PA66/PET共混物的结晶行为

吴国金*　潘恩黎 (南京化工大学高分子系,南京,210009)

摘　要:　用DSC分析方法研究了PA66/PET共混物的结晶行为,结果表明,两种共混物配比与相容剂种类对其结晶行为有着显著的影响。当共混物中PET含量较低,融体冷却时,先固化的PET在PA66连续相中具有成核剂的作用,加快了结晶速度,在有些相容剂存在下还增加了结晶度。

关键词　PA66　PET　结晶作用　相容剂　聚合物共混物

中图分类号　O 631

PA66和PET均是结晶性聚合物,其结晶行为至今对合金的加工过程及制品的性能指标至关重要。对此类合金的结晶性能研究较少,1982年Kamal等[1]曾对PA66/PET热熔融共混物结晶性能作过DSC分析,认为当共混物中PA<40%(质量百分数,下同)时,PA对PET的结晶起到异相成核剂的作用,加快了PET的结晶速度,提高了结晶度。1996年AN等[2]用WAXD考察了PA6/PBT和PA6/PBT/E-44两种共混体系的X射线衍射图,未发现两者的区别。本文应用DSC分析研究不同组成的PA66/PET共混物结晶行为,考察了多种相容剂对共混物结晶性能的影响。从升温曲线获得共混物的冷结晶峰温Tc和结晶熔融温度Tm及相应的热焓△Hc和△Hm,从降温曲线获得其熔融结晶峰温Tc′和热焓△Hc′,明显地观测到:共混物组成和不同类型的反应型增容剂对共混物的结晶行为有着显著的差别。

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SOME CRYSTALLIZING BEHAVIORS OF PA66/PET BLENDS

Wu Guojin　Pan Enli（ Department of Polymer, Nanjing University of Chemical Technology,Nanjing,210009,China）

Abstract　

The crystallization of PA66/PET blends with different PET contents and compatibilizers was studied by DSC method. The results showed that the effect of blend composition and compatibilizers on crystallizing behaviors was remarkable. At low concentration of PET, PA66 was a continuous phase, the early solidified PET act as a nucleating agent, thereby increasing the rate of crystallinity and sometimes increasing degree of crystallinity determining different compatibilizers used. However, at high concentration of solidified PET, the mobility of PA66 chain was restricted, thereby leading to a lower degree of crystallinity.

Keywords　PA66　PET　crystallizing　compatibilizer　polymer blend
 

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