Cocontinuous phase morphology for an asymmetric composition of polypropylene/polyamide 6 blend by melt mixing of polypropylene with premelted polyamide 6/organoclay masterbatch

2011 ◽  
Vol 123 (2) ◽  
pp. 1218-1226 ◽  
Author(s):  
Li Wang ◽  
Zhao-Xia Guo ◽  
Jian Yu
Keyword(s):  
Polyamide 6 ◽  
Phase Morphology ◽  
Melt Mixing

scholarly journals Effect of Graphene Nanosheets on the Morphology, Crystallinity, and Thermal and Electrical Properties of Super Tough Polyamide 6 Using SEBS Compounds

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Farzaneh Alirezaei Hoor ◽  
Jalil Morshedian ◽  
Shervin Ahmadi ◽  
Mohammad Rakhshanfar ◽  
Alireza Bahramzadeh
Keyword(s):  
Electrical Properties ◽  
Carbon Black ◽  
Graphene Nanosheets ◽  
Polyamide 6 ◽  
Melt Mixing ◽  
Graphene Nanocomposites ◽  
Melt Compounding ◽  
Carbon Structures ◽  
Thermal And Electrical Properties ◽  
Amine Groups

Super tough polyamide 6 was prepared by using SEBS and effect of SEBS-g-MA as a compatibilizer of PA6/SEBS matrix on mechanical properties was investigated. Thus super tough polyamide 6/graphene nanocomposites were produced using graphene nanosheets (GNs) through the melt compounding method. To compare the effectiveness of graphene, effects of graphite and carbon black (the other carbon structures) are also studied on the same matrix. The effects of graphene on crystallinity, improvements of morphology, and thermal and electrical properties of the nanocomposites were researched and compared with similar samples of graphite and carbon black. Due to the reaction between the maleic anhydride groups of SEBS and amine groups of nylon chains during the melt mixing process, super tough polyamide 6 was produced with high impact and tensile strength. The most important results of this study can be noted as an increase in the electrical conductivity and thermal stability by adding graphene to PA6/SEBS blend. Also the effect of graphene compatibility on PA6/SEBS/SEBS-g-MA blend was investigated with studying morphology.

Miscibility and Phase Morphology of Polylactide/Poly(vinyl acetate-co-vinyl alcohol) Blends Obtained by Melt Mixing

2014 ◽  
Vol 53 (15) ◽  
pp. 1590-1597 ◽  
Author(s):  
Qingsheng Liu ◽  
Jizhong Jiang ◽  
Hongxia Zhang ◽  
Jincheng Wang ◽  
Xuming Li ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Phase Morphology ◽  
Melt Mixing

Assessment of New Composites Containing Polyamide-6 and Lead Monoxide as Shields against Ionizing Photonic Radiation based on Computational and Experimental Methods

2021 ◽  
Author(s):  
Shahryar Malekie ◽  
Hassan Shooli ◽  
Mohammad Amin Hosseini
Keyword(s):  
Energy Level ◽  
Energy Levels ◽  
Xrd Analysis ◽  
Polyamide 6 ◽  
Melt Mixing ◽  
X Ray ◽  
Weight Percentage ◽  
Lead Monoxide ◽  
Photon Sources ◽  
Different Temperatures

Abstract This study aimed to introduce new composites, containing polyamide-6 (PA6) and lead monoxide (PbO), to protect against ionizing photon sources used for diagnostic and therapeutic purposes. Five composites, containing various weight percentages of PbO filler (0, 5, 10, 20, and 50%), were developed in this study. Initially, the numerical attenuation value was estimated using XMuDat program by calculating the mass attenuation coefficients at different energy levels. Next, the samples were synthesized based on the melt-mixing method in a laboratory mixing extruder, and their characteristics were determined by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Finally, experimental radiation attenuation tests were carried out. Based on the SEM results, the acceptable filler weight percentage was up to 20%; however, substantial aggregates formation was observed at the highest weight percentage. The results of XRD analysis showed a higher tendency for crystallization by decreasing the amorphous area, while increasing the filler weight percentage. Moreover, the amount of mass loss was monitored at different temperatures, revealing that the filler incorporation improved the thermal durability of the samples. According to the radiation results, a good agreement was observed between the experimental and computational data, except when aggregates formation was substantial. According to the experimental data, by increasing the lead weight percentage from 0% (crude PA6) to 50%, the half-value layer decreased from 3.13 to 0.17 cm at an energy level of 59 keV and from 7.28 to 4.97 cm at an energy level of 662 keV. Considering these promising results, the applicability of PA6/PbO composites for protection against low- and medium-energy ionizing photon sources must be investigated in future studies.

Specific Interactions Induced Dispersion and Confinement of Multi-Walled Carbon Nanotubes in Co-continuous Polymer Blends

2008 ◽  
Vol 8 (4) ◽  
pp. 1867-1879 ◽  
Author(s):  
Suryasarathi Bose ◽  
Arup R. Bhattacharyya ◽  
Pravin V. Kodgire ◽  
Ajit R. Kulkarni ◽  
Ashok Misra
Keyword(s):  
Carbon Nanotubes ◽  
Percolation Threshold ◽  
Multiwall Carbon Nanotubes ◽  
Acrylonitrile Butadiene Styrene ◽  
Polyamide 6 ◽  
Strong Impact ◽  
Specific Interactions ◽  
Melt Mixing ◽  
Uniform Dispersion ◽  
High Dielectric

Multiwall carbon nanotubes (MWNT) were melt-mixed with 50/50 co-continuous blends of polyamide 6 (PA6) and acrylonitrile-butadiene-styrene (ABS). Blending sequence and moulding processes were found to have a strong impact on the conductivity of the blends with MWNT. Aggregated nature of the tubes, migration during processing and skin-core morphology generated during mould cooling step were found to be crucial parameters affecting the electrical conductivity of the blends. We report here the role of a reactive modifier: sodium salt of 6-amino hexanoic acid (Na-AHA) aiding in uniform dispersion of the MWNT in the 50/50 PA6/ABS blends and restricting the tubes utilizing specific interactions during melt-mixing in the PA6 phase in the blends. We further varied the MWNT to Na-AHA ratio from 1:1 to 1:15 to optimize the concentration of MWNT required in achieving lower electrical percolation threshold in co-continuous PA6/ABS blends. The associated percolation threshold was observed at ∼0.5 wt% MWNT with high dielectric constant.

Scratch and Wear Resistance of Polyamide 6 Reinforced with Multiwall Carbon Nanotubes

2008 ◽  
Vol 8 (6) ◽  
pp. 3176-3183 ◽  
Author(s):  
Luis F. Giraldo ◽  
Witold Brostow ◽  
Eric Devaux ◽  
Betty L. López ◽  
León D. Pérez
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Sliding Wear ◽  
Multiwall Carbon Nanotubes ◽  
Young Modulus ◽  
Tensile Tests ◽  
Polyamide 6 ◽  
Melt Mixing ◽  
Air Atmosphere ◽  
Multiwall Carbon

While carbon nanotubes have been used for a variety of purposes, it was not known whether they can improve tribological properties of polymers. Polyamide 6 (PA6) has been reinforced with 0.2, 0.5 and 1.0 wt% of multiwall carbon nanotubes (MWCNTs) by melt mixing process and characterized by scanning electron microscopy (SEM), transmission electron microscopy, thermogravimetric analysis (TGA), scratching, sliding wear and tensile testing. TGA results for the air atmosphere show that MWCNTs shift the onset of thermal degradation to higher temperatures. Sliding wear tests show that the penetration depth decreases as the concentration of carbon nanotubes increases. However, the viscoelastic healing is hampered by the MWCNTs presence and the residual depths increase at the same time. Narrower scratch groove widths are seen in SEM for composites with MWCNTs, and scratch hardness increases. Tensile tests show an increase of 27% in the Young modulus value upon addition of 1.0% of MWCNTs. The stress at yield is also higher for the nanocomposites.

Effect of various material parameters on barrier properties of high-density polyethylene/polyamide 6/clay nanocomposites

2016 ◽  
Vol 48 (8) ◽  
pp. 739-753
Author(s):  
Mehdi Moghri ◽  
Elena-Niculina Dragoi
Keyword(s):  
Differential Evolution ◽  
High Density Polyethylene ◽  
Mean Squared Error ◽  
Barrier Properties ◽  
Polyamide 6 ◽  
High Density ◽  
Clay Nanocomposites ◽  
Melt Mixing ◽  
Network Modelling ◽  
Local Search Procedure

In this work, the effect of four factors including the nanoclay (NC) content, polyamide 6 (PA-6) content, compatibilizer type, and amount, as material variables on barrier properties of different high-density polyethylene (HDPE)/PA-6/clay nanocomposites, was described. Response surface method was used as a tool for experimental design. Different PA-6/clay nanocomposites were prepared by melt mixing of PA-6 at different clay loadings using a corotating twin-screw extruder. Subsequently, different PA-6/NC compounds containing different amounts of clay were melt mixed with HDPE to produce blow-molded containers under fixed processing conditions. In order to model the permeability, a neural network modelling approach in combination with a modified version of differential evolution was employed. The differential evolution modifications included, among others, a local search procedure based on backpropagation. The best models determined had a mean squared error in the testing phase of less than 0.1 and an average relative error lower than 12.2%, the difference between experimental results and predictions being within an acceptable range. This indicates that the methodology used was able to efficiently model the considered process.

Mechanical and hygrothermal aging study on quaternary polyamide 6/maleated styrene-ethylene-butylenestyrene/ clay/short glass fiber hybrid composites

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Yonghong Rua ◽  
Sie Chin Tjong
Keyword(s):  
Glass Fiber ◽  
Tensile Ductility ◽  
Hybrid Composites ◽  
Polyamide 6 ◽  
Mechanical Tests ◽  
Melt Mixing ◽  
Hygrothermal Aging ◽  
Short Glass Fiber ◽  
Aging Study ◽  
Short Glass

AbstractElastomer toughened PA6 hybrids reinforced with short glass fiber and organoclay were fabricated by melt mixing and injection molding. The structure, mechanical and hygrothermal aging behaviors of such hybrids were investigated. XRD patterns showed the absence of clay diffraction peaks in low angle region. TEM observation showed that the organoclay platelets are fully exfoliated in the PA6 matrix of hybrids. Mechanical tests demonstrated that the incorporation of organoclay into PA6/SEBS-g-MA/SGF composite lead to a significant enhancement in the elastic modulus of hybrids. However, the clay additions reduced the tensile ductility and fracture toughness of hybrids. The tensile stiffness and strength of the clay reinforced hybrids deteriorated but the tensile ductility enhanced markedly upon exposure to hygrothermal aging.

Sign in / Sign up

Export Citation Format

Share Document