纤维解取向行为的粘弹性分析  

Viscoelastic Analysis for the Disorientation Behavior of Polymer Fiber

作　　者：焦娜[1] 户晓媛[1] 孔德玉[1] 韩旭[1] 徐木梁华[2] 曹维宇[1,2] 

机构地区：[1]北京化工大学有机无机复合材料国家重点实验室 [2]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《高分子材料科学与工程》2015年第9期98-100,105,共4页Polymer Materials Science & Engineering

基　　金：国家重点基础研究发展计划(973资助)(2011CB605603)

摘　　要：建立了高分子纤维材料的自由状态的二元件弹簧与粘壶的串联粘弹性模型,对解取向的热力学本质及动力学方程进行了推导,用这一模型可以合理诠释解取向过程的粘弹性本质。通过粘弹本构方程的推导,研究了解取向过程中的瞬时应力和收缩应变与温度及时间的函数关系。结果表明,纤维解取向的自发倾向取决于纤维的初始内应力和环境温度,解取向环境的温度越高,时间越长,纤维解取向时的内部瞬时内应力越小,而收缩应变越大,lnσ(t)和ln[-(γ(t))]呈现对时间的一次函数关系。高分子链本身的粘弹特性如相对分子质量、分子链的柔性,以及微观松弛时间等都将影响纤维的解取向行为。Thermal dynamic and kinetic equations for disorientation behavior of polymer fiber materials were deduced by the establishment of the viscoelastic model, which was consists of a spring in series with a dashpot under no limitation condition. The disorientation behavior of polymer fiber materials was interpreted by this model reasonably from the viewpoint of viscoelasticity. According to the obtained viscoelastic equation, the function of inner stress and strain related to the temperature and time scales during the disorientation process of fiber was investigated. The results indicate that the spontaneous tendency of disorientation for fiber is determined by the original inner stress and the environmental temperature. During the disorientation process, with the increasing of temperature, the in-situ inner stress is decreased and the shrinkage strain is increased, the time scale shows the similar effects on them as well as temperature. The parameters of lna （t） and ln[ - （γ （t））] which relate to the inner stress and shrinkage strain show one order index function against the time scale. Besides, by analysing the other terms in this equation, the disorientation behavior of polymer fiber materials are also affected by the viscoelastic parameters of the polymer chain itself such as molecular weight, flexibility and relaxation time.

关 键 词：解取向 粘弹性 应力 应变 

分 类 号：TQ340.1[化学工程—化纤工业]