Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 119, Issue 2, Pages 1081-1089Publisher
SPRINGER
DOI: 10.1007/s10973-014-4241-1
Keywords
Polyacrylonitrile; Amino-functionalized carbon nanotube; Composites; Non-isothermal cyclization kinetics; In situ polymerization
Funding
- National Basic Research Program of China [2011CB605602]
- Foundation of He'nan Educational Committee [13A430716]
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The non-isothermal cyclization kinetics of amino-functionalized carbon nanotubes (amino-CNTs)/polyacrylonitrile (PAN) composites was investigated using differential scanning calorimetry (DSC) in nitrogen atmosphere. The amino-CNTs/PAN composites were prepared by in situ polymerization under ultrasonication. The X-ray diffraction analysis showed that the composites had lower degree of crystallization compared with the neat PAN homopolymer. The morphology of composites suggested that the amino-CNTs had homogeneous dispersion in the PAN matrix. The Kissinger method and Crane method were used for describing the non-isothermal cyclization reaction of the neat PAN homopolymer and the amino-CNTs/PAN composites using DSC data with different heating rates. The results showed that the addition of amino-CNTs into the neat PAN homopolymer decreased the initial temperature and the peak temperature for the cyclization reaction. The amino-CNTs/PAN composites had higher activation energy than the neat PAN homopolymer, indicating that the presence of the amino-CNTs hindered the mobility of the PAN chain segments. The n-th order for the amino-CNTs/PAN composites is more close to one than that of the neat PAN homopolymer.
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