长碳链聚酰胺1012纤维在不同温度下的力学性能  

Mechanical properties of long carbon chain polyamide 1012 fiber at different temperature fields

作　　者：陈美玉 李立凤[1] 董侠 CHEN Meiyu;LI Lifeng;DONG Xia(School of Textile Science and Engineering,Xi′an Polytechnic University,Xi′an,Shaanxi 710048,China;Key Laboratory of Functional Textile Material and Product of the Ministry of Education,Xi′an Polytechnic University,Xi′an,Shaanxi 710048,China;Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Engineering Plastics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]西安工程大学纺织科学与工程学院,陕西西安710048 [2]西安工程大学功能性纺织材料及制品教育部重点实验室,陕西西安710048 [3]中国科学院化学研究所北京分子科学国家实验室,北京100190 [4]中国科学院工程塑料重点实验室,北京100190 [5]中国科学院大学,北京100049

出　　处：《纺织学报》2023年第11期9-18,共10页Journal of Textile Research

基　　金：国家重大研发计划重点专项(2017YFB0307604);中国科学院科技服务网络计划(STS)区域中心项目(KFJ-STS-QYZX-013)。

摘　　要：为探究长碳链聚酰胺1012(PA1012)纤维在极端环境应用的可能性,借助动态热机械分析仪、X射线衍射仪和万能材料试验机系统研究了不同牵伸比的PA1012全牵伸丝(FDY)和拉伸变形丝(DTY)在不同温度下的力学性能及其变化规律。结果表明:常温下,PA1012 FDY的初始模量、屈服比强度、屈服伸长率、断裂强度随牵伸比增加呈线性增强,断裂伸长率与牵伸比之间呈负指数关系;当牵伸比为1.3时,与PA1012 FDY相比,PA1012 DTY的初始模量下降57.47%,断裂强度下降2.24%,但断裂伸长率增加1.40%;在-70~120℃温度范围内,相同牵伸比的PA1012 FDY和DTY的力学性能随温度变化趋势与常温状态下相似;特别是在-70℃,当牵伸比为2.7时,PA1012 FDY的拉伸断裂强度高达6.04 cN/dtex,其断裂伸长率为9.13%,可见PA1012 FDY在极地寒冷地域具有潜在应用前景。Objective Preliminary industrial spinning trial suggested that long carbon chain polyamide 1012(PA1012)has good spinning performance.In order to further explore the application possibility of PA1012 fiber in the environment of extremely low and high temperatures,tensile mechanical property evolution of PA1012 fully-drawn yarn(FDY)and drawn and textured yarn(DTY)with different drawing ratios at different temperature fields were investigated.Method PA1012 resin chips were used as raw materials to prepare PA1012 FDY and DTY samples using a melting spinning machine.Differential scanning calorimetry(DSC)was adopted to test the basic thermal properties,and the dynamic thermomechanical properties of PA1012 fiber were analyzed by dynamic mechanical analysis(DMA).The tensile mechanical property evolution of PA1012 FDY and DTY with different drawing ratios of 1.3-2.7 at different temperature fields were investigated by universal testing machine and X-ray diffraction instrument.Results The glass transition temperature and melting temperature of PA1012 fiber were 65.6 and 188℃,respectively.The DMA test results revealed three loss peaks with different intensities appearing at 70.9,-3.6 and-56.0℃,corresponding to the α,β andγrelaxation of the PA1012 fiber(Fig.2).At room temperature,the tensile mechanical properties of PA1012 FDY with different drawing ratios were found similar.With the increase of tensile elongation,the tensile strength of PA1012 FDY showed a linear increase.When drawing to the yield point,a tensile platform area appeared,and showed that the higher the drawing ratio the shorter the platform area.As the tensile elongation increasing,the tensile strength continued to increase until fracture appeared(Fig.3).Furthermore,the initial modulus,yield strength,yielding elongation and breaking strength of PA1012 FDY demonstrated a positive linear correlation with the drawing ratio,and the breaking elongation correlated with the drawing ratio in a negative exponential relationship(Fig.4).By contrast,the initial mod

关 键 词：长碳链聚酰胺1012纤维 全牵伸丝 拉伸变形丝 牵伸比 拉伸力学性能 极端环境 

分 类 号：TS102.5[轻工技术与工程—纺织工程]