摘要
选用有机季鏻盐作为插层剂对黏土进行有机化插层改性,制备出有机黏土,通过熔融插层法制备聚丙烯/有机黏土纳米复合材料.XRD表明有机季鏻盐改性的黏土与聚丙烯形成结构为剥离型与插层型并存的纳米复合材料.利用DSC研究了纳米复合材料的熔融过程,结果显示有机黏土对聚丙烯的结晶度影响不明显.XRD和DSC的研究均表明,有机黏土可以诱发聚丙烯产生不常见的γ晶型.当黏土含量为5 wt%时,γ晶型占整个结晶部分的12%左右.
The Organo-Clay was prepared by alkyl phosphonium ions treating of Na-montmorillonite.The X-ray diffraction（XRD） patterns of Na-Clay and Organo-Clay shows that the position of the（001） plane diffraction peak of the Na-Clay appears around 5.94°,corresponding to the interlayer distance（d） of 1.48 nm calculated from the Bragg law,and the position of the（001） plane diffraction peak of the Org-Clay appears around 4.99°,d = 1.78 nm.The result proves that the alkyl phosphonium are intercalated into the galleries of the clay layers.The polypropylene（PP）/Org-Clay nanocomposites were prepared by melt intercalation and XRD and transmission electron microscopy（TEM） both indicated that PP chains could be intercalated into the interlayer of the Org-Clay.The nanocomposites possess exfoliation structure and intercalation structure.The process of melting for PP/Org-Clay nanocomposites were studied with differential scanning calorimetry（DSC）,and the result indicted that the addition of the Org-Clay had hardly effect on the degree of crystallization for PP.XRD results shows the position of the γ-PP（130） plane diffraction peak of the PP/Org-Clay nanocomposites appears around 19.8°and DSC heating cuvers of PP /Org-Clay nanocomposites at speed of 5 K/min revealed that the γ-PP melt peak of the PP/Org-Clay nanocomposites appearing around 149℃.It can inferred that the Org-Clay may promote the formation of γ-phase PP crystallites in the PP /Org-clay.When adding 5 wt% Org-Clay,the mass fraction of γ-phase PP is about 12%.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2010年第10期1199-1203,共5页
Acta Polymerica Sinica
关键词
聚丙烯
季鏻盐
黏土
γ晶
Polypropylene
Phosphonium
Clay
γ-Phase
