摘要
综述了纤维素粘弹性的研究进展。因为纤维素具有复杂的微细结构,所以其粘弹性也很复杂。首先纤维素的粘弹性与含水量密切相关,水的存在引发了一些转变;其次,在纤维素中存在两种类型的水分子,一种是与纤维素分子链紧密连接的水分子,一种是与纤维素分子链松散连接的水分子;第三,在纤维素的动态力学曲线上出现了许多转变峰,一般有α松弛、β松弛、γ松弛;第四,α松弛包括α1、α2、αsh、αH2o和α3松弛,α松弛包括βal和βa2,γ松弛出现在较低的温度下(-100℃)。所有这些松弛都反映了纤维素中结构的不均匀性。在无定形区域内,就存在两种类型的无定形区,一种是分子内红键高度作用而分子间氢键作用较少的无定形区,另一种是分子间氢健高度作用而分子内氢键作用较少的区域。
This paper attempts to bring together basic and complex informaion which has beengathered on cellulosic viscoelasticity over the last few decades. Because of the complicated struc-ture, cellulose has a complicated viscoelasticity. First, the cellulosic viscoelasticity has a largelydependence on water-contained amount. The existence of waer in cellulose brings about sometransihons. Second, in cellulose, there are two types of water molecules. One is the waer moleculestightly-bond with cellulosic micromolecules. Another is the loosely-bond water moecules.Third, in the curve of dynandc viscoelasticity of cellulose, many absorptions(transitikons) occur in-cluding α,β, and γ relaxations. a relaxation consists of α1, α2, αsh,αH2o, α3 relaxations.β relaxationconsists of βal,βa2 relaxations. Fourth, all aboye transitions reflects the structural heterogeneity ofcellulose.
出处
《纤维素科学与技术》
CAS
CSCD
1999年第1期1-8,共8页
Journal of Cellulose Science and Technology
关键词
纤维素
粘弹性
动态力学性能
高聚物
cellulose, viscoelasticity, relaxation, transition, dynamic mechanical property, hydrogen bonding