Multiphysics characterization of multi-walled carbon nanotube thermoplastic polyurethane polymer nanocomposites during compression

Trangkanukulkij

2018

Sci Rep

Here, we report guided orientation of silver nanowires (AgNWs) in extruded patterns with photo-curable 3D printing technology. A printable conductive composite material composed of polymer matrix and silver nanowires shows significantly varied electrical properties depending on the cross-sectional shape of printing nozzles: flat or circular. The composite is designed to have highly conductive AgNWs and a dielectric polymer matrix like photo-curable methacrylate resin. The dielectric permittivity of photo-curable composite resin with 1.6 vol. % of AgNWs printed through a circular nozzle showed 27. However, the same resin showed much lower permittivity with 20 when it is printed with a flat nozzle. The cross-sectional sample morphology shows that AgNWs printed with a circular nozzle are aligned, and AgNWs printed with a flat nozzle are randomly distributed. A computational simulation of paste extrusion with two different nozzle shapes showed clearly different fluidic velocities at the nozzle exit, which contributes to different fiber orientation in printed samples. A radio frequency identification sensor is fabricated with 3D printed composite using a flat nozzle for the demonstration of AgNW based 3D printed conductor.

Section: Introductionmentioning

confidence: 99%

Nozzle Shape Guided Filler Orientation in 3D Printed Photo-curable Nanocomposites

Trangkanukulkij

2018

Sci Rep

The 18th International Conference on Experimental Mechanics

“…An additional level of control can be offered by engineering the interface between the chosen matrix material and the CNTs. This interphase region has been shown to be affected by CNT proximity [3][4][5][6][7][8][9]. Furthermore, packing and confinement effects which arise from even moderate CNT volume fractions (Vf's) give rise to additional nanostructure [10].…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Carbon Nanotube Volume Fraction Effects on Micromechanical Quasi-Static & Dynamic Properties of Poly(Urethane-Urea) Filled Nanocomposites

Gair

Lidston

Cole

et al. 2018

Poly(urethane-urea) (PUU) has been infused into ultrahigh volume fraction carbon nanotube (CNT) forests using a heat-curable polymer formula. Polymer nanocomposites with carbon nanotube volume-fractions of 1%, 5%, 10%, 20%, and 30% were fabricated by overcoming densification and infusion obstacles. These polymer nanocomposites were nanoindented quasistatically and dynamically to discern process-structure-(mechanical) property relations of polymerizing PUU in such densely-packed CNT forests. A 100× increase in indentation modulus has been observed, which is attributed not only to CNT reinforcement of the matrix, but also to molecular interactions in the matrix itself. Quasi-static elastic moduli ranging from 10 MPa-4.5 GPa have been recorded. Storage modulus for all materials is found to track well at loadings of 200 Hz, with little effect observed from increasing CNT volume fraction.

J of Applied Polymer Sci

“…dimensional stability, degradation, thermal aging, and so forth of PUF despite its outstanding properties. 9 The nanocomposite PUFs with the incorporation of carbon based nano-fillers for attributing a large number of benefits have been developed with tailor made properties for specific applications. 9 Polymer foam is a cellular structure that has low density as well as good mechanical properties and the cellular structures are available in nature.…”

mentioning

confidence: 99%

“…9 The nanocomposite PUFs with the incorporation of carbon based nano-fillers for attributing a large number of benefits have been developed with tailor made properties for specific applications. 9 Polymer foam is a cellular structure that has low density as well as good mechanical properties and the cellular structures are available in nature. 10 The term "cellular structures" encompasses a wide range of materials with varying properties and applications.…”

mentioning

confidence: 99%

“…12 It is very important to correlate the physical properties with the complex structure of cellular structure and their density to tune the optimized properties for a specific application. 9,10 Many studies have reported the elastic response of the periodic materials with particular cell shapes. 13 The effect of nanofillers with their interaction with the matrix can help to strengthen the wall of the in the cellular structure.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Interfacial interactions and properties of cellular structured polyurethane nanocomposite based on carbonaceous nano‐fillers

Mandal

Roy

Prasad

et al. 2020

In this article, we have studied the effect of carbonaceous nanofillers viz. fullerenol (0D), carboxylated multi-wall carbon nanotube (MWCNT, 1D), hydroxylated graphene (2D) and combination of carboxylated CNT and hydroxylated graphene as 3D in thermoplastic polyurethane on the tensile properties of the fabricated cellular structures. The concentration of nano-fillers was varied as 0.1, 1, and 5 wt%. Tensile properties of the nanocomposite cellular structures were measured as per ASTM D882 at 20 C (below glass transition temperature, T g) and 40 C (above T g). The results have shown that the tensile strength was found to increase by 200%-300% and the tensile modulus was found to increase by 150%-300% for 2D and 3D nano-fillers while significantly poor results were observed for 0D. However, the test data tensile strength and modulus showed marginal increase at 20 C and marginally low at 40 C for 1D filler. The interfacial adhesion was calculated by using experimental tensile data and the predictive models. The interfacial adhesion parameter (B σ) calculated using Pukanszky equation was found significantly higher value for 2D (B σ20 = 195.8) and 3D (B σ20 = 192.0) fillers while poor adhesion was observed for 0D (B σ20 = −81.6) fillers. The developed cellular structured materials were also evaluated by attenuated total reflection Fourier transform IR spectra, differential scanning calorimetry, X-ray diffraction, scanning electron microscope, and transmission electron microscope. K E Y W O R D S foams, graphene and fullerenes, mechanical properties, microscopy, nanotubes, surfaces and interfaces 1 | INTRODUCTION Polyurethane (PU) is an elastic and flexible polymer and is used in adhesives, coatings, medical devices, sealants, and thermoplastic elastomers. 1 Polymer foams which are made of skeleton of more or less regular closed or open cells are popularly used in the industry. They have high energy shock absorption capacity, acoustic and thermal insulating properties, filtering applications, 2 and so forth. They are also widely used in automobile, aircraft industry, buildings and packaging. 2 The foams of PUs are used as insulating and core materials for cooling, furniture, and freezing systems, shipbuilding, in house building, 3 and so forth. The use of rigid foams is due to their low