Controlling bubble density in MWNT/polymer nanocomposite foams by MWNT surface modification

2012 ◽  
Vol 72 (2) ◽  
pp. 190-196 ◽  
Author(s):  
Limeng Chen ◽  
Behic K. Goren ◽  
Rahmi Ozisik ◽  
Linda S. Schadler
Keyword(s):  
Surface Modification ◽  
Polymer Nanocomposite ◽  
Nanocomposite Foams ◽  
Bubble Density

A Comprehensive Review on Carbon-Based Polymer Nanocomposite Foams as Electromagnetic Interference Shields and Piezoresistive Sensors

2020 ◽  
Vol 2 (8) ◽  
pp. 2318-2350 ◽  
Author(s):  
Mahyar Panahi-Sarmad ◽  
Mina Noroozi ◽  
Mahbod Abrisham ◽  
Siroos Eghbalinia ◽  
Fatemeh Teimoury ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Polymer Nanocomposite ◽  
Comprehensive Review ◽  
Piezoresistive Sensors ◽  
Nanocomposite Foams ◽  
Carbon Based

Polymer Nanocomposite Foams Prepared by Supercritical Fluid Foaming Technology

2002 ◽  
Vol 733 ◽  
Author(s):  
L. James Lee ◽  
Changchun Zeng ◽  
Xiangmin Han ◽  
David L. Tomasko ◽  
Kurt W. Koelling
Keyword(s):  
Cell Size ◽  
Cell Density ◽  
Polymer Nanocomposite ◽  
Extrusion Process ◽  
Clay Nanocomposites ◽  
Good Surface ◽  
Nanocomposite Foams ◽  
Continuous Extrusion ◽  
Foaming Technology ◽  
Reduce Cell Size

AbstractPolystyrene (PS) clay nanocomposites were synthesized and used to prepare foams in both batch and continuous extrusion process. It was found that the addition of a small amount of clay could greatly reduce cell size and increase cell density. Once exfoliated, the nanocomposite foam exhibits the highest cell density and the smallest cell size at the same particle concentration. Exfoliated microcellular nanocomposite foams with good surface quality was successfully produced using supercritical carbon dioxide.

Diffusion of CO2 in Polymer Nanocomposites Containing Different Types of Carbon Nanoparticles for Solid-State Microcellular Foaming Applications

2013 ◽  
Vol 26 ◽  
pp. 63-74 ◽  
Author(s):  
Marcelo Antunes ◽  
Vera Realinho ◽  
Gabriel Gedler ◽  
David Arencón ◽  
Jose Ignacio Velasco
Keyword(s):  
Carbon Nanoparticles ◽  
Polymer Nanocomposite ◽  
Amorphous Polymers ◽  
Carbon Nanofibres ◽  
Nucleation Effect ◽  
Microcellular Foaming ◽  
Cell Nucleation ◽  
Nanocomposite Foams ◽  
Electrical Conductivities ◽  
Different Types

This work considers the study of the diffusion of carbon dioxide in polypropylene and amorphous polymers containing carbon nanoparticles, particularly carbon nanofibres and graphene, as well as nanoclays, to be used in microcellular foaming. The diffusion of CO2 out and into the nanocomposites was studied during high pressure CO2 dissolution, as the amount of CO2 dissolved into the nanocomposite and CO2 desorption rate are crucial in order to have a proper control of foaming. Comparatively, platelet-like nanoparticles slowed down the desorption of CO2 out of the nanocomposites by means of a physical barrier effect, enabling a higher concentration of CO2 to remain in the polymer and be used in foaming. As a consequence of the higher amount of CO2 retained in the polymer and the cell nucleation effect promoted by the nanoparticles, polymer nanocomposite foams presented finer microcellular structures, in the case of PMMA even sub-microcellular, and higher specific moduli and electrical conductivities when compared to their pure counterparts.

Polymer nanocomposite foams

2005 ◽  
Vol 65 (15-16) ◽  
pp. 2344-2363 ◽  
Author(s):  
L LEE ◽  
C ZENG ◽  
X CAO ◽  
X HAN ◽  
J SHEN ◽  
...  
Keyword(s):  
Polymer Nanocomposite ◽  
Nanocomposite Foams

scholarly journals Bulk-Surface Modification of Nanoparticles for Developing Highly-Crosslinked Polymer Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1820 ◽  
Author(s):  
Maryam Jouyandeh ◽  
Mohammad Reza Ganjali ◽  
Mustafa Aghazadeh ◽  
Sajjad Habibzadeh ◽  
Krzysztof Formela ◽  
...  
Keyword(s):  
Surface Modification ◽  
Polymer Nanocomposite ◽  
Isoconversional Methods ◽  
Heating Rates ◽  
Epoxy Nanocomposites ◽  
Scanning Calorimetry ◽  
Cure Reaction ◽  
Crosslinked Polymer ◽  
Diffusion Controlled ◽  
Bulk Modification

Surface modification of nanoparticles with functional molecules has become a routine method to compensate for diffusion-controlled crosslinking of thermoset polymer composites at late stages of crosslinking, while bulk modification has not carefully been discussed. In this work, a highly-crosslinked model polymer nanocomposite based on epoxy and surface-bulk functionalized magnetic nanoparticles (MNPs) was developed. MNPs were synthesized electrochemically, and then polyethylene glycol (PEG) surface-functionalized (PEG-MNPs) and PEG-functionalized cobalt-doped (Co-PEG-MNPs) particles were developed and used in nanocomposite preparation. Various analyses including field-emission scanning electron microscopy, Fourier-transform infrared spectrophotometry (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) were employed in characterization of surface and bulk of PEG-MNPs and Co-PEG-MNPs. Epoxy nanocomposites including the aforementioned MNPs were prepared and analyzed by nonisothermal differential scanning calorimetry (DSC) to study their curing potential in epoxy/amine system. Analyses based on Cure Index revealed that incorporation of 0.1 wt.% of Co-PEG-MNPs into epoxy led to Excellent cure at all heating rates, which uncovered the assistance of bulk modification of nanoparticles to the crosslinking of model epoxy nanocomposites. Isoconversional methods revealed higher activation energy for the completely crosslinked epoxy/Co-PEG-MNPs nanocomposite compared to the neat epoxy. The kinetic model based on isoconversional methods was verified by the experimental rate of cure reaction.

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