滞后测量法在聚合物动态疲劳研究中的应用  

Application of hysteresis measurem ent method in study on dynamic fatigue of polymers

作　　者：邱桂学[1] 赵树高[1] 

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《合成橡胶工业》2004年第3期175-178,共4页China Synthetic Rubber Industry

基　　金：山东省优秀中青年科学家科研奖励基金(02BS052)

摘　　要：用滞后测量法考察了mPE和EPDM改性PP在不同的负荷方式下的动态力学性能随时间的连续变化,确定了在动态应力作用下可以用临界动态应力(σd)表征材料的疲劳极限。在低于σd的应力作用下,试样可以有较长的疲劳寿命(大于105次),而高于σd,试样的力学性能迅速降低。随着mPE和EPDM质量分数的增加,共混物的σd降低;mPE的结晶度增加则使共混物的σd增大,疲劳性能提高。相同密度的mPE和EPDM相比,PP/mPE共混物的疲劳性能优于PP/EPDM的。The hysteresis measurement method was introduced to investigate the continuous change of dynamic properties of EPDM and metallocene polyethylen e elastomer(mPE)mod-ified PP with the time at different lo ading patterns.In the case of dynamic loading,the dynamic load limit(σ d )could exactly characterize the fatigue limit of ma terials.At the load level lower thanσ d ,materials had a long fatigue life(more than 10 5 times),otherwise the mechanical properties of the materials decreased quickly.With the increase of mPE and EPDM con-tent,σ d of the blends decreased,the higher c rystallinity of mPE resulted in a biggerσ d ,which improved the fatigue property of the blends.A comparison of mPE and EPDM with the same density was made,and the result showed that the fatigue property of PP /mPE blend was better than that of PP /EPDM blend.

关 键 词：聚丙烯 弹性体 共混物 滞后测量法 动态实验 疲劳寿命 

分 类 号：TQ317.3[化学工程—高聚物工业]