碳纳米管原位改性聚氨酯的研究

STUDY ON IN SITU MODIFICATION OF PUR WITH CARBON NANOTUBES

采用叠氮法将聚乙二醇(PEG)、季戊四醇(PE)分别接枝到多壁碳纳米管(MWNTs)上制得羟基化MWNTs,并利用羟基化MWNTs改性聚氨酯(PUR)。利用傅立叶红外光谱、拉曼光谱、X射线光电子能谱、差示扫描量热等方法对中间产物和最终产物进行了表征。研究表明,当MWNTs质量分数为0.1%时,相对于纯PUR,添加了未修饰MWNTs、PEG修饰MWNTs和PE修饰MWNTs的PUR,其拉伸强度分别提高了64.2%、80.2%、85.5%,断裂伸长率分别提高了108.4%、167.0%、127.3%。

Hydroxyl functionalized multi-walled carbon nanotubes （MWNTs） were prepared through the introduction of poly （ ethyl glycol） （PEG） or pentaerythritol（PE） onto the surface of MWNTs by means of azidization. PUR/MWNTs composites were prepared by in situ polymerization, in which hydroxyl functionalized MWNTs participated in the polymerization of PUR. The structures of the interim productions and the ultima productions were characterized by FTIR, Raman spectra, XPS and DSC. The results showed that the mechanical properties of PUR/MWNTs composites prepared with modified MWNTs enhanced evidently. When the unmodified MWNTs, modified MWNTs with PEG and modified MWNTs with PE of 0.1% were added, the tensile strength of PUR was increased by 64.2%, 80.2%, 85.5%, and the breaking elongation was increased by 108.4%, 167.0%, 127.3% respectively.