Effect of carbon nanotubes content on crystallization kinetics and morphology of polypropylene

Razavi‐Nouri, Mohammad; Ahangari, Morteza Ghorbanzadeh; Fereidoon, Abdolhossein; Jahanshahi, Mohsen

doi:10.1016/j.polymertesting.2008.10.001

Cited by 79 publications

(49 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect was more pronounced at low SWNT content, and the results published elsewhere in details. 27 Ziabicki [28][29][30] suggested that the kinetics of polymer phase transportation can be represented by a first-order kinetic equation such as…”

Section: Resultsmentioning

confidence: 99%

“…The trend of variation of E 0 with SWNT content at room temperature was exactly the same as we found for elastic modulus and published elsewhere. 27 Figure 4 shows the variation of mechanical loss factor (tan d) of PP and the nanocomposites as a function of temperature. The temperature of the peak maximum which is observed at about 10 C has generally been assigned to the T g of PP and is slightly affected by the inclusion of SWNT.…”

Section: Dynamic Mechanical Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Effect of carbon nanotubes on dynamic mechanical properties, TGA, and crystalline structure of polypropylene

Razavi‐Nouri

2011

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

This paper is devoted to the preparation of thermoplastic nanocomposites of polypropylene (PP) and different amounts of single-walled carbon nanotubes (SWNTs) in the range 0.25-2 wt %. The effect of SWNT content on the dynamic mechanical behavior, thermal degradation, crystalline structure, and the kinetic crystallizability of PP were studied. The results obtained from dynamic mechanical thermal analyzer (DMTA) showed that the maximum storage modulus was achieved when 1 wt % SWNT was added into the pristine polymer. Thermal stability of the nanocomposites was measured by thermogravimetric analyzer (TGA). From the TGA results, it was found that the weight fraction of PP which was located at the interface for the nanocomposite containing 0.5% SWNT was about 60%, and this value did not change much with the addition of higher amounts of SWNT. Moreover, the thickness of the interface between PP and SWNT was estimated to be of the order of 10 1 nm which is very close to the radii of gyration of PP molecular chains. Wide angle X-ray diffractometer (WAXD) was used to explore the crystalline structure of water and slow-cooled samples. It was found that the crystallization of PP in 040 lattice plane increased for the nanocomposites compared with PP for both cooling rates studied. It was also found that the kinetic crystallizability values were nearly the same for PP and the nanocomposites.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Dynamic Mechanical Behaviormentioning

confidence: 99%

Effect of carbon nanotubes on dynamic mechanical properties, TGA, and crystalline structure of polypropylene

Razavi‐Nouri

2011

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…[38,42,46,49] Wu et al [42] observed a reduction of the crystallinity as MWCNT content is increased: the degree of crystallinity passes from 46.72% for neat PCL to 36.32% at 2 wt.-% MWCNT and 32.66% at 5 wt.-%. In fact, our results of Table 1 and Figure 4 show a maximum of the degree of crystallinity for 0.5 wt.-% nanocomposite, indicating opposite trends below and above this concentration.…”

Section: Crystallization Behaviormentioning

confidence: 99%

Thermal and Viscoelastic Features of New Nanocomposites Based on a Hot‐Melt Adhesive Polyurethane and Multi‐Walled Carbon Nanotubes

Fernández

Landa

Muñoz

et al. 2010

Macro Materials & Eng

View full text Add to dashboard Cite

Novel nanocomposites prepared by melt mixing of MWCNTs in a hot‐melt adhesive PCL‐based polyurethane are investigated. The nucleating effect of MWCNTs and the confinement they cause to polymer chains are considered. The broadening of the glass transition is indicative of a growth of the immobilized amorphous fraction adhered to MWCNTs. In the molten state the formation of a combined polymer/MWCNT network is observed. Practical requisites of hot melt adhesives, such as adequate melting temperature, crystallization degree, and viscosity are preserved when MWCNTs are added. Improvement of strength at room temperature and welding rate during cooling, are observed.

show abstract

“…CNTs are compatible with biological tissues for scaffolding purposes and the charge carried by the nanotubes can be manipulated to control neurite outgrowth [36,37]. It has also been suggested that CNTs functionalized with growth factors, such as nerve growth factor or brain-derived neurotrophic factor, can stimulate growth of neurons on the nanotube scaffold [38][39][40]. In such application the toxicity of CNTs remains an issue that must be overcome [41,42].…”

Section: Challenge Referencesmentioning

confidence: 99%

Revolutionary Impact of Nanodrug Delivery on Neuroscience

Khanbabaie¹,

Jahanshahi²

2012

Current Neuropharmacology

Self Cite

View full text Add to dashboard Cite

Brain research is the most expanding interdisciplinary research that is using the state of the art techniques to overcome limitations in order to conduct more accurate and effective experiments. Drug delivery to the target site in the central nervous system (CNS) is one of the most difficult steps in neuroscience researches and therapies. Taking advantage of the nanoscale structure of neural cells (both neurons and glia); nanodrug delivery (second generation of biotechnological products) has a potential revolutionary impact into the basic understanding, visualization and therapeutic applications of neuroscience. Current review article firstly provides an overview of preparation and characterization, purification and separation, loading and delivering of nanodrugs. Different types of nanoparticle bioproducts and a number of methods for their fabrication and delivery systems including (carbon) nanotubes are explained. In the second part, neuroscience and nervous system drugs are deeply investigated. Different mechanisms in which nanoparticles enhance the uptake and clearance of molecules form cerebrospinal fluid (CSF) are discussed. The focus is on nanodrugs that are being used or have potential to improve neural researches, diagnosis and therapy of neurodegenerative disorders.

show abstract

Effect of carbon nanotubes content on crystallization kinetics and morphology of polypropylene

Cited by 79 publications

References 35 publications

Effect of carbon nanotubes on dynamic mechanical properties, TGA, and crystalline structure of polypropylene

Effect of carbon nanotubes on dynamic mechanical properties, TGA, and crystalline structure of polypropylene

Thermal and Viscoelastic Features of New Nanocomposites Based on a Hot‐Melt Adhesive Polyurethane and Multi‐Walled Carbon Nanotubes

Revolutionary Impact of Nanodrug Delivery on Neuroscience

Contact Info

Product

Resources

About