Preparation and properties of styrene-ethylene-butylene-styrene block copolymer/clay nanocomposites: I. Effect of clay content and compatibilizer types

2008 ◽  
Vol 57 (3) ◽  
pp. 515-522 ◽  
Author(s):  
Wen-Chih Chen ◽  
Sun-Mou Lai ◽  
Chun-Ming Chen
Keyword(s):  
Block Copolymer ◽  
Clay Content ◽  
Clay Nanocomposites

PBT/Brazilian Clay Nanocomposites Prepared by Melt Intercalation: Effects of Organophilic Clay Content and Ionizing Radiation Treatment

2014 ◽  
pp. 33-44
Author(s):  
Mariana N. Sartori ◽  
Maiara S. Ferreira ◽  
Francisco R. Valenzuela Díaz ◽  
Vijaya K. Rangari ◽  
Shaik Jeelani ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Radiation Treatment ◽  
Clay Content ◽  
Clay Nanocomposites ◽  
Melt Intercalation ◽  
Organophilic Clay

Effect of Clay on the Properties of Polyoxymethylene/Clay Nanocomposites

2012 ◽  
Vol 488-489 ◽  
pp. 82-86 ◽  
Author(s):  
Sirirat Wacharawichanant ◽  
Paramaporn Sahapaibounkit ◽  
Unchana Saeueng
Keyword(s):  
Filler Content ◽  
Clay Content ◽  
Morphological Properties ◽  
Clay Nanocomposites ◽  
Clay Surface ◽  
Degradation Temperature ◽  
Surface Modified ◽  
The Impact ◽  
Thermal Stability Of ◽  
Thermal Degradation Temperature

This work investigated the effect of montmorillonite clay surface modified with 25-30 wt% trimethyl stearyl ammonium (clay) on mechanical, thermal and morphological properties of polyoxymethylene (POM)/clay nanocomposites were investigated. The results showed that POM/clay nanocomposites could maintain or decrease their tensile strength for a certain clay loading range. The Young’s modulus of the nanocomposites increased by adding clay in a range of 0.5-4 wt% while the impact strength showed an increase in a range of 0.5-2 wt%. The percent strain at break of the nanocomposites decreased with increasing filler content. The thermal degradation temperature decreased with an increase of clay content thus the addition of clay did not improve the thermal stability of POM. The microstructure of neat POM and POM/clay nanocomposites was observed that the dispersion of clay was a good in POM matrix at low clay content. The nanocomposites formed the intercalated structure with clay, and the intercalated clay stacks were distributed uniformly in the nanocomposite. The increase of clay content observed increasing of brittleness in POM/clay nanocomposites.

Nonlinear interphase effects on plastic hardening of nylon 6/clay nanocomposites: A computational stochastic analysis

2019 ◽  
Vol 54 (6) ◽  
pp. 753-763
Author(s):  
Vahid Yaghoubi ◽  
Mohammad Silani ◽  
Hossein Zolfaghari ◽  
Mostafa Jamshidian ◽  
Timon Rabczuk
Keyword(s):  
Stochastic Analysis ◽  
Uncertainty Propagation ◽  
Clay Content ◽  
Latin Hypercube Sampling ◽  
Information Criterion ◽  
Nylon 6 ◽  
Clay Nanocomposites ◽  
Chi Square ◽  
Hardening Modulus ◽  
Plastic Hardening

In this paper, the nonlinear effect of interphase properties on the macroscopic plastic response of nylon 6/clay nanocomposites is investigated by applying a stochastic analysis on a multiscale computational model of nanocomposites. The mechanical behavior of interphase is described with respect to that of the matrix by a weakening coefficient. The interphase thickness and properties are considered as the stochastic inputs and the hardening modulus and hardening exponent describing the plastic hardening characteristics of the nanocomposite are the random outputs. The stochastic analysis consists of three procedures including (i) model selection using Akaike information criterion, (ii) uncertainty propagation using Latin Hypercube sampling in conjunction with chi-square test, and (iii) sensitivity analysis using Sobol indices. The results indicate that the exponential hardening model best describes the flow stress–plastic strain response of the nanocomposite. It is also shown that increasing the clay content generally increases the plastic hardening rate of the nanocomposite up to 4% clay content. Besides, the hardening characteristics of the nanocomposite are more sensitive to the weakening coefficient than the interphase thickness.

Structure and properties of styrene-butadiene rubber/ pristine clay nanocomposites prepared by latex compounding method

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Mahdi Abdollahi ◽  
Ali Rahmatpour ◽  
Jamal Aalaie ◽  
Homayon Hossein Khanli
Keyword(s):  
Mechanical Properties ◽  
Layered Silicate ◽  
Clay Content ◽  
Mechanical Tests ◽  
Styrene Butadiene Rubber ◽  
Clay Nanocomposites ◽  
Butadiene Rubber ◽  
Initial Modulus ◽  
Elastic Responses ◽  
Styrene Butadiene

AbstractStyrene- butadiene rubber (SBR)/ clay nanocomposites were prepared by mixing the SBR latex with aqueous clay dispersion and co-coagulating the mixture. Tapping mode AFM and XRD were applied to characterize the structure of nanocomposites. It was found that fully exfoliated structure could be obtained by this method only when the low loading of layered silicate (< 10 phr) is used. With increasing the clay content, both non-exfoliated (stacked layers) and exfoliated structures can be observed simultaneously in the nanocomposites. The results of mechanical tests on the vulcanized pure SBR and SBR/ clay nanocomposites showed that the nanocomposites presents better mechanical properties than clayfree SBR vulcanizate. Furthermore, initial modulus, tensile strength, tensile strain at break, hardness (shore A) and tear strength increased with increasing the clay content, indicating the nanoreinforcement effect of clay on the mechanical properties of SBR/ clay nanocomposites. Compared to the clay free SBR vulcanizate, the nanocomposite vulcanizates exhibit a lower tanδ peak value, higher storage modulus and higher tanδ value at the rubbery region (0-60 °C) which indicate that the elastic responses of pure SBR towards deformation are strongly influenced by the presence of nanodisperced natural sodium montmorillonite layers especially completely exfoliated silicate layers.

Melt mixed compatibilized polypropylene/clay nanocomposites. II. Dispersion vs. thermal properties, optical transmittance, and fracture behaviors

2011 ◽  
Vol 45 (25) ◽  
pp. 2613-2631 ◽  
Author(s):  
S.-M. Lai ◽  
W.-C. Chen ◽  
X. S. Zhu
Keyword(s):  
Maleic Anhydride ◽  
Clay Content ◽  
Interlayer Spacing ◽  
Optical Transmittance ◽  
Clay Nanocomposites ◽  
Melt Mixing ◽  
Polyolefin Elastomer ◽  
Fracture Behaviors ◽  
Different Types ◽  
Deformation Behaviors

Compatibilized polypropylene (PP)/clay nanocomposites using two different types of maleated compatibilizers, polyolefin elastomer-grafted maleic anhydride (POE- g-MA) and PP-grafted maleic anhydride (PP- g-MA), to improve the dispersion of various amounts of commercial organoclay (Closite 20 A) were prepared via a melt-mixing technique. The optical transmittance for the POE- g-MA compatibilized nanocomposites was lower than that of PP- g-MA compatibilized cases, although POE- g-MA greatly increased the interlayer spacing of the clay compared with PP- g-MA. The optical transmittance of POE- g-MA compatibilized cases increased with increasing clay content, as a result from a preferentially POE- g-MA adsorbed onto the surface and edge of clay moiety. PP- g-MA compatibilized system conferred higher tensile strength, Young's modulus, or cutting strength through crystalline yielding effect even at the nanofracture zone of deformation, but lower tear strength than POE- g-MA compatibilized system. The current results suggested that high extent of exfoliation may not guarantee high transparency or strength varied with different deformation behaviors.

Preparation of Exfoliated Polyethylene/Clay Nanocomposites at High Clay Content

2010 ◽  
Vol 150-151 ◽  
pp. 561-564
Author(s):  
Hao Qun Hong ◽  
Hai Yan Zhang ◽  
Hui He ◽  
De Min Jia
Keyword(s):  
Solid Phase ◽  
Clay Content ◽  
Layered Silicates ◽  
Clay Nanocomposites ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
High Polarity

The polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by melt blending the organic MMT with the ternary-monomer graft copolymers of polyethylene (GPE) which were prepared by solid phase grafting maleic anhydride, methyl methacrylate and butyl acrylate onto PE. Fourier transform infrared spectroscopy was used to characterize the structure of GPE. X-ray diffraction patterns and transmission electron microscopy were used to characterize the morphology of GPE/MMT nanocomposites. Results showed that GPE was an outstanding polymeric material to prepare an exfoliated polymer/layered silicates nanocomposites due to the high polarity of GPE and high graft degree. Most layered silicates still maintain the exfoliated and well dispersed state even at 40 phr OMMT content. The exfoliation of layered silicates was attributed to the well intercalation and easy wetting of the grafted oligomers.

Multiscale Finite Element Modelling of Gallery Failure in Epoxy-Clay Nanocomposites

2012 ◽  
Vol 714 ◽  
pp. 25-32
Author(s):  
C. Pisano ◽  
Pierluigi Priolo ◽  
Łukasz Figiel
Keyword(s):  
Finite Element ◽  
Volume Fraction ◽  
Clay Content ◽  
Strength Reduction ◽  
Clay Nanocomposites ◽  
Fe Model ◽  
Cohesive Law ◽  
Random Dispersion ◽  
Multiscale Finite Element ◽  
Cohesive Zone Elements

A multiscale finite element (FE) methodology is applied to study failure behaviour of an intercalated epoxy-clay nanocomposite. A 2D FE model of the nanocomposite is built to capture nanocomposite morphology and gallery failure mechanism. Intercalated morphology is reconstructed using a random dispersion of clay tactoids within the epoxy matrix, while the galleries are modeled using cohesive zone elements. The nanocomposite response is predicted by numerical homogenization technique. The effects of cohesive law parameters (particularly the fracture energy) and clay volume fraction on the macroscopic behavior of the nanocomposite are investigated. The analysis shows that gallery failure is the main cause of strength reduction of the nanocomposite. Moreover, the strength reduction is found to increase with the clay content, which is in a qualitative agreement with available experimental results.

Nanoclay Gel for Poly(lactic Acid)/Clay Nanocomposite

2013 ◽  
Vol 747 ◽  
pp. 63-66
Author(s):  
Wasuthep Luecha ◽  
Rathanawan Magaraphan
Keyword(s):  
Bentonite Clay ◽  
Clay Content ◽  
Extrusion Process ◽  
Poly Lactic Acid ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Exchange Method ◽  
Elongation At Break ◽  
Cationic Exchange ◽  
High Degree

Nanoclay gel was prepared using organoclay swollen and dispersed in agar which is the hydrocolloid. Bentonite clay was used for preparation of organoclay with quaternary ammonium salt by cationic exchange method. The organoclays loadings in nanoclay gel were 10, 20, 30, 40 and 50 wt%. Results on X-ray diffraction (XRD) and scanning electron microscope (SEM) revealed exfoliation structure and well dispersing developed. Moreover, the application of nanoclay gel as reinforcing filler in polylactic acid (PLA) prepared with melt extrusion process at 1, 3, 5, 7 and 10 wt%, respectively. The tensile properties and morphologies were observed. The tensile strength and the elongation at break increased with increasing the clay content up to 3 wt% and then slightly decreased at higher clay content. The modulus increased with increasing clay loading. The high degree of dispersion PLA/clay nanocomposites were observed with SEM micrographs.

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