反应挤出中PET相对分子质量的研究  

STUDY ON MOLECULAR WEIGHT OF PET DURING REACTIVE EXTRUSION PROCESSING

作　　者：王顶[1] 王益龙[1] 

机构地区：[1]大连理工大学化工学院高分子材料系,116012

出　　处：《现代塑料加工应用》2005年第2期6-9,共4页Modern Plastics Processing and Applications

摘　　要：用反应挤出机研究了聚对苯二甲酸乙二醇酯(PET)在熔融挤出过程中工艺条件和扩链剂用量对PET相对分子质量的影响。试验结果表明:降低反应段温度、提高真空度和增加螺杆转速可以有效地降低PET 分子链的断裂。使用反应挤出机,在反应段温度为260 ℃、真空度-0.1 MPa、螺杆转速45 r/min、扩链剂2,2′-双(2 -口恶唑啉)(简称双口恶唑啉)用量为0.4%时效果最好,可以使PET相对分子质量由挤出前的25 800 g/mol提高到32 000 g/mol。对口恶唑啉的结构和热谱研究表明,PET相对分子质量的提高是由于口恶唑啉与PET的端基发生了偶联反应。The effect of reactive processing conditions and the amount of extender-2,2′-bis(2-oxazoline) on molecular weight of PET was studied with the reactive extruder. The results showed that decreasing the temperature of the reactive zone, increasing the vacuum degree and the screw rotation speed of the extruder could reduce the chain degradation of PET. Under the conditions of temperature of 260 ℃,vacuum degree of -0.1 MPa, screw rotation speed of 45 rpm, the amount of extender of 0.4%, molecular weight of PET was increased quickly from 25 800 g/mol to 32 000 g/mol. The reason was that bisoxazoline reacted with the end group of PET.

关 键 词：相对分子质量 PET 聚对苯二甲酸乙二醇酯 反应挤出机 螺杆转速 工艺条件 挤出过程 试验结果 双噁唑啉 偶联反应 扩链剂 真空度 分子链 用量 温度 熔融 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]