CAJ | 학술논문

制备了高度水合状态的纤维素凝胶，研究了水在凝胶中的存在状态及其对纤维素结晶的影响.结果表明，水在纤维素水凝胶中存在非冻结水、可冻结水和自由水3种状态.非冻结水饱和含量为一般纤维素吸附水中不可冻结水的5倍以上，高达1.6 g/ g.纤维素在水合状态下结晶受到抑制，随着水含量的减小，结晶会趋于完善.在环境温度下，当纤维素中只存在非冻结水时，其与纤维素分子链间氢键作用力不稳定，对纤维素结晶抑制作用较弱，纤维素结晶比较完善，导致纤维素断裂时表现为脆性断裂.水介质的引入有望为纤维素的利用开发提供一种新的思路.
제비료고도수합상태적섬유소응효，연구료수재응효중적존재상태급기대섬유소결정적영향.결과표명，수재섬유소수응효중존재비동결수、가동결수화자유수3충상태.비동결수포화함량위일반섬유소흡부수중불가동결수적5배이상，고체1.6 g/ g.섬유소재수합상태하결정수도억제，수착수함량적감소，결정회추우완선.재배경온도하，당섬유소중지존재비동결수시，기여섬유소분자련간경건작용력불은정，대섬유소결정억제작용교약，섬유소결정비교완선，도치섬유소단렬시표현위취성단렬.수개질적인입유망위섬유소적이용개발제공일충신적사로.
A study inspired by biosynthesis of cellulose in higher plant was made on an attempt to investigate the state of water in cellulose hydrogels and its influence on the crystallization of cellulose. The differential scanning calorimetry(DSC) results indicate that there are 3 types of water in cellulose hydrogels: nonfreezing water, freezing bound water and free water. The ratio of the nonfreezing water to dry cellulose in the hydrogels is about 1. 6 g / g, 5 times more than the adsorbed water in dry cellulose. In such a highly hydrated state, the aggregation and crystallization of cellulose are inhibited, the lower the water content, the completer the crystal-lization of cellulose, which is characterized by X-ray diffraction(XRD), polarizing optical microscope(POM) and scanning electron microscopy(SEM). It is suggested that the little inhibition effect of nonfreezing water on the crystallization is due to the instability of the hydrogen bond between the water and cellulose. The results demonstrate the high content of nonfreezing water in cellulose hydrogels.