Dispersion Of Multi-walled Carbon Nanotubes Research Articles

Enhanced Functional Properties of Low-Density Polyethylene Nanocomposites Containing Hybrid Fillers of Multi-Walled Carbon Nanotubes and Nano Carbon Black.

In this work, hybrid filler systems consisting of multi-walled carbon nanotubes (MWCNTs) and nano carbon black (nCB) were incorporated by melt mixing in low-density polyethylene (LDPE). To hybrid systems a mixture of MWCNTs and nCB a mass ratio of 1:1 and 3:1 were used. The purpose was to study if the synergistic effects can be achieved on tensile strength and electrical and thermal conductivity. The dispersion state of carbon nanofillers in the LDPE matrix has been evaluated with scanning electron microscopy. The melting and crystallization behavior of all nanocomposites was not significantly influenced by the nanofillers. It was found that the embedding of both types of carbon nanofillers into the LDPE matrix caused an increase in the value of Young’s modulus. The results of electrical and thermal conductivity were compared to LDPE nanocomposites containing only nCB or only MWCNTs presented in earlier work LDPE/MWCNTs. It was no synergistic effects of nCB in multi-walled CNTs and nCB hybrid nanocomposites regarding mechanical properties, electrical and thermal conductivity, and MWCNTs dispersion. Since LDPE/MWCNTs nanocomposites exhibit higher electrical conductivity than LDPE/MWCNTs + nCB or LDPE/nCB nanocomposites at the same nanofiller loading (wt.%), it confirms our earlier study that MWCNTs are a more efficient conductive nanofiller. The presence of MWCNTs and their concentration in hybrid nanocomposites was mainly responsible for the improvement of their thermal conductivity.

Amphiphilic biodegradable co-networks of Poly(butylene succinate)-Poly(ethylene glycol) chains for nano-gelation via Click chemistry and its potential dispersant for multi-walled carbon nanotubes

Amphiphilic nanogel (APNG) is a class of material miscible with water and oil which is practical for active molecules incorporation, water-oil dispersion, etc. In general, preparation of APNGs requires multi-steps involving the copolymer with different hydrophilic units and the micelles formation to confine the nano-level for the crosslink. The present work proposes a simple way to prepare APNGs by applying the co-networks of biodegradable hydrophilic and hydrophobic chains. The co-networks between alkyno-poly(acrylic acid) (alkyno-PAA) and diazido-poly(ethylene glycol) (N3-PEG-N3) as well as diazido-poly(butylene succinate) (N3-PBS-N3) via copper-catalyzed azide-alkyne cycloaddition (CuAAC) Click lead to APNG. The variation of hydrophilic N3-PEG-N3 and hydrophobic N3-PBS-N3 controls the amphiphilicity as evidenced from the swelling performances in various solvents with different polarity. The APNG obtained favors multi-walled carbon nanotubes (MWCNTs) to be dispersed in water for weeks without precipitation suggesting a potential dispersant of MWCNTs in hydrophilic media, especially aqueous solution.

Reinforcing MWCNTs to enhance viscoelastic properties of polyurethane nanocomposites by using nano DMA techniques

Multi-walled carbon nanotubes (MWCNTs)-reinforced polyurethane (PU) composites were fabricated by using solution mixing technique followed by compression molding. Nano dynamic mechanical analysis was carried out to investigate the viscoelastic properties of PU/MWCNTs composites within a frequency range of 5–250 Hz. At higher frequencies (250 Hz), the storage modulus of PU/MWCNTs composites with 10 wt% loading of MWCNTs was enhanced by 148% in equivalence to pristine PU. An improvement of 13.3% in storage modulus was observed at a loading frequency of 250 Hz in comparison to that of a loading frequency of 75 Hz, which indicates that the effect of MWCNTs on storage modulus was more pronounced at higher frequencies. At 75 Hz, a minor composition of MWCNTs (3 wt%) was sufficient to reduce the value of tan δ from 0.20 to 0.15, indicating that the material becomes more elastic after reinforcing MWCNTs. This significant improvement in the mechanical behavior of composite material has been attributed to the uniform dispersion of MWCNTs, and their adhesion with PU molecules. Reported enhancement in the elastic behavior of PU composite will boost the applicability of PU-based composite material for the fabrication of high-strength boots, gloves, and jackets required to absorb high vibration frequencies experienced during conditions such as rock drilling.

Multifunctional polylactide nonwovens with 3D network of multiwall carbon nanotubes

Nonwovens of commercially available polylactide (PLA) were produced by electrospinning using laboratory scale equipment. The nonwovens were subsequently coated with an aqueous dispersion of multiwall carbon nanotubes (MWCNT), using the padding technique. MWCNT formed 3D networks on fiber surfaces making the nonwovens electrically conducting, with surface electrical resistivity of 77 Ω/sq – 680 Ω/sq. Modification of the nonwovens with methyltrichlorosilane made them superhydrophobic, what was reflected in the water contact angles of 160 − 175°. In turn, electrochemical deposition of silver particles (Ag°) on the conductive nonwovens imparted antibacterial activity against Staphylococcus aureus (gram-positive) and Escherichia coli (gram-negative).

Characteristics of Current Transfer in PVA Films with Dispersed Multiwall Carbon Nanotubes on Silicon Substrates

Planar nanocomposite structures comprising poly(vinyl alcohol) films with dispersed multiwall carbon nanotubes (MWCNTs) deposited on silicon substrates and provided with aluminum contacts possess rectification properties and have asymmetric nonlinear current–voltage characteristics. Forward-biased nanocomposite structures exhibit a positive temperature coefficient of resistance (TCR) in a temperature interval of 270–350 K, whereas analogous PVA film structures without MWNTs have negative TCR values. Under reverse bias, the structures with MWNTs exhibit TCR with a sign changing from negative to positive. The observed behavior is explained in terms of the tunneling current transfer mechanism.

Investigation on mechanical, wear, and machining characteristics of Al 7075/MWCNTs using the liquid state method

In the present research work, an attempt has been made to fabricate the aluminum metal matrix composite by the stir casting method. Aluminum 7075 alloy is used as a matrix which is reinforced with multi-walled carbon nanotubes (MWCNTs) with varying percentage (0 wt.%, 1.0 wt.%, 2.0wt.%, and 3.0 wt.%). Experiments were carried out to analyze microstructure, mechanical, tribological, and machining characteristics such as microhardness, tensile strength, wear rate, coefficient of friction, material removal rate (MRR), and surface roughness (Ra). Also, the samples were studied under a scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX), and X-ray diffraction analysis (XRD) to investigate the dispersion, chemical composition, and elemental analysis of multi-walled carbon nanotubes in Al 7075. The microscopic study of metal matrix composite samples shows a good dispersion of MWCNT into Al 7075. Results show that the microhardness and tensile strength increase by 6% and 25%. The wear rate and coefficient of friction of composites are decreased by 39% and 48% at a sliding speed of 3 m/s. In addition, the metal removal rate decreases by 40% and the surface roughness enhanced by 38% respectively.

Dispersion of Multi-Walled Carbon Nanotubes Using Polyvinylpyrrolidone for Application in Cement - Based Composites to Enhance Electrical Conductivity

The purpose of this study is to analyse the effective method of dispersion of MWCNTs for the application in cement-based composites. Efficient dispersion of Carbon Nanotubes (CNTs) is one of the most challenging and crucial aspects for the application in cement-based composite. In this study, two different CNTs, pristine and functionalized (p-MWCNTs and f-MWCNTs) were dispersed in de-ionized water using different surfactants, Polyvinylpyrrolidone (PVP k-30 and PVP k-90) & Sodium Dodecyl Sulfate (SDS) and conducted a comparative investigation of the effects. Dispersion using an ultrasonic, treatment with surfactant and integrated method of both were analysed. The influence of CNTs dispersion on the electrical conductivity of the aqueous solution and to cement composites has been studied. Among the surfactant used PVPk-30 provide the best-dispersing effect while PVPk-30+SDS shows an extraordinary enhancement of conductivity of an aqueous solution. Analysis of electrical conductivity of Various % CNTs’ loaded specimen (0,0.001,0.003,0.025 wt.%) with different curing period (3,7,14,21,28 days) showed that the electrical resistivity decreases with CNTs’ loading. Dispersion effect of surfactant on p-MWCNTs and f-MWCNTs has been characterized by Ultraviolet-visible Spectroscopy (UV-Vis) and electrical resistivity measurement is carried for investigation and comparison on enhancement of electrical conductivity.

Effect of Surface Modification on Multi-Walled Carbon Nanotubes and their Reinforced Nylon Composites

In this study, a series of nanocomposites were prepared by melt-blending method using Nylon (Nylon12, PA12) and multi-walled carbon nanotubes (MWCNTs) with various contents such as 0.0 wt.%, 0.5 wt.%, 1.0 wt.%, 3.0 wt.%. In order to improve the dispersion of MWCNTs in composites, the MWCNTs were first acid treated by the HNO3 solution to functionalize the carboxylic groups on the surface. Subsequently, this acid treated MWCNTs were reacted with Polyetheramine (Jeffamine® M2070) and Polyethylenimine under mild conditions, respectively, to obtain the chemically modified MWCNTs (M-M2070 and M-PEI). The amide groups formed on these chemically modified MWCNTs will enhance the compatibility of MWCNTs and Nylon. The effects of different modification methods on the thermal properties, mechanical properties and electrical resistance of these Nylon12/MWCNTs composites were investigated. The results showed that M-M2070 and M-PEI dispersed in Nylon12 homogeneously, and can improve the mechanical and thermal properties of the composite materials effectively. The DMA analysis revealed that the storage moduli of nanocomposites were increased with increasing MWCNTs content. Among all, the nanocomposites containing 3wt% of M-M2070 and M-PEI were shown increased storage moduli 48.2% and 29.8%, respectively. TGA analysis showed that pyrolysis temperature of neat Nylon12 was 412.7 °C, and was increased about 43 °C by addition of M-M2070 and 36.7 °C by addition of M-PEI. Moreover, the surface resistance of neat Nylon12 was 1.68×1014 ohm/sq, and was decreased to 1.33×105 and 4.34×106 ohm/sq by addition of 3wt% M-M2070 and M-PEI, respectively. The resistance values of these nanocomposites have achieved the level of static dissipation, and can prevent the harm of static electricity.

Impact of MWCNT/Al on the combustion behavior of hydroxyl ammonium nitrate (HAN)-based electrically controlled solid propellant

In the controllable combustion field, hydroxyl ammonium nitrate (HAN)-based electrically controlled solid propellants (ECSPs) is of growing interest in green fuels with safety, throttle- ability and at-will on-off capability. However, the current research is confined to the ignition characteristics and ablation process of basic ECSP formulations (75 wt% HAN ionic liquid oxidizer, 5 wt% ammonium nitrate co-oxidizer and 20 wt% polyvinyl alcohol binder), rather than working in functional additives. Herein, multiwall carbon nanotubes (MWCNT) and nano/micro aluminum powders were introduced in ECSPs, facilitating electrical conductivity and energy release. It indicates that the homogeneous dispersed MWCNT in polyvinyl alcohol (PVA) microspheres, preparing by the micro-segmented flow method, results in a 9.8% increase in electrical conductivity of the ECSPs. At 0.5 MPa, ECSPs containing 1%, 3% and 5% 5 µm aluminum powder reinforce the burning rate by 38.0%, 186.3%, 214.7% and mass ablation by 10.7%, 95.2%, 175.6% at 200 V, yet the large heat release by excess aluminum powder shifts the non-self-sustaining combustion of ECSPs to self-sustaining combustion at high pressure (above 0.8 MPa). The mechanism of promoting ECSPs combustion by liberating aluminum-nitric acid (released by HAN ionization) reaction were proposed.

Ionic liquid assisted fabrication of cellulose‐based conductive films for Li‐ion battery

AbstractAn imidazolium‐based ionic liquid, 1‐ethyl‐3‐methylimidazolium diethyl phosphate ([Emim]DEP) was used to dispense graphene nanoplates (GN) and multiwalled carbon nanotubes (MWCNTs) as well as dissolve cellulose for fabricating composite conductive films. The effects of GN, MWCNTs, and cellulose mass ratios on the electrical conductivity and morphology of the films were investigated. The interaction between GN, MWCNTs, and cellulose was analyzed by SEM, X‐ray diffraction (XRD), TGA, and Raman spectroscopy. The results indicate that [Emim]DEP plays a vital and irreplaceable role in GN and MWCNTs dispersion, cellulose dissolution, and porous formation during the regeneration and drying processes. MWCNTs linked flaky GN and a hybrid structure was constructed elaborately to form a better conductive path and improve the conductivity as well as increase the film stability. For the XRD result, the carbonized GN‐MWCNTs‐cellulose films exhibited the graphitic peaks, showing that the films still retained the structure of carbon atoms or molecules. Besides, the maximum conductivity of carbonized GN‐MWCNTs‐cellulose (7:3:2) composite film was up to 9,009 S m−1, due to the small carbon clusters formation and the high degree of graphitization. Further, the carbonized films were applied as anodes in Li‐ion battery and showed good electrochemical performance. The best cyclic stability (i.e., discharge/charge capacity) of 438/429 mA h g−1 and coulomb efficiency of 50.2% were obtained. This novel and sustainable design is a promising approach to obtain cellulose‐based conductive films and anodes for Li‐ion battery applications.

Self-suspended carbon nanotube/polyimide composite film with improved photothermal properties

Self-suspended polyimide (PI) composite films were fabricated. Their diameter and thickness were 2.5 in. and 260 nm, respectively. A high ratio of diameter to thickness of 2.4 × 105 was obtained. The multiwalled carbon nanotubes (MWCNTs) were filled into PI to improve the optical absorption and the photothermal response. By using the N-methyl pyrrolidone solvent for both MWCNTs and poly(amic acid), a homogeneous dispersion of MWCNTs with up to 15% content was obtained. Under the thermal treatment of 300 °C, the composite films were successfully synthesized, which was proved by the measurements of Fourier transform infrared spectrum and x-ray diffraction. Compared with the pure PI film, the optical absorption of the composite films at 532 nm wavelength increased from 10% to 28%. The steady and transient photothermal properties of the composite films were investigated. In the steady state, a temperature rise of 145 °C was obtained under 0.7 W/cm2 illuminating laser power density. The temperature increased by 29 times compared with that of the pure PI film. The corresponding photothermal conversion efficiency improved to 70.8%. In the transient state, the photothermal response time was 7.5 ms, which was only half that of the pure PI film. The excellent photothermal properties of these self-suspended MWCNT/PI composite films highlight their potential applications in micro- and nanoscale devices for photo detection and thermal imaging.

Preparation of stable metal/COOH-MWCNT hybrid nanofluid

Multiwall carbon nanotube (MWCNT) nanofluid have potential to deliver high rate of heat transfer due to the presence of MWCNT which are having high thermal conductivity. Dispersion of MWCNT in polar basefluid is a difficult task because MWCNT are hydrophobic in nature which makes their utilization as a heat transfer fluid challenging. Metal nanoparticles can be attached with MWCNT which can possibly improve their dispersion. These nanofluid are called as hybrid nanofluid. The present study investigates the dispersion stability of hybrid of COOH-functionalized multi-walled carbon nanotubes (COOH-MWCNT) with different metals such as silver (Ag/COOH-MWCNT), copper (Cu/COOH-MWCNT), iron (Fe/COOH-MWCNT) and zinc (Zn/COOH-MWCNT) dispersed in distilled water as a basefluid. Chemical reduction method was used to synthesize hybrid nanoparticles by reducing metal cations in the presence of MWCNT. Dispersion of hybrid metal-MWCNT hybrid has been investigated by spectra analysis method (UV–Vis spectrophotometer) and zeta potential. Scanning electron microscope imaging with EDAX confirmed distribution of metal nanoparticle on the MWCNT surface. Thermal conductivity was measured using KD2 pro thermal analyzer. Results revealed that the sequence of dispersion stability and thermal conductivity of prepared nanofluid was Cu/COOH-MWCNT > Fe/COOH-MWCNT > Ag/COOH-MWCNT > Zn/COOH-MWCNT in distilled water.

Mode II Interfacial Fracture Toughness of Multi-Walled Carbon Nanotubes Reinforced Nanocomposite Film on Aluminum Substrate.

In this investigation, various loadings of multi-walled carbon nanotubes (MWCNTs) ranging from 0.3–1.0 wt % were incorporated into the epoxy to fabricate the nanocomposites. Nanocomposite film with a thickness of 0.2 mm was deposited on an aluminum substrate through a hot-pressing process. Theoretical expression of the model II strain energy release rate for the film/substrate composite structure was derived. End-notched flexure (ENF) tests were performed to characterize the mode II fracture energy of the composite structure. Experimental results indicate that the elastic modulus, ultimate strength, and mode II fracture energy increase as the MWCNT loading in the nanocomposite increases. In the case of nanocomposite film with 1.0 wt % of MWCNTs, the elastic modulus, ultimate strength, and mode II interfacial fracture toughness are increased by 20.6%, 21.1%, and 54.4%, respectively in comparison with neat epoxy. In addition, the dispersion of MWCNTs in the epoxy-based matrix was investigated using scanning electron microscope (SEM). The SEM images depict that MWCNTs are well dispersed leading to the enhancement of the mechanical properties of the nanocomposite.

Covalent Functionalization of Multi-Walled Carbon Nanotubes for Dispersion in Cement Pastes

Abstract Covalent functionalization of multi-walled carbon nanotubes (MWCNTs) were obtained through acidification, γ-Methacryloxypropyl trimethoxy silane (KH-570) treatment, and free radical polymerization using methyl allyl polyethenoxy ether (HPEG). Fourier-transformed infrared spectroscope was employed to determine the composition and structural changes of MWCNTs after modification. The dispersion of MWCNTs modified by HPEG in water at pH∼13 was determined by UV-vis-NIR. In addition, the effects of modified MWCNTs on cement hydration were investigated to describe the dispersibility of MWCNTs in cement pastes indirectly. Results show that oxygen functional groups generated on the surface of MWCNTs after acidification and KH-570 grafted on acidified MWCNTs through ≡Si–O–C≡ before radical polymerization with HPEG. MWCNTs modified by HPEG exhibit better dispersibility than pristine MWCNTs in a simulated cement pastes environment prepared at pH∼13. The additions of functionalized MWCNTs (P3-S-MWCNTs) promote the hydration of cement pastes indicated from isothermal conduction calorimeter measurement and X-ray diffraction analysis. Scanning electron microscopy observation confirmed the good dispersibility of functionalized MWCNTs in cement pastes. The promoting effect on cement hydration of P3-S-MWCNTs may attribute to the well-dispersed MWCNTs. The dispersed MWCNTs can act as the nucleating agent for carbon-sulfur-hydrogen and carbon-hydrogen, thus promoting the hydration of cement.

Electrochemical fingerprint of cytochrome c on a polymer/MWCNT nanocomposite electrode

The electroactivity of cytochrome c on screen-printed graphite electrodes modified with stable dispersions of multi-walled carbon nanotubes in aqueous solution of amphiphilic poly(n-butyl acrylate)100-block-poly(acrylic acid)140 diblock copolymers was estimated. Using a broad potential window, the reduction and oxidation of heme iron at a near-zero potential, the electrooxidation of Tyr and Trp at +0.6 V and the electrooxidation of heme at +0.8 V were detected in a wide concentration range of 1–100 μm with a limit of detection of 1–2 μm. Such a multipoint detection can be used as an electrochemical fingerprint of cytochrome c for its electrochemical recognition and quantification in complex (bio)chemical analytes.

Rheological Properties and Phase Structure of Polypropylene/Polystyrene/Multiwalled Carbon Nanotube Composites

In this work, nanocomposites of polypropylene (PP)/polystyrene (PS)/multi-walled carbon nanotube (MWCNT) were prepared by the sonochemical polymerization of styrene in the presence of PP and MWCNT. This procedure offered a composite (PP-g-PS/MWCNT) having a unique phase structure in which MWCNTs are distributed in both phases of PP and PS, which is contrary to the typical observations in the composites made by the melt blending process (PP/PS/MWCNT) where MWCNTs are preferentially located in PS phase. It is shown that the PP-g-PS/MWCNT samples exhibit a strong solid-like behavior and viscosity upturn at a low-frequency range whose extent increases with MWCNTs content, while such features are not significant in the case of PP/PS/MWCNT. In addition, it is demonstrated that the storage modulus measured from dynamic mechanical analysis and electrical conductivity of PP-g-PS/MWCNT are also superior to those of PP/PS/MWCNT at the same loadings of MWCNTs, which can be attributed to the state of MWCNTs dispersion and their localization behavior in the biphasic systems of PP and PS.

Signal multi-amplified electrochemical biosensor for voltammetric determination of tau-441 protein in biological samples using carbon nanomaterials and gold nanoparticles to hint dementia.

A signal multi-amplified electrochemical biosensor was fabricated for tau-441 protein, a dementia biomarker. It utilizes a carbon nanocomposite film modified gold electrode. The carbon nanocomposite film was composed of multi-walled carbon nanotubes (MWCNTs), reduced graphene oxide (rGO), and chitosan (CS). For the nanocomposite film, rGO improved the dispersibility of MWCNTs, and the effective surface area of MWCNTs was increased. On the other hand, MWCNTs also increased the interlayer spacing of rGO, resulting in a thinner rGO layer. MWCNTs-rGO had a better conductivity than that of MWCNTs and rGO due tothe synergy effect. Biocompatible CS was employed for immobilization of the specific antibody. Tau-441 protein was modified with gold nanoparticles (AuNPs) for signal amplification again. The response of the electrochemical biosensor is linear in the range0.5-80fM (0.5, 1.5, 5, 10, 40, 80fM) with a limit of detection (LOD) of 0.46 fM, using differential pulse voltammetry (DPV) in a potential range of - 100-500mV. The biosensor was successfully applied to the analysis ofserum samples of 14 normal people, 14 mild cognitive impairment (MCI) patients, and 14 dementia patients. Graphical abstract Schematic representation of signal multi-amplified electrochemical biosensor for determination of tau-441 protein in human serum.

Effect of metal-reinforced UV-O3-TETA functionalized MWCNTs on thermomechanical and radiation-resistant properties of PMMA

In this work multiwall carbon nanotubes (MWCNTs) oxidized with UV-O3 are functionalized with triethylenetetramine (TETA) moiety. A new type of radiation-protective nanocomposite films has been fabricated by free radical polymerisation of methyl methacrylate (MMA) in the presence of the metal-supported, chemically functionalized and highly dispersed MWCNTs, while the long-chain amides, grafted on the MWCNTs surface provide anchorage site for deposits of Ag nanoparticles. The nanocomposite films have been characterized to understand the structural and morphological characteristics, mechanical stability, and thermal resistance. The structural and microscopic features show the homogeneous distribution of MWCNTs in the PMMA matrix that increases the thermal stability, thermo-mechanical strength, thermal conductivity and glass transition temperatures of nanocomposite films, even with the addition of 0.25 wt% of modified nano-fillers. The thermal and thermo-mechanical characteristics of nanocomposites before and after irradiation have been compared with that of pure PMMA and the findings indicate that the high-energy radiation can be efficiently dispersed through the Ag/UV-O3-TETA-MWCNTs/PMMA network and has a significant reinforcing impact on nature of PMMA degradation.

Enhanced Tensile Properties of Multi-Walled Carbon Nanotubes Filled Polyamide 6 Composites Based on Interface Modification and Reactive Extrusion.

To induce uniform dispersion and excellent interfacial properties, we adopted a strategy of combining both polyamide 6 (PA6) grafting for multi-walled carbon nanotubes (MWCNTs) and reactive extrusion of PA6 matrix, based on anionic ring-opening polymerization of ε-caprolactam (CL). Compared to –COOH and –NCO treatments of MWCNTs, enhanced MWCNT dispersion and tensile properties of the composites were achieved using the applied strategy, and the tensile strength and modulus of the PA6-grafted MWCNT-filled PA6 composites were 5.3% and 20.5% higher than those of the purified MWCNT-filled PA6 composites, respectively. In addition, they were almost similar to the theoretical ones calculated by the modified Mori–Tanaka method (MTM) assuming a perfect interface, indicating that the tensile properties of MWCNT-filled PA6 composites can be optimized by PA6 grafting and reactive extrusion based on the anionic ring-opening polymerization of CL due to uniform MWCNT dispersion and excellent interfacial property.

Dispersion and Localization Behavior of Modified MWCNTs in Immiscible Polymer Blends of Polystyrene and Polybutadiene and in Corresponding Nanostructured Block Copolymers

The influence of carbon nanotube (CNT) modification on the dispersion and localization behavior of the CNTs in immiscible blends of polystyrene (PS) and polybutadiene (PB), and in the nanostructured morphology of a star-shaped styrene-butadiene based block copolymer (BCP), was studied to form a basis for the development of functional materials with defined electrical property profiles. Unmodified multi-walled CNTs (MWCNTs) were dispersed in PS, PB and PS/PB blends by solution mixing. Additionally, MWCNTs were functionalized with n-octadecylamine and monoamino-terminated polystyrene to increase the compatibility between the homopolymers and the nanofiller. The MWCNT dispersion and the blend morphology formation were studied using transmission light microscopy and scanning electron microscopy. The MWCNT dispersion could be significantly improved by the modification of the MWCNTs. All MWCNT types were found to preferably localize in the PS phase of the PS/PB blend. However, only blends containing unmodified MWCNTs were electrically conductive. Similar effects were found in BCP/MWCNT composites. The BCP was already electrically conductive with a filler content of 0.1 wt % of unmodified MWCNTs. The stress–strain behavior of the BCP was slightly influenced by MWCNT addition and CNT modification. The dispersability of MWCNTs was significantly improved by CNT functionalization, which indicates a strong polymer-filler interaction.