摘要
研究了LLDPE/HDPE、LLDPE/LDPE、HDPE/PP及HDPE/PP/EVA各共混体系的配比对拉伸性能的影响,并利用示差扫描量热计、毛细管流变仪分别对其中某些共混物的相容性及加工性能作了进一步探讨。结果表明,LLDPE/HDPE两组分能以任何配比互混,且配比为30/70时拉伸性能超过了纯组分,加工行为优于LLDPE;LLDPE/LDPE是不相容或存在极限相容性的多相共混物,其拉伸性能没有表现出强烈的协同效应,且配比低于40/60时,拉伸性能低于预料的迭加值;HDPE/PP是相容性很差的共混体系,其拉伸性能低于纯组分,在HDPE/PP共混物中加入EVA(乙烯-醋酸乙烯共聚物)后,其拉伸性能没有得到可望的改善,却降低了低剪切速率时的加工行为。
Mechanical properties, compatibility, and processibility of LLDPE/LDPE, LLDPE/HDPE, HDPE/PP, and HDPE/PP/EVA blends wereinvestigated with differential scanning calorimeter and capillaryrheometer. LLDPE/HDPE blend system appeared to be compatible inthe range of all compositions. Moreover, at the ratio of 30/70, tensilestrength of the blend was over either of the two pure components,and theprocessibility was superior to that of LLDPE. LLDPE/LDPE was anmulti-phase blend which is incompatible or showed critical compatibility.It did not show remarkable cooperation effect on tensile properties.when the content of LLDPE was below 40%, the mechanical propertieswere lower than those expected by addition rule. Blends of HDPE/PPdisplayed very poor compatibility. The mechanical properties werelower than those of pure polymers, However, the processibility of theblend with ratio of 10/90 was superior to that of pure components.Addition of EVA in HDPE/PP blend did not have expected enhancementon mechanical properties, but worsened processibility of HDPE/PPblends at lower shear rate.
出处
《现代塑料加工应用》
CAS
1989年第2期16-23,共8页
Modern Plastics Processing and Applications
