Predictive modeling of creep in polymer/layered silicate nanocomposites

Shokuhfar, Ali; Zare-Shahabadi, Abolfazl; Atai, Ali Asghar; Ebrahimi-Nejad, Salman; Termeh, M

doi:10.1016/j.polymertesting.2011.12.013

Cited by 32 publications

(22 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Where, γ 0 represents instantaneous strain at time t = 0, and “ m ” and “ n ” are the characteristics constants of the material used. Here, both γ 0 and “ m ” are stress‐dependent constants, whereas “ n ” remains independent of stress . The creep data were compared with the Findley model.…”

Section: Characterizationmentioning

confidence: 99%

Thermal, dynamic mechanical, and creep behavior of carbon nanotube reinforced ASA/Na‐ionomer blend

Datta

Guha

Sarkhel

2015

Polymers for Advanced Techs

View full text Add to dashboard Cite

The present manuscript is aimed at the development of the protective layer for metal components for outdoor applications such as telecommunication components. Multiwalled carbon nanotubes at varying weight (from 0.5% to 5.0% by weight) were incorporated into newly developed 50/50 blend of acrylonitrile styrene acrylate (ASA) and ethylene acrylic acid-based Na-ionomer blend. ASA has inherent weather-resistant property whereas Na-ionomer has high affinity to adhere metal components. Nanocomposites were prepared by melt blending technique and were evaluated for thermal properties (thermogravimetric analysis and differential scanning calorimetry), dynamic mechanical analysis, and creep as well as recovery properties. Up to 1% nanotube content, there were predominant polymer/nanotube interactions; further addition resulted in nanotube networks formation that reduced polymer/nanotube interactions. These interactions increased both the thermal stability and storage modulus till 1% nanotube concentration, and after that, decreasing trend is observed. The creep deformation, as well as recovery, shows the opposite trend. In addition, the nanotube/nanotube sliding above 1% nanotube content increased the creep deformation further. The higher temperature played an altogether different role during recovery of the nanocomposite. The different polymer chain parts of the "brush" type ASA/Na-ionomer blend interacted differently with carbon nanotubes; the ionic aggregates peak position of Na-ionomer in differential scanning calorimetry thermogram was influenced by multiwalled carbon nanotubes, but the endotherm peak due to polyethylene crystallites of Na-ionomer was unaffected. Carbon nanotubes also affected the glass transition temperature of polystyrene acrylonitrile matrix of ASA.

show abstract

Section: Characterizationmentioning

confidence: 99%

Thermal, dynamic mechanical, and creep behavior of carbon nanotube reinforced ASA/Na‐ionomer blend

Datta

Guha

Sarkhel

2015

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…So, comparing the two production methods of polymeric nanocomposites, in the case of in situ polymerization method, the polymer chains are tied to the surface by means of strong ionic bonding between the nanolayer and the polymer end, 9 whereas, in the melt processing method, molten resin is mixed with nanoplatelets under shearing load of extrusion, only weak hydrogen bonds and van der Waals forces between polymer chains and organic surface of platelets exist. This explains that the nanocomposites presented in Figure 5 showed a relatively low constrain factor (k c ¼ 6) compared to that predicted in creep model for nylon 6/clay nanocomposites, 11 (k c ¼ 25). The creep tests as mentioned earlier have been conducted for 0.6 and 1.3 vol.% reinforcements because each blend showed very high viscosity toward uniformly distribute the curative package, but the model can be used to investigate results at different temperatures and different filler content.…”

Section: Creep Stiffnessmentioning

confidence: 78%

Analytical prediction of creep behavior in polymeric-based nanocomposites

Almagableh

Mantena

Al‐Ostaz

et al. 2015

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

A micromechanical model using properties of both polymer and filler is proposed to address creep response in case of nanocomposites consisting of graphite nanoparticles embedded in a polymer matrix. Empirical creep models like Burgers and Findley models have been frequently used for creep simulation of polymeric-based nanocomposites. An elastic stiffness model has been established first to simulate stiffness property of nanocomposites with emphasis on filler distribution conditions. Creep stiffness is then predicted from the outstanding stiffness model based on the linear elastic-viscoelastic principle. In the model development, a parameter termed as additional constraint stiffness factor has been defined in the model to account for the constraining effect played by nanoparticles on the polymer chains. Magnitude of constraint factor indicates performance of nanoparticles in preventing polymer chains motion under creep loading of the nanocomposite. Creep predictions of the model with and without effect of the additional constraint stiffness factor are compared with experimental results obtained for vinyl ester reinforced nanocomposites. Predictions of the model disregarding the additional constraint stiffness factor overestimate the experimental results and do not provide good agreement. For each of the studied nanocomposites, the present model was able to provide creep response according to different filler percentage and different temperature along with the same stiffness function and similar constraint factors, in each case.

show abstract

“…N, N-dimethyl hexadecyl amine (as a part of polymeric modifier and cation exchange) was acquired from Fluka Chemical, and used as received. Sodium montmorillonite (Na 1 -MMT) as a nano material was obtained from Southern Clay Products (Texas, USA), under the trade name of Cloisite NaC, which possesses the idealized chemical formula of Na 0.33 (Mg 0.33 Al 11.67 Si 4 O 10 ) (OH) 2 and a cation exchange capacity of 95 meq/100 g. All other reagents were purchased from Merck and purified according to standard methods.…”

Section: Methodsmentioning

confidence: 99%

Polymericaly modified clays to preparation of polystyrene nanocomposite by nitroxide mediated radical polymerization and solution blending methods

2015

View full text Add to dashboard Cite

Polymericaly modified clays that contain an oligomeric poly (styrene-co-chloromethyl styrene) ammonium salt have been prepared and used to preparation of polystyrene (PS) nanocomposites. First, PS and poly(styrene-co-chloromethyl styrene) [P(St-co-CMSt)] were synthesized by nitroxide mediated living free radical polymerization (NMRP) by TEMPO iniferter .Then the copolymer was coupled with N, N-dimethyl hexadecyl amine to prepare polymeric modifier by anion exchange of chlorine group of chloromethyl styrene (CMSt) by quaternary amine. The synthesized polymeric modifier was mixed with nanoparticle of silica to change the property of clay surface from hydrophilic to hydrophobic via cation exchange of Na 1 with alkylammonium ions. For synthesizing of nanocomposites, we used polymericaly modified montmorillonite and PS that was synthesized by NMRP technique. Intercalated nanocomposites and in some cases, exfoliated or mixed intercalated/exfoliated nanocomposites of all of these polymers have been produced by solution blending method. The prepared materials were characterized by X-ray diffraction, Transmission electron microscopy, Fourier-transform infrared, 1 H nuclear magnetic resonance, and gel permeation chromatography techniques. Effect of layered silicates on thermal properties and glass transition temperature of PS was investigated using TGA and DSC techniques. POLYM.

show abstract

Predictive modeling of creep in polymer/layered silicate nanocomposites

Cited by 32 publications

References 36 publications

Thermal, dynamic mechanical, and creep behavior of carbon nanotube reinforced ASA/Na‐ionomer blend

Thermal, dynamic mechanical, and creep behavior of carbon nanotube reinforced ASA/Na‐ionomer blend

Analytical prediction of creep behavior in polymeric-based nanocomposites

Polymericaly modified clays to preparation of polystyrene nanocomposite by nitroxide mediated radical polymerization and solution blending methods

Contact Info

Product

Resources

About