摘要
设计了多级多倍连续热拉伸工艺对芳砜纶水洗丝进行热拉伸,研究了从350~390℃的热拉伸温度对纤维结构和性能的影响。通过力学性能、动态热力学分析和热失重分析研究了不同热拉伸温度下纤维的性能变化,结合光学显微镜、同步辐射广角X-射线衍射仪研究了不同温度热拉伸下纤维形态结构和超分子结构的变化。研究发现:纤维热拉伸前后热分解温度(T)d变化不明显,玻璃化转变温度(T)g有所提高,纤维的断裂强度和模量显著提高;但断裂强度和伸长率对温度的依赖性出现了先增大后减小的变化趋势,过高的拉伸温度导致纤维脆性增加,断裂强度和伸长率减小;随着热拉伸温度的升高,纤维的晶态结构趋于完善,结晶度、取向度和晶粒尺寸随之增大,但密度变化并不显著。
The pre-drawn Tanlon fiber was heat-drawn with the designed technology of multiple ratios at different temperature varying from 350 to 390 ℃.The properties of the specimens were characterized by stress-strain test,DMA and TGA.It was shown that the decomposition temperature varied little while the glass transition temperature Tg increased with the heat-drawn temperature.The tenacity and initial modulus increased when the pre-drawn fiber was heat-drawn although the dependence of mechanical properties on temperature was not linear.From the results of morphology and crystalline structure analysis,it is clear that the crystalline structure formed and the crystallinity,crystal orientation and crystallite size increased of the fibers increased with the heat-drawn temperature.It suggested that the mechanical and thermal properties of Tanlon pre-drawn fiber improved by heat-drawing due to the formation of order crystalline structure but the exorbitant temperature would lead to thermal oxidation and brittleness for the fibers.
出处
《合成纤维》
CAS
2012年第10期5-11,共7页
Synthetic Fiber in China
关键词
芳砜纶
力学性能
热性能
结晶结构
热拉伸
aromatic polysulfonamide,mechanical property,thermal property,crystalline structure,heat-drawing
