Electron beam modified nylon 6-clay nanocomposites: morphology and water absorption behavior

nano Online ◽  
2016 ◽  
Author(s):  
Subhendu Ray Chowdhury ◽  
Sanju Francis ◽  
Kuppa Sivasankara Sarma
Keyword(s):  
Electron Beam ◽  
Water Absorption ◽  
Nylon 6 ◽  
Clay Nanocomposites

Electron beam modified nylon 6-clay nanocomposites: morphology and water absorption behavior

2014 ◽  
Vol 34 (8) ◽  
pp. 715-726
Author(s):  
Subhendu Ray Chowdhury ◽  
Sanju Francis ◽  
Kuppa Sivasankara Sarma
Keyword(s):  
Electron Beam ◽  
Water Absorption ◽  
Clay Content ◽  
Nylon 6 ◽  
Clay Nanocomposites ◽  
Dispersion Pattern ◽  
Melt Mixing ◽  
Absorption Properties ◽  
Gel Content ◽  
Interface Generation

Abstract A series of nylon 6-clay nanocomposites were prepared by melt mixing, followed by electron beam (EB) crosslinking at various doses. Effects of crosslinking on clay dispersion, gel content, crystallinity and water absorption properties (hygrothermal) were studied. No change of the dispersion pattern of clay in nanocomposites was observed after crosslinking [from X-ray diffraction (XRD) and transmission electron microscopy (TEM)]. Gel content, i.e., degree of crosslinking is seen to keep on increasing with irradiation dose, although clays hinder crosslinking of polymers to some extent. Crystallinity of polymers is reduced after incorporation of clay as well as crosslinks. However, water absorption rate and maximum water content of nanocomposites are found to increase and saturation time to decrease with clay content. However, these changes become opposite after crosslinking of polymers. The water absorption for all samples is noticed to increase with temperature. Thus, EB crosslinking, without affecting the nanocomposite morphology, i.e., properties derived from nano interface generation, decreases the water absorption properties of nanocomposites.

Effect of sodium montmorillonite source on nylon 6/clay nanocomposites

Polymer ◽  
2004 ◽  
Vol 45 (7) ◽  
pp. 2321-2331 ◽  
Author(s):  
T.D. Fornes ◽  
D.L. Hunter ◽  
D.R. Paul
Keyword(s):  
Nylon 6 ◽  
Clay Nanocomposites ◽  
Sodium Montmorillonite

Research on Performance of Polyimide In Situ Modification Anionic Polymerization Nylon 6

2014 ◽  
Vol 1052 ◽  
pp. 242-248
Author(s):  
Hong Kai Zhao ◽  
Hong Li Wang
Keyword(s):  
Bisphenol A ◽  
Water Absorption ◽  
In Situ Polymerization ◽  
Microscopic Analysis ◽  
Nylon 6 ◽  
Grafting Reaction ◽  
Lamellar Crystals ◽  
End Capping ◽  
Short Time

Through the polymerization and grafting reaction of bisphenol A dianhydride and bisphenol A diamine, the polyimide activator (PI activator) of acyl caprolactam end capping is obtained and then the anionic in-situ polymerization modified nylon 6 resin is obtained. Viscosity analysis shows that PI consumption is higher than 0.1 (of monomer mass), the reaction temperature is higher than 160°C, the viscosity rises rapidly in a short time and the rapid polymerization molding can be realized; when PI consumption is higher than 0.15 (of monomer mass), the water absorption of matrix resin will be lower than 1.4%; compared with the nylon resin, its water absorption is significantly lowered and its mechanical property is improved greatly; microscopic analysis shows that PI molecules fail to enter the crystalline phase of the nylon 6 and form lamellar crystals in the nylon matrix, which plays a role of enhancement and obstruction; differential thermal analysis shows that PI reduces the melting enthalpy and melting point temperature of nylon 6 resin, which indicates that PI reduces the crystallization capacity of nylon 6.

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.

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