摘要
用哈克流变仪、红外光谱和元素分析等方法研究了丙烯酸 (AA)与高密度聚乙烯 (PE HD)在过氧化二异丙苯(DCP)引发下的熔融接枝反应 ,并将所得接枝物与纳米膨润土进行复合。结果表明 ,在PE HD中只加DCP时 ,由于发生交联反应而出现第二扭矩峰 ,并使平衡扭矩明显增加 ,熔点和结晶度降低。加入AA后 ,AA与PE HD发生熔融接枝反应 ,并抑制了PE HD自身的交联 ,从而使扭矩下降 ,熔点和结晶度部分恢复。此外 ,液体AA的加入大幅度降低了塑化阶段的最大扭矩。在AA含量低于 10 %时 ,随AA含量的增加 ,接枝率相应增加 ,接枝效率保持在 80 %以上 ;AA含量太多时易产生自聚 ,使接枝效率明显下降。在与膨润土进行复合时发现膨润土在接枝后的聚乙烯中的分散要优于纯聚乙烯。
Melt grafting reaction of high density polyethylene with acrylic acid was performed in Thermo Haake Rheomix.The extent of grafting was analyzed by FTIR and element analysis and thermal properties of PE-HD-g-AA were studied by DSC measurement.The change of torque indicated that the graft copolymerization existed during melt compounding.When AA content was less than 10 %,the extent of grafting increased with increasing content of AA,and the grafting efficiency maintained a high level of about 80 %.However,when AA content exceeded 10 %,the increment of the extent of grafting leveled off and the grafting efficiency decreased remarkably.The graft copolymer had better miscibility with nano-bentonite than pure PE-HD.
出处
《中国塑料》
CAS
CSCD
北大核心
2004年第2期26-30,共5页
China Plastics
关键词
高密度聚乙烯
丙烯酸
熔融
接枝共聚
膨润土
复合
high density polyethylene
acrylic acid
melting
graft copolymerization
bentonite
compounding
