【摘要】 研究了几种极性和非极性弹性体对HDPE的结晶行为、耐环境应力开裂性能及力学性能的影响,并与LLDPE的影响作了对比。结果表明,在结晶过程中,弹性体分子链中的部分健段串入HDPE晶区,干扰了其结晶过程,使结晶温度和结晶度下降。由于弹性体分子把晶区与晶区、晶区与非晶区连接起来,强化了非晶区和界面区,从而大大地提高了HDPE的性能。加入5％(质量)弹性体可使HDPE的耐环境应力开裂性能和断裂伸长率成倍增长,拉伸强度基本不变。在这些弹性体中,与HDPE相容性较好的EVA、NR、SBS等弹性体的改性效果最佳,而NBR,CR等极性弹性体虽与HDPE的相容性较差,但也有较好的改性效果。更多还原

【Abstract】 The crystallization behaviors of the blends of HOPE and several elastomers (EVA , CPE , SBS , NR , SBR , IIR , BR ,CR and NBR )with mass ratio 100/5 were studied . The influences of these elastomers on environment stress cracking resistance ( ESCR ) and mechanical properties of HDPE were investigated and compared with those of LLDPE . The crystallization process of the blends were studied by differential scanning calorimetry (DSC). The results summarized showed that the crystalline temperature andcrystallinity of these blends were lower than those of pure HDPE . Addition of the elastomers increased greatly the ESCR and the elongation at break of HDPE , while tensile strength maintained .The effects of most unpolarized elastomers were better than LLDPE . Besides , polarized elastomers had also modification effect.更多还原