | en |
| dc.contributor.author | 張智輝 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:21:33Z | - |
| dc.date.available | 2021-11-06 | |
| dc.date.available | 2022-11-24T03:21:33Z | - |
| dc.date.copyright | 2021-11-06 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-10-12 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/80910 | - |
| dc.description.abstract | 纖維素是植物細胞中含量最豐富的生物高分子化合物，也是提供木材結構支撐力的主要角色。由於將纖維素與半纖維素、木質素分離上的困難，微纖維的確切奈米結構仍存有不少爭議，因此在現存的模型中，構成微纖維的纖維素鏈數自18到30都有研究提出。我們使用小角度X 光散射、X光繞射、固態核磁共振光譜等分析技術去調查裸子植物/軟木 ( 雲杉和杉木 ) 和被子植物/硬木 ( 楓木和梓木 ) 中的微纖維結構。 首先，小角度X光散射法利用物質電子密度的差異去判斷微纖維的尺寸與形狀。我們發現裸子植物 ( 雲杉和杉木 ) 的微纖維截面積尺寸大於被子植物 ( 楓木和梓木 )。而碳13核磁共振可利用纖維素與其他物質的流動性差異去估算木材樣品的結晶度。其結晶度為4號碳的結晶性纖維素 ( 89 ppm ) 和非結晶纖維素 ( 84 ppm ) 訊號中所佔面積比例。雲杉和杉木 ( 軟木 ) 的結晶度比楓木和梓木 ( 硬木 ) 還要大。 接著，在X光繞射中，利用謝樂公式計算木材中的晶域大小。晶域包括結晶核區和類結晶殼區。而結果顯示軟木和硬木的晶域大小並無太大差異。根據結晶區的纖維素鏈數 ( 小角度X 光散射 ) 和結晶度 ( 固態核磁共振光譜 ) 可計算出在微纖維的纖維素鏈總數。因為微纖維由六聚體酶合成，所以纖維素鏈數為六的倍數。因此，我們的數據支持裸子植物和被子植物皆有24條纖維素。 另一爭論為微纖維是否維持分離狀態或是凝聚現象。凝聚現象分為兩種：融合 ( 形成單一結晶區 ) 和 聚集 ( 外側接觸但沒有形成連續結晶區) 。 在小角度X 光散射中，發現古琴木材樣本中的微纖維截面積增加為兩倍。推測為半纖維素的降解導致微纖維聚集。此外，X光繞射的數據支持聚集現象，而非融合。以鹼處理或加熱的人工老化木材樣品中，也能發現聚集現象。 | zh_TW |
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| dc.description.tableofcontents | ABSTRACT ii 中文摘要 iv INDEX v LIST OF FIGURES vii LIST OF TABLES xi ABBREVIATION xiv Chapter 1 INTRODUCTION 1 1.1 Introduction of wood species 1 1.2 The chemical components of wood 5 1.2.1 Cellulose 6 1.2.2 Hemicellulose 8 1.2.3 Lignin 11 1.3 Small-angle X-ray Scattering 13 1.4 X-ray Diffraction 15 1.5 Solid-state Nuclear Magnetic Resonance spectroscopy 18 1.6 The models of cellulose microfibrils 21 1.7 Aging effect 23 1.8 The determination of the crystallinity of cellulose 25 1.9 Purpose of Research 30 Chapter 2 MATERIALS AND METHODS 32 2.1 Materials 32 2.1.1 Equipment 32 2.1.2 Chemicals 32 2.1.3 Wood samples 32 2.1.4 Chemical treatment 35 2.2 Methods 35 2.2.1 Small-angle X-ray Scattering 35 2.2.2 X-ray diffraction 41 2.2.3 Solid-state Nuclear Magnetic Resonance spectroscopy 49 Chapter 3 RESULTS AND DISCUSSION 51 3.1 Small-angle X-ray Scattering 51 3.1.1 Modern woods 51 3.1.2 Antique guqin wood samples 71 3.1.3 Chemical treatment 82 3.2 X-ray diffraction 120 3.2.1 Modern spruce and maple 120 3.2.2 Guqin 131 3.2.3 Chemical treatment 136 3.3 Solid-state Nuclear Magnetic Resonance spectroscopy 143 3.4 The chain number of cellulose microfibrils 151 Chapter 4 CONCLUSION 154 REFERENCE 156 APPENDIX 165 | |
| dc.language.iso | en | |
| dc.subject | 固態核磁共振 | zh_TW |
| dc.subject | 纖維素 | zh_TW |
| dc.subject | 半纖維素 | zh_TW |
| dc.subject | 小角度X光散射 | zh_TW |
| dc.subject | X光繞射 | zh_TW |
| dc.subject | XRD | en |
| dc.subject | ssNMR | en |
| dc.subject | Cellulose | en |
| dc.subject | Hemicellulose | en |
| dc.subject | SAXS | en |
| dc.title | 木材纖維素的奈米結構鑑定 | zh_TW |
| dc.title | The Nanostructure of Cellulose Microfibrils in Gymnosperm and Angiosperm Woods | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 曹正熙(Hsin-Tsai Liu),陳浩銘(Chih-Yang Tseng),林盈仲 | |
| dc.subject.keyword | 纖維素,半纖維素,小角度X光散射,X光繞射,固態核磁共振, | zh_TW |
| dc.subject.keyword | Cellulose,Hemicellulose,SAXS,XRD,ssNMR, | en |
| dc.relation.page | 193 | |
| dc.identifier.doi | 10.6342/NTU202103235 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-10-13 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 化學研究所 | zh_TW |
| 顯示於系所單位： | 化學系 | |
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