科研之友
微信
新浪微博
Facebook
分享链接
摘要
In this investigation, poly(lactic) acid (PLA)/multi-walled carbon nanotubes (CNTs) hybrids were prepared using a melt blending process. To increase the compatibility between CNTs and PLA, the surfaces of the CNTs were firstly pre-treated in acid solution (HNO(3)) to functionalize them with carboxylic groups (-COOH). Then, stearyl alcohol was grafted onto carboxylic groups using a dehydrating agent, N,N'-dicyclohexylcarbodiimide. Chemically modified CNTs (CNT-C18) were thus obtained. Therefore, modified carbon nanotubes (CNT-C18) dispersed excellently in organic solvents. PLA/CNTs nanocomposites were prepared by the melt-blending method. Experimental results reveal that the PLA/CNT-C18 nanocomposites that consisted of well-dispersed nanotubes exhibited enhanced thermal and mechanical properties. Adding 4 wt % CNT-C18 to a nanocomposite increased the storage modulus (E') at 40 degrees C by 17.8%, and the loss modulus (E '') at the glass transition temperature (T(g)) by 15.1%. Adding 3 wt % CNT-C18 also reduced the surface resistivity of the PLA nanocomposites from >10(16) Omega/cm(2) to 10(4) Omega/cm(2). Such PLA/CNT-C18 nanocomposites are highly efficient in anti-static agents and can be exploited in the outer coverings of electronic devices.
- 出版日期2011-4
