挤出工艺条件对β成核剂改性PPR的影响  

Effect of extrusion processing conditions on modification of PPR by β-nucleating agent

作　　者：张世鑫[1] 王益龙[1] 何昌平[1] 

机构地区：[1]大连理工大学化工学院高分子材料系,辽宁省大连市116024

出　　处：《合成树脂及塑料》2015年第1期1-5,共5页China Synthetic Resin and Plastics

摘　　要：使用差示扫描量热仪、广角X射线衍射仪和偏光显微镜研究了不同挤出工艺条件下N,N′-二环己基对苯二甲酰胺(DCHT)对无规共聚聚丙烯(PPR)β成核效果的影响。结果表明:加入质量分数0.15%的DCHT会诱导PPR中部分α晶转变成β晶,使原来粗大的球晶转变成"花心"状晶,出现β晶(300)晶面的特征衍射峰;提高单螺杆挤出机螺筒温度或螺杆转速都会明显增强DCHT对PPR的β成核效果;使用双螺杆挤出机在螺杆转速较高时,挤出改性PPR的β晶相对含量较高;最优工艺条件为单螺杆挤出机料筒温度250℃、螺杆转速120 r/min,或双螺杆挤出机料筒温度230℃、螺杆转速170 r/min,此时改性PPR的β晶相对含量达45.0%以上,DCHT对PPR有较好的β成核作用。β-nucleation effect of N,N′-dicyclohesyl terephthalamide（DCHT） on polypropylene random copolymer（PPR） in different extrusion processing conditions was studied with differential scanning calorimetry （DSC）, wide angle X-ray diffraction（WAXD） and polarizing light microscope（PLM）. The results show that DCHT can induce partial α crystal in PPR convert into β crystal, and make original bulky spherulite change into flower-like crystal morphology when 0.15% by mass of DCHT is added into PPR, and consequently characterization diffraction peak of crystal face 300 of β crystal appears. DCHT enhances β-nucleation of PPR obviously when the barrel temperature or the screw speed of the single-screw extruder increases. The modified PPR has high β crystal relative content when the twin-screw extruder with high screw speed is used. The β crystal relative content of the modified PPR is over 45.0%, which means DCHT has good nucleation effect on PPR, under the optimal extrusion conditions including the barrel temperature of 250 ℃ and the screw speed of 120 r/min for the single-screw extruder, or the barrel temperature of 230 ℃ and the screw speed of 170 r/min for the twin-screw extruder.

关 键 词：无规共聚聚丙烯 N N′-二环己基对苯二甲酰胺 Β成核剂 

分 类 号：TQ316.6[化学工程—高聚物工业]