期刊
POLYMER JOURNAL
卷 34, 期 3, 页码 125-131出版社
NATURE PUBLISHING GROUP
DOI: 10.1295/polymj.34.125
关键词
ultrahigh molecular weight polyethylene (UHMWPE); dynamic mechanical thermal analysis (DMTA); wide-angle x-ray diffraction (WAXS) microhardness
Three types of semicrystalline ultra high molecular weight polyethylene, obtained with amorphous SiO2-supported Ziegler-Natta catalyst systems modified by vanadium and titanium, have been studied by wide angle X-Ray scattering, dynamic mechanical thermal analysis and microhardness methods. In all the cases a significant amount of monoclinic modification is observed, which is estimated to be of the order of 10%. With increasing the degree of crystallinity and quantity of entanglements, storage modulus and alpha relaxation increase and gamma relaxation decreases. A weak beta relaxation occurs only in the sample obtained with vanadium catalytic systems. Microhardness measurements give the possibility of distinguishing the effect of crystallinity from the effect of entanglements: Vickers microhardness is sensitive predominately to crystalline phase, while total microhardness is sensitive also to the structural peculiarities in the amorphous phase.
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