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Abstract  

The effect of four nucleating agents on the crystallization of isotactic polypropylene (iPP) was studied by differential scanning calorimetry (DSC) under isothermal and non-isothermal conditions. The nucleating agents are: carbon nanofibers (CNF), carbon nanotubes (CNT), lithium benzoate and dimethyl-benzylidene sorbitol. Avramișs model is used to analyze the isothermal crystallization kinetics of iPP. Based on the increase in crystallization temperature (T c) and the decrease in half-life time (τ½) for crystallization, the most efficient nucleating agents are the CNF and CNT, at concentrations as low as 0.001 mass%. Sorbitol and lithium benzoate show to be less efficient, while the sorbitol needs to be present at concentrations above 0.05 mass% to even act as nucleating agent.

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Introduction The carbon nanofibers not only have a low-density, high modulus, high strength and high electrical conductivity and thermal stability, and other characteristics, but also have a very small number of defects, aspect

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Introduction Since Beyer initiated the use of carbon nanotubes in fire retardant polymeric materials [ 1 ], carbon nanoadditives, including carbon nanotubes, carbon nanofibers and carbon black, have been studied systematically

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.2%) of freezing of cyclohexane was realized experimentally by introducing 2 wt% CuO nanoparticles. Cui et al. [ 18 ] obtained that both carbon nanofiber and carbon nanotube could improve the thermal conductivities of soy wax and paraffin wax. Liu et al

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catalytic properties of carbon nanofiber-supported Pt, Pd, Ru monometallic particles in the CWAO of phenol in a continuous-flow trickle-bed reactor. p -Hydroxybenzoic acid ( p -HBZ) was taken as a model molecule representative of phenolic pollutants which

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. 8. Xie , HF , Liu , BH 2005 Cure kinetics study of carbon nanofibers/epoxy composites by isothermal DSC . J Appl Polym Sci 96 : 329 – 335 10.1002/app.21415 . 9

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.11.017 . 7. Im , JS , Park , SJ , Kim , TJ , Kim , YH , Lee , YS 2008 The study of controlling pore size on electrospun carbon nanofibers for hydrogen adsorption . J Colloid Interface Sci 318 1 42 – 49 10.1016/j.jcis.2007

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