A new model for cellulose microfibril
纤维素微纤维的新模型
基本信息
- 批准号:08306009
- 负责人:
- 金额:$ 6.78万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:1996
- 资助国家:日本
- 起止时间:1996 至 1998
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
(1) Structure and morphology of cellulose microfibril :Cellulose chain was found to be in the unit cell with "parallel up" packing, and its reducing end coincides with the c-axis. Consequently, cellulose chain is synthesized on the non-reducing ends. Cellulose I beta crystal distorts some extent and, strictly speaking, it is imperfect crystal. Surface of the cellulose I alpha crystal might be different from that of I beta. It is likely that polymorph of native cellulose comes from with or without stress in the forming stage of the crystal. We succeeded in making a highly oriented film of cellulose microfibril. Neutron diffraction of this film revealed probable position of hydrogen in the cellulose crystal. Consequently, cellulose II crystal is an anti-parallel packing which is favorable to hydrophobic surfaces of the molecule. Beta chitin with parallel chain packing transforms into alpha form of anti-parallel one through swelling by HC1 solution in the similar process of cellulose I to II by alkali treatment.(2) Properties of cellulose microfibrilThermal expansion of cellulose crystal gave several new knowledges. The crystal expands to only aaxis direction. Resistibility of thermal decomposition depends on cellulose microfibril. We can estimate Poison's ratio of the cellulose crystal. Mechanical phenomena suggest an unstable crystalline region. Young's modulus of wood in the longitudinal direction indicates that orientation and density of non-crystalline cellulose is very similar to those of crystalline one. In case of ramie fibers non-crystalline parts exist in the both directions.(3) Susceptibility of cellulose microfibril for enzyme :Susceptibility of cellulose microfibril for enzyme depends on its morphology : Typical crystal of valonia also has some defects on its surface.Cellulose microfibrils have their own morphology coming from their origin.
(1)纤维素微纤丝的结构和形态:纤维素链以“平行向上”的方式堆积在晶胞中,其还原端与c轴重合。因此,纤维素链在非还原末端合成。纤维素I β晶体有一定程度的畸变,严格地说,它是不完全晶体。纤维素I α晶体的表面可能不同于I β晶体的表面。天然纤维素的多晶型可能来自于晶体形成阶段的应力或无应力。我们成功地制造了高度定向的纤维素微纤维膜。该膜的中子衍射揭示了氢在纤维素晶体中的可能位置。因此,纤维素II晶体是一种反平行堆积,有利于分子的疏水性表面。与纤维素Ⅰ ~ Ⅱ经碱处理的过程类似,β甲壳素经盐酸溶液溶胀后,由平行链堆积转变为反平行链堆积的α型。(2)纤维素微纤的性质纤维素晶体的热膨胀提供了一些新的认识。晶体仅向轴向膨胀。纤维素微纤的耐热分解性能决定于纤维素微纤。我们可以估算出纤维素晶体的毒药比例。机械现象表明一个不稳定的结晶区。木材纵向的杨氏模量表明,非晶纤维素的取向和密度与结晶纤维素非常相似。在苎麻纤维的情况下,非晶部分存在于两个方向上。(3)纤维素微纤丝对酶的敏感性:纤维素微纤丝对酶的敏感性取决于其形态:典型的橡花晶体在其表面也有一些缺陷。纤维素微纤丝有其自身的形态,这来自于它们的起源。
项目成果
期刊论文数量(25)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H.Shibazaki, S.Kuga and T.Okano: "Mecerization and acid hydrolysis of bacterial cellulose" Cellulose. 4. 75-87 (1997)
H.Shibazaki、S.Kuga 和 T.Okano:“细菌纤维素的Mecerization 和酸水解”纤维素。
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- 影响因子:0
- 作者:
- 通讯作者:
Y.Saito,T.Okano,J.-L.Putaux,F.Gaill,H.Chanzy: "Criystallosolvates of beta chitin and alcohols" 7th ICCC,Advances in Chitin Science. vol.2. 507-512 (1998)
Y.Saito、T.Okano、J.-L.Putaux、F.Gaill、H.Chanzy:“β 甲壳素和醇的结晶溶剂化物”第七届 ICCC,甲壳素科学进展。
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- 影响因子:0
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鮫島正浩: "セルラーゼとセルロース生分解研究の新局面" 木材学会誌. 42. 811-816 (1996)
Masahiro Samejima:“纤维素酶和纤维素生物降解研究的新方面”日本木材学会杂志 42. 811-816 (1996)。
- DOI:
- 发表时间:
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- 影响因子:0
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- 通讯作者:
Y.Saito, T.Okano, J-L.Putaux, F.Gaill, H.Chanzy: "Crystallosolvates of beta chitin and alcohols" 7th ICCC.Advances in Chitin Science. vol.2. 507-512 (1998)
Y.Saito、T.Okano、J-L.Putaux、F.Gaill、H.Chanzy:“β 甲壳素和醇的结晶溶剂化物”第七届 ICCC。甲壳素科学进展。
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- 影响因子:0
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A.Ishikawa,T.Okano J.Sugiyama: "Fine structure and tensile properties of ramie fibers in the cryptalline form of cellulose I,II,III_I,IV_I" Polymer. 38-2. 463-468 (1997)
A.Ishikawa,T.Okano J.Sugiyama:“纤维素 I、II、III_I、IV_I 隐形式的苎麻纤维的精细结构和拉伸性能”聚合物。
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OKANO Takeshi其他文献
OKANO Takeshi的其他文献
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{{ truncateString('OKANO Takeshi', 18)}}的其他基金
Vibrational properties of Picea woods grown in China as piano sound board
中国种植的云杉木用作钢琴音板的振动特性
- 批准号:
09556034 - 财政年份:1997
- 资助金额:
$ 6.78万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Dynamic analysis of crystal transformation of cellulose
纤维素晶体转变的动态分析
- 批准号:
07406018 - 财政年份:1995
- 资助金额:
$ 6.78万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Highly oriented cellulose and determination of its crystal structure
高取向纤维素及其晶体结构的测定
- 批准号:
04660179 - 财政年份:1992
- 资助金额:
$ 6.78万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Structural analysis of native cellulose and its derivatives by direct imaging of molecular chains
通过分子链直接成像对天然纤维素及其衍生物进行结构分析
- 批准号:
63440013 - 财政年份:1988
- 资助金额:
$ 6.78万 - 项目类别:
Grant-in-Aid for General Scientific Research (A)
Research on crystal structure of wood cellulose
木质纤维素晶体结构的研究
- 批准号:
61560183 - 财政年份:1986
- 资助金额:
$ 6.78万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)