碳纳米管填充改性聚醚醚酮的热力学特性  

Thermo-Mechanical Properties of Polyethere the rketone Filledwith Carbon Manotube

作　　者：王瑞欣 王克俭[2] 李思涵 陈雅波 王志伟 楼子豪 WANG Ruixin;WANG Kejian;LI Sihan;CHEN Yabo;WANG Zhiwei;LOU Zihao(China Institute of Aeronautical Manufacturing Technology,Beijing 100024,China;Institute of Plastics Machinery and Plastics Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]北京化工大学,塑料机械及塑料工程研究所,北京100029

出　　处：《塑料》2024年第5期62-65,97,共5页Plastics

摘　　要：聚醚醚酮(PEEK)综合性能较好而得到广泛使用,经常受热力耦合作用,研究其热力学特性非常必要。热失重分析(TGA)测试表明,空气中520℃以上发生快速分解,先炭化再氧化燃烧。不同应变变形下的松弛曲线,初始应变越大,应力水平越高,松弛时应力下降越明显;温度越高,应力水平降低,但松弛应力幅度越大;在5%加载应变下,松弛行为随加载速度的增大而显著加快。在较低的加载速率下,应力水平较低,材料快速响应而应力松弛幅度大。在中高速加载时,响应应力却随加载速度提高却下降,且松弛应力幅度下降。非线性方程拟合发现,加载下松弛分为弹性受迫松弛、短时和长时的分子链塑化松弛。一定应力下,载荷越大,蠕变中应变水平越高,应变增长也越明显;温度越高,蠕变幅度增大。非线性拟合分析表明,加载下蠕变分为弹性受迫蠕变、短时和长时的塑化蠕变。Polyether ether ketone(PEEK)was widely used because of its excellent comprehensive performance,which was often subject to thermal mechanical coupling.TGA testing showed that decomposition begins at 520 C in air in which first carbonization was followed by oxidation combustion.The relaxation curves under different strain deformations showed that the larger the initial strain,the higher the stress level,and the more significant the decrease in stress during relaxation.The higher the temperature,the lower the stress level but the greater the relaxation stress amplitude.At 5%loading strain,the relaxation behavior slowed down with loading speed.At very low loading rates,the stress level was low since the material could respond in time while the stress relax ation amplitude was large.When loading at medium to high speeds,the response stress decreases with the increase of loading speed while the amplitude of relaxation stress decreases.N onlinear.equation ftting reveals that relaxation under loading can be divided into elastic forced relaxation,long plasticization relaxation of molecular chain and short one.Under a certain stress,the larger the load,the higher the strain level in creep,and the more obvious the strain growth.The higher the temperature,the greater the creep amplitude.Nonlinear ftting analysis showed that creep under loading could be divided into elastic forced creep,first-order plastic creep and second-order one.

关 键 词：聚醚醚酮 碳纳米管 填充改性 应力松弛 蠕变 

分 类 号：TQ362.5[化学工程]