碳纳米管的功能化处理及聚己二酸-1,3-丙二醇-羟基碳纳米管共聚物的制备及性能研究

Functionalization of Carbon Nanotubes and Preparation and Properties of the Poly(hydroxyl carbon nanotubes-1,6-hexanedioic acid1,3-propylene glycol) Copolymer

碳纳米管在材料科学的诸多领域都显示出了优良的物理和化学性能,已成为纳米科技的重要组成部分。本实验首先对碳纳米管进行了酸化处理,使其表面带有大量的羧基和羟基,有利于进一步的聚合反应。然后采用原位聚合法,在缩聚反应体系中分别加入不同质量分数的带有羟基的多壁碳纳米管,合成聚已二酸-1,3-丙二醇酯-羟基碳纳米管共聚物,并分析了不同质量分数缩聚催化剂对缩聚反应的影响。最后,分别采用透射电镜(TEM)、红外光谱(FT-IR)、X射线衍射、差示扫描量热分析(DSC)等一系列测试手段对缩聚产物的结构和性能进行了分析。测试结果表明,随着碳纳米管质量分数的增加,缩聚产物的熔融温度逐渐增加,结晶度呈现先增大后减小的规律。实验还验证了钛酸正丁酯是本缩聚反应良好的催化剂,质量分数为0.3%为反应的最佳用量,得到的缩聚产物结晶度最大。

Carbon nanotubes （CNTs） have been proven to possess exotic physical and chemical properties in se- veral fields of material science and are major component of nanoscience and technology. The multi-wall carbon nanotubes （MWNT） were treated with the mixture of sulfuric acid and nitric acid. A lot of hydroxyl and carboxyl were formed on the surface of MWNT. A series of polycondensate of poly（hydroxyl carbon nanotubes-1,6-hexanedioic acid-l, 3-propy- lene glycol） was prepared by in situ polymerization by adding the different contents of hydroxyl carbon nanotubes to sys- tem. The effects of catalyzer content on polycondensation reaction have been systematically studied. The structural and properties of polycondensates have been investigated by using transmission electron microscope （TEM）, infrared spec- troscopic analysis （IR）, X-ray diffraction （XRD）, differential scanning calorimetry （DSC）. The results show that the melting temperatures of polymer were heightened as the content of hydroxyl carbon nanotubes increased. The degree of crystallization enhanced in the beginning then reduced. Butyltitanate is an excellent catalyzer for this polycondensation reaction. The crystallinity arrives its maximum when the content of catalyzer is 0.3%.