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In our earlier contribution, it was shown that with the addition of 1 wt% functionalized multiwall carbon nanotube (f-MWNT), an unprecedented 152% increase in PP impact strength without a significant loss in stiffness and ductility can be achieved. In the context of these observations, this work examined the impact fracture mechanism of such PP/f-MWNT nanocomposite, in which the PP interphase was...
The structure of the interphase in polypropylene (PP)/multiwall carbon nanotube (MWNT) nanocomposite was characterized by thermal analysis and wide angle X-ray diffraction. The interphase was composed of non-covalently coated PP on acid functionalized MWNT (f-MWNT), where the volume of interphase increases with increased f-MWNT concentration from 1 wt% to 30 wt%. Larger lamella thickness, crystallinity,...
Multiwall carbon nanotubes (MWNT) have been functionalized using nitric acid. The functionalized MWNTs (f-MWNT) form stable dispersions in butanol, while as received nanotubes do not. The f-MWNTs/butanol dispersion was added with polypropylene (PP) or maleic anhydride grafted polypropylene (MA-g-PP) in xylene solution to form PP/f-MWNT and MA-g-PP/f-MWNT master batches, respectively. Both PP and MA-g-PP...
Polypropylene (PP)/carbon nanotube (CNT) nanocomposite studies have been extensively reported in the literature. Most of this previous work has been carried out by dispersing CNTs in PP matrix via melt processing, while only limited studies have been carried out where CNT dispersion in PP was achieved by solution processing. Here we report the melt processing of PP/multiwall carbon nanotubes (MWNT)...
Nitric acid treated single and multi wall carbon nanotubes (SWNT and MWNT) have been dispersed in polypropylene using maleic anhydride grafted polypropylene (MA-g-PP) and butanol/xylene solvent mixture. SWNT exfoliation was characterized by Raman and UV–vis–NIR spectroscopies. Evidence for hydrogen bonding between maleic anhydride grafted polypropylene and nitric acid treated nanotubes was obtained...
Crystallization behavior of melt-blended polypropylene (PP)/single wall carbon nanotube (SWNT) composites has been studied using optical microscopy and differential scanning calorimetry. Polypropylene containing 0.8wt% SWNT exhibits faster crystallization rate as compared to pure polypropylene. PP/SWNT fibers have been spun using typical polypropylene melt spinning conditions. The PP crystallite orientation...
Fibers from polypropylene and polypropylene/vapor grown nano carbon fiber composite have been spun using conventional melt spinning equipment. At 5wt% nano carbon fiber loading, modulus and compressive strength of polypropylene increased by 50 and 100%, respectively, and the nano carbon fibers exhibited good dispersion in the polypropylene matrix as observed by scanning electron microscopy.
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