摘要
采用热机械分析技术(TMA)研究了山羊绒单纱在4种不同恒定拉伸应力及压缩应力(6 MPa)下,单纱形变与温度的关系。研究表明,在很小的拉伸应力(0.01 MPa)及压缩应力(6 MPa)下,山羊绒单纱在219℃收缩,而在230℃突变伸长,此收缩起源于山羊绒纤维中α-螺旋结晶的熔融,突变伸长起源于山羊绒纤维的“粘流”,即山羊绒纤维结晶熔融后发生“粘流”;而在较高的拉伸应力条件(200 MPa)下,山羊绒单纱在190℃就发生突变伸长,即山羊绒纤维的“粘流”温度低于结晶熔融温度。
By Thermal Mechanical Analysis （TMA） method, the changes in length of cashmere single yarn with increasing temperature are investigated under four kinds of different tensile stresses of 0.01, 0.05, 6 and 200 MPa respectively and compressive stress of 6 MPa. The TMA curves show that cashmere yarn shrinks at 119 ℃ and abruptly extends at 230 ℃ under the lower tensile stress. The shrink results from the melting of a-helix crystallites to random coil in fiber and abrupt extension results from the ＂viscous flow＂ of the macromolecules in fiber, so cashmere fiber ＂viscously flow＂ after melting. However, the cashmere yarn abruptly extends at 190 ℃ under the higher tensile stress of 200 MPa, so its ＂viscous flow＂ temperature is lower than its melting one.
出处
《毛纺科技》
CAS
北大核心
2006年第10期49-52,共4页
Wool Textile Journal
关键词
山羊绒
TMA
热学性能
熔融
粘流
cashmere
TMA
thermal properties
melting
viscous flow
