scholarly journals A Novel Method of Mechanical Oxidation of CNT for Polymer Nanocomposite Application: Evaluation of Mechanical, Dynamic Mechanical, and Rheological Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Priyanka Pandey ◽  
Smita Mohanty ◽  
Sanjay Kumar Nayak

A new approach of oxidation of carbon nanotubes has been used to oxidize the CNTs. A comparative aspect of the mechanical oxidation and acid oxidation process has been established. FTIR analysis and titration method have shown the higher feasibility of the mechanical oxidation method to oxidize the CNTs. Comparatively less damage to the CNTs has been observed in case of mechanically oxidized as compared to acid oxidized CNTs. The mechanical properties of the nanocomposites reinforced with the acid oxidized CNT (ACNT) and mechanically oxidized CNTs (McCNT) were analyzed and relatively higher properties in the nanocomposites reinforced with McCNT were noticed. The less degree of entanglement in the McCNTs was noticed as compared to ACNTs. The dynamic mechanical analysis of the nanocomposites revealed much improved load transfer capability in the McCNT reinforced composites. Further, the rheological properties of the nanocomposites revealed the higher performance of McCNT reinforced composites.

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Deepti Marathe ◽  
Hemant Joshi ◽  
Pratiksha Kambli ◽  
Pramod Joshi

Abstract Wood plastic composites (WPC) were made from polypropylene (PP), impact copolymer (ICP) and wood flour (WF) by varying the WF content from 10 to 40% with PP grafted maleic anhydride as a coupling agent. The effect of varying WF content was studied on rheological, thermal, mechanical properties and dynamic mechanical properties. Experimental small amplitude oscillatory shear (SAOS) data was compared with the Einstein–Batchelor and empirical Krieger–Dougherty relations. Significant dependence of mechanical and rheological properties on WF content was observed. Young’s modulus, flexural modulus and dynamic shear viscosity increased with WF content. Results of dynamic mechanical analysis (DMA) showed increase in storage modulus with WF content. Three millimeter thick compression molded composites sheets were thermoformed using axisymmetric molds with two draw depths. Sag observed visually during thermoforming decreased with increasing WF content. Components made from the composites showed close to uniform thickness distribution as compared to those from ICP.


2017 ◽  
Vol 15 (1_suppl) ◽  
pp. 13-18 ◽  
Author(s):  
Shiuh-Chuan Her ◽  
Kuan-Yu Lin

Background To predict the mechanical properties of multiwalled carbon nanotube (MWCNT)–reinforced polymers, it is necessary to understand the role of the nanotube-polymer interface with regard to load transfer and the formation of the interphase region. The main objective of this study was to explore and attempt to clarify the reinforcement mechanisms of MWCNTs in epoxy matrix. Methods Nanocomposites were fabricated by adding different amounts of MWCNTs to epoxy resin. Tensile test and dynamic mechanical analysis (DMA) were conducted to investigate the effect of MWCNT contents on the mechanical properties and thermal stability of nanocomposites. Results Compared with the neat epoxy, nanocomposite reinforced with 1 wt% of MWCNTs exhibited an increase of 152% and 54% in Young's modulus and tensile strength, respectively. Conclusions Dynamic mechanical analysis demonstrates that both the storage modulus and glass transition temperature tend to increase with the addition of MWCNTs. Scanning electron microscopy (SEM) observations reveal that uniform dispersion and strong interfacial adhesion between the MWCNTs and epoxy are achieved, resulting in the improvement of mechanical properties and thermal stability as compared with neat epoxy.


2020 ◽  
Author(s):  
◽  
Hassan Judah

This study aims to investigate the effect of different crosslinking agent and different crosslinking agent content on the material properties of the clay-polymer nanocomposite. A lot of materials were tried to be mixed to form a fully-reacted clay-polymer nanocomposite for the first time, which is a part of the novelty for this work. The overall properties governed by clay properties and clay/polymer relationship are prime aspects of this study. The Enhancement of significant properties of nanocomposites is a measure of clay platelets dispersion within the polymer matrix. Different approaches were adopted to understand the influence of clay properties on the nanocomposite; (i) by examining and comparing different clays as raw, dry, powder material using spectroscopy and thermogravimetric analysis (ii) mechanical examination of clay/water suspension of different clay types/grads, and different concentrations varying from 0.5 % - 10 % using rheological studies (iii) chemical and mechanical and morphological examination of Clay/Polymer nanocomposite with different clay types/grades, concentration, and polymers. The synthesis of such material addresses issues including heterogeneity, processability, injectability, crosslinking and mechanical stability. The synthesis requires no purification steps no specialist equipment, and basic typical components of crosslinked nanocomposite/hydrogels (water, monomer, clay and initiator). Morphological, pore size and scaffolding general arrangement which shows the effect of different crosslinking agents and crosslinking density were examined by Scanning Electron Microscope (SEM) to acquire information on wide/small pores are, diffusion kinetics in the system if required for further applications. The nature and elemental composition of the clay-polymer nanocomposites were determined by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier Transfer Infrared (FTIR) spectroscopy. The water content in the dry clay-polymer nanocomposite was determined and examined by Thermogravimetric analysis (TGA). Mechanical and rheological properties of the result were examined using a rheometer that operates on different modes (as a Dynamic Mechanical Analysis (DMA) technique) to evaluate the structure, performance, strength, and mechanical modules of these nanocomposites under different rotational and oscillatory loads. This offers the opportunity to relate the differences to the clays and polymers the hydrogels were synthesised from.


2020 ◽  
Vol 40 (8) ◽  
pp. 676-684
Author(s):  
Niping Dai ◽  
Junkun Tang ◽  
Manping Ma ◽  
Xiaotian Liu ◽  
Chuan Li ◽  
...  

AbstractStar-shaped arylacetylene resins, tris(3-ethynyl-phenylethynyl)methylsilane, tris(3-ethynyl-phenylethynyl) phenylsilane, and tris (3-ethynyl-phenylethynyl) silane (TEPHS), were synthesized through Grignard reaction between 1,3-diethynylbenzene and three types of trichlorinated silanes. The chemical structures and properties of the resins were characterized by means of nuclear magnetic resonance, fourier-transform infrared spectroscopy, Haake torque rheomoter, differential scanning calorimetry, dynamic mechanical analysis, mechanical test, and thermogravimetric analysis. The results show that the melt viscosity at 120 °C is lower than 150 mPa⋅s, and the processing windows are as wide as 60 °C for the resins. The resins cure at the temperature as low as 150 °C. The good processabilities make the resins to be suitable for resin transfer molding. The cured resins exhibit high flexural modulus and excellent heat-resistance. The flexural modulus of the cured TEPHS at room temperature arrives at as high as 10.9 GPa. Its temperature of 5% weight loss (Td5) is up to 697 °C in nitrogen. The resins show the potential for application in fiber-reinforced composites as high-performance resin in the field of aviation and aerospace.


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