摘要
通过熔融插层法制备了有机化蒙脱土(OMMT)/沥青复合材料,运用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和差示扫描量热仪(DSC)等手段对复合材料的结构进行了分析,探讨了OMMT作用于沥青的微观机理。研究结果显示:OMMT均匀分散于沥青中且随着OMMT掺量的增加,复合材料中蒙脱土片层间距逐渐增大,当掺量为9%时,层间距增大到4.35nm,OMMT/沥青复合材料形成的是一种稳定的插层型结构,且蒙脱土片层结构在熔融剪切作用下变得更加有序化;复合材料中蒙脱土在1038cm-1左右处的Si-O-Si的伸缩振动分裂为1033cm-1和1099cm-12个谱峰;复合材料的玻璃化转变温度、软化点及黏度随着OMMT掺量的增加而增大且均明显高于基质沥青,沥青的高温稳定性能显著提高。
Organo-montmorillonite（OMMT）/asphalt composite materials prepared by melt intercalation were characterized by Fourier transform infrared spectroscopy（FTIR）,X-ray diffraction（XRD） and differential scanning calorimeter（DSC）.The microcosmic mechanism of asphalt modified with organo-montmorillonite was studied.The results showed that OMMT was symmetrically dispersed into asphalt,and the lamella spacing of montmorillonite gradually augmented with the increasing of OMMT dosage.When the OMMT dosage was 9%,the interlayer spacing increased to 4.35 nm.OMMT/asphalt composite materials formed a stable intercalated structure,and under molten shearing,the lamella of montmorillonite became more orderly.Montmorillonite at 1038 cm^-1 for Si-O-Si stretching vibrations was split into 1 033 cm^-1 and 1 099 cm^-1.The vitrification temperature,softening point and viscosity of the composite materials were significantly higher than those of asphalt,and increased with the increasing of OMMT dosage.The high temperature properties of the modified asphalt were improved.
基金
国家自然科学基金资助项目(50773061)
关键词
沥青
有机化蒙脱土
熔融插层法
机理
asphalt
organo-montmorillonite
melt intercalation
mechanism
