Citation: Xin-hua Jia, Rong-jun Qu, Chang-mei Sun, Kai An, Rao Fu, Ying-lei Mu. Preparation and Properties of Multiwalled Carbon Nanotubes Modified by Oligo(para-phenylene terephthanlamide)[J]. Acta Polymerica Sinica, ;2018, 0(7): 878-885. doi: 10.11777/j.issn1000-3304.2018.17327 shu

Preparation and Properties of Multiwalled Carbon Nanotubes Modified by Oligo(para-phenylene terephthanlamide)

Department of Chemistry and Material Science, Ludong University, Yantai 264025

Corresponding author: Rong-jun Qu, rongjunqu@sohu.com Chang-mei Sun, sunchangmei0535@126.com
Received Date: 10 December 2017
Available Online: 25 April 2018

Carbon nanotubes have excellent mechanical properties. However, their application in polymer composites is limited due to their easy aggregation and inert surface. In order to improve their dispersion and surface performance, multiwalled carbon nanotubes (MWCNTs), chemically modified using oligo(para-phenylene terephthanlamide) and denoted as PPTA-MWCNTs-x, were prepared, and used to investigate the reinforcement of the mechanical properties of poly(vinyl chloride) (PVC) composite films. PPTA-MWCNTs-x was obtained by the reaction of carboxymethyl multiwalled carbon nanotubes (MWCNTs-COOH) with amino-terminal para-phenylene terephthanlamide oligomers (PPTA). A typical procedure is as follows: firstly, a desired amount of MWCNTs-COOH was suspended in N-methyl methyl pyrrolidone (NMP), and the suspension was sonicated to form a homogenous dark-brown solution. In a separated experiment, amino-terminal PPTA oligomer was prepared by reacting PDA with TPC at a ratio of 1.5 to 1 in NMP. The above MWCNTs-COOH dispersion was poured into the PPTA solution just prepared, and the mixture was stirred at desired temperature for a given time in the presence of catalyst of N,N-dicyclohexylcarbodiimde under nitrogen atmosphere. The solid substance obtained was filtered and the product PPTA-MWCNTs-x was obtained. Transmission electron microscopy (TEM), scanning electron microscope (SEM), and Fourier transform infrared spectrometer (FTIR) were used to characterize the structure and the morphology of PPTA-MWCNTs-x. The results of FTIR analysis demonstrated that PPTA oligomers were successfully grafted on the surface of PPTA-MWCNTs-x. The dispersion stability of PPTA-MWCNTs-x in some solvents, such as NMP, dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) and ethanol, was investigated. The results showed that the stability of PPTA-MWCNTs-x in DMF and DMSO was higher than that in NMP and ethanol, and the time, that the dispersion remained stable without phase separation, could reach 216 and 240 h, respectively. PVC was chosen as model polymer to investigate the reinforcement effect of PPTA-MWCNTs-x. PVC composite films were prepared by solvent casting using DMF as solvent. Optical microscope images showed that PPTA-MWCNTs-x was more homogeneously dispersed than MWCNTs-COOH in the composite films. The reinforcement results demonstrated that the maximum Young’s modulus, strength and strain of PPTA-MWCNTs-x/PVC composite films increased by 44.4%, 79.4%, and 203.6%, respectively, in comparison to those values from pure PVC films, while those of MWCNTs-COOH/PVC composite films increased by 29.7%, 41.6%, and 104.2%, respectively. Obviously, the MWCNTs modified by oligo-PPTA can significantly improve the mechanical properties of PVC composite films. Based on the observations, PPTA-MWCNTs-x has great potential to be used as reinforcing polymer filler in the future.
- Multiwalled carbon nanotubes,
- Oligo-(p-phenylene terephthalamide),
- Chemical modification,
- PVC composites
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