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通过ＤＳＣ、Ｘ－射线衍射、红外光谱及拉伸试验研究了ＨＤＰＥ与ＬＬＤＰＥ、ＨＤＰＥ与ＬＤＰＥ之间的晶相相容性．结果表明，链结构相近的ＨＤＰＥ和ＬＬＤＰＥ的晶相相容性好，能形成共晶；而链结构差异较大的ＨＤＰＥ和ＬＤＰＥ的晶相相容性较差，倾向于分别结晶，但有部分链段被对方的晶区夹持．不论是支化度大的ＬＤＰＥ链段插入以ＨＤＰＥ为主的晶区，还是支化度小的ＨＤＰＥ链段插入以ＬＤＰＥ为主的晶区，都可破坏晶区的规整性．共晶的形成使共混物的熔点、结晶度、晶粒体积等低于两组份的线性加和，而力学性能，尤其是断裂伸长率，则显著提高，呈协同效应．
The crystal phase compatibility between HDPE and LLDPE, HDPE and LDPE was studied by DSC, X-ray diffraction, infrared spectrum and tensile test. The results show that HDPE and LLDPE with similar chain structure have good phase compatibility and can form eutectic. However, HDPE and LDPE with large difference in chain structure have poorer crystal phase compatibility and tend to crystallize separately. However, Segment is the other side of the crystal area. Whether LDPE segment with large branching degree is inserted into HDPE-based crystal zone or HDPE segment with small degree of branching into LDPE-based crystal zone, the regularity of crystal zone can be destroyed. The formation of eutectic makes the melting point, crystallinity and grain volume of the blend lower than the linear addition of the two components, while the mechanical properties, especially the elongation at break, increase significantly and show a synergistic effect.