The result shows that sag resistances of the tubing resins have a close relationship with NMR relaxation properties. Resins with longer longitudinalrelaxationtime possess better sag resistances.
管材树脂的抗熔垂性能与其核磁迟豫特性紧密相关，好的抗熔垂性能对应更长的纵向迟豫时间。
2
There are two types of relaxation: longitudinalrelaxation, which is the time (T1) needed to align protons in a static magnetic field;