摘要
DMA+1000动态力学分析仪广泛应用于热塑性与热固性塑料、橡胶等领域,主要用来测量黏弹性材料的力学性能与时间、温度或频率之间的关系,从而获得材料结构与分子运动的信息。测试模式主要有温度扫描、应力/应变扫描、蠕变/松弛扫描等模式,本项目首先在温度扫描的模式下,测试温度范围-40~70℃,最大力10 N,频率10 Hz,升温速率:2℃/min,静应变7%,动态应变0.25%,通过在室温(T_(0))以上把温控介质由液氮转换为空气,研究更换介质对0℃时的tanδ值、胶料的玻璃化转变温度Tg值以及60℃时的tanδ值尤其是60℃时的tanδ值的影响,研究得出更换介质对这三个值的影响范围均在统计学误差允许范围之内。另外,对介质切换的切换温度进行研究分析,通过对在T=T_(0)+3,T=T_(0)+5,T=T_(0)+8,T=T_(0)+10四个温度下进行空气切换研究得出在T=T_(0)+8进行空气的切换得出的试验曲线稳定性较好。
DMA+1000 dynamic mechanical analyzer is widely used in the fields of thermoplastic and thermosetting plastics,rubber,etc.It is mainly used to measure the relationship between the mechanical properties of viscoelastic materials and time,temperature,or frequency,in order to obtain information on material structure and molecular motion.The testing modes mainly include temperature scanning,stress/strain scanning,creep/relaxation scanning,and other modes.Firstly,in the temperature scanning mode,the testing conditions for this project are as follows:testing temperature range-40~70℃,maximum force of 10 N,frequency of 10 Hz,heating rate:2℃/min,static strain of 7%,dynamic strain of 0.25%.By converting the temperature control medium from liquid nitrogen to air above room temperature(T_(0)),this project investigated the effect of changing the medium on the tanδvalue at 0℃,the Tg value of the glass transition temperature of the adhesive,and the tanδvalue at 60℃.The study found that the impact range of changing the medium on these three values is within the allowable range of statistical error.In addition,research and analysis were conducted on the switching temperature of the medium.Through the study of air switching at four temperatures:T=T_(0)+3,T=T_(0)+5,T=T_(0)+8,and T=T_(0)+10,it was found that the experimental curve had good stability when conducting air cutting at T=T_(0)+8.
作者
沈红娜
安程
陈雷
宫岩松
李海艳
Shen Hongna;An Cheng;Chen Lei;Gong Yansong;Li Haiyan(Shandong Fengyuan Tire Manufacturing Co.LTD.,Zaozhuang 277300,Shandong,China)
出处
《橡塑技术与装备》
CAS
2024年第5期47-51,共5页
China Rubber/Plastics Technology and Equipment
关键词
温控介质
液氮
空气
影响
temperature controlled medium
liquid nitrogen
air
influence
