Reinforcement of nylon 6,6/nylon 6,6 grafted nanodiamond composites by in situ reactive extrusion

Choi, E.H.; Kim, Kiho; Kim, Chang-Keun; Kang, Eung Shick

doi:10.1038/srep37010

Cited by 41 publications

(24 citation statements)

References 36 publications

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“…Meanwhile, g of PVA/cMND nanocomposites increased by 71.6% compared to that of PVA/MND nanocomposites, which can be attributed to a good nanoparticle dispersion and better interfacial properties. Table 3 shows the improvements on Young's modulus (DE), tensile strength (Dr), onset temperature of thermal decomposition (DT onset ), and thermal conductivity (Dk) with the addition of cMNDs compared with some studies reported in the literature [22,30,[34][35][36]. We can find that PVA/cMND nanocomposites in our work achieved more significant improvements in mechanical properties, thermal stability and thermal conductivity compared with others.…”

Section: Mechanical Behaviormentioning

confidence: 65%

Enhanced thermal and mechanical properties by cost-effective carboxylated nanodiamonds in poly (vinyl alcohol)

et al. 2018

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In this study, the high-energy ball-milled nanodiamonds (MNDs) are carefully treated with low-temperature annealing and mixed acids to obtain carboxylated MNDs (cMNDs). This process not only removes impurities but also grafts oxygen containing functional groups onto MNDs surfaces. Then poly (vinyl alcohol) (PVA)/cMND nanocomposites are prepared by a facile aqueous solution casting method. Compared with PVA/MND, an improved dispersion of nanoparticles in the matrix and higher nanoparticles content can be achieved by PVA/ cMND. It is found that glass transition temperature (T g) and loss factor peak temperature (T tand) of PVA/cMND nanocomposites are both shifted to higher values than pure PVA. Thermal decomposition of PVA is obviously suppressed by cMNDs. The onset and maximum decomposition temperatures increases by over 17 C and 24 C, respectively. The thermal conductivity increases by 57.5%. Furthermore, tensile strength and Young's modulus of PVA are improved by 62.3% and 166.7% with the addition of cMNDs.

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Section: Mechanical Behaviormentioning

confidence: 65%

Enhanced thermal and mechanical properties by cost-effective carboxylated nanodiamonds in poly (vinyl alcohol)

et al. 2018

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“…In the case of wet chemistry, strong acids (H 2 SO 4 , HNO 3 , HCl) are generally utilized to graft oxygen based and chlorine functionalities [387][388][389]. These polar functionalities render the NDs dispersible in polymeric matrixes [390][391][392][393][394][395] and are utilized to improve the composite mechanical properties. Amination is another widely utilized functionality to couple NDs with other organic molecules as in [396] where functionalization of NDs led to covalent bonding with the epoxy matrix.…”

Section: Nanodiamondsmentioning

confidence: 99%

The Role of Functionalization in the Applications of Carbon Materials: An Overview

Speranza

2019

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The carbon-based materials (CbMs) refer to a class of substances in which the carbon atoms can assume different hybridization states (sp 1 , sp 2 , sp 3 ) leading to different allotropic structures -. In these substances, the carbon atoms can form robust covalent bonds with other carbon atoms or with a vast class of metallic and non-metallic elements, giving rise to an enormous number of compounds from small molecules to long chains to solids. This is one of the reasons why the carbon chemistry is at the basis of the organic chemistry and the biochemistry from which life on earth was born. In this context, the surface chemistry assumes a substantial role dictating the physical and chemical properties of the carbon-based materials. Different functionalities are obtained by bonding carbon atoms with heteroatoms (mainly oxygen, nitrogen, sulfur) determining a certain reactivity of the compound which otherwise is rather weak. This holds for classic materials such as the diamond, the graphite, the carbon black and the porous carbon but functionalization is widely applied also to the carbon nanostructures which came at play mainly in the last two decades. As a matter of fact, nowadays, in addition to fabrication of nano and porous structures, the functionalization of CbMs is at the basis of a number of applications as catalysis, energy conversion, sensing, biomedicine, adsorption etc. This work is dedicated to the modification of the surface chemistry reviewing the different approaches also considering the different macro and nano allotropic forms of carbon.C 2019, 5, 84 3 of 45 narrow graphite-like interconnected layers. This leads to a closed pore rigid structure that is chemically inert, hard but brittle [48][49][50].Due to the highly resistant, conductive, and inert network, glassy carbons are utilized in a series of rather different applications. They are utilized as electrodes in solid state batteries and in industrial harsh chemical processes where also high temperatures are involved such as crystallization of CaF2, CdS and ZnS. Glassy carbon can be utilized to manufacture high temperature furnace elements. Due to the chemical inertness, glassy carbons are utilized also in fabrication of protheses. Porous carbon and carbon black are much softer. Generally, in industrial applications important is the extension of the surface which is exposed to the external environment. The porous carbon is characterized by a high specific surface area enhancing the interaction with the external medium. Although it possesses a lower conductivity with respect to glassy carbon, the high porosity and the presence of active sites makes it a good material to fabricate electrodes for applications in electrochemistry [51][52][53] and bioelectrodes for sensing and stimulation [54,55].The same holds for the carbon black mainly utilized as additive in rubbers and polymers to improve their mechanical properties, or as a pigment [56] although new potentialities have been recently envisaged [57].Common to all the forms of carbon which are bri...

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“…The electrical conductivity and thermal degradation temperatures of ND/MWCNT/ PA/PAP/PANi nanofiber reinforced composites were also higher. Choi et al 43 used ND reinforcement for PA66 nanocomposite. Surface modification of ND with acid and acyl chloride end groups was used to chemically graft the nanoparticles on PA66 ( Figure 4).…”

Section: Pa/nd Nanocompositesmentioning

confidence: 99%

Nanodiamond reinforcement in polyamide and polyimide matrices: Fundamentals and applications

Kausar

2018

Journal of Plastic Film & Sheeting

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Nanodiamond is an emerging nanocarbon material having several advantageous properties (high surface area, mechanical properties, optical features, wear resistance, low friction coefficient, etc.) as a nano-sized filler for polymer matrices. Polyamides and polyimides are two important thermoplastic polymers which are among important matrices for nanodiamond composites. Polyamides have high thermal stability, mechanical strength, wear resistance, superior tribological properties, and fine processability. Many aliphatic polyamides, such as polyamide 6, polyamide 6,6, polyamide11, polyamide 12, and several aromatic polyamides have been reinforced with nanodiamond to further enhance their engineering properties. Similarly, outstanding mechanical, thermal, optical, and electrical properties of aromatic polyimides have been enhanced by using nanodiamond particles. Surface nanodiamond modification with various functional groups has been achieved to enhance interfacial adhesion with the matrix, which in turn, improved the physical properties. Polyamide/nanodiamond nanocomposites and polyimide/nanodiamond nanocomposites have been prepared using in situ reactive polymerization, melt extrusion, solution processing, and other techniques. The improved electrical, mechanical, thermal, and biomedical properties render them potentially important materials for various technical applications including energy storage, membrane technology, coatings, and biomedical.

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Reinforcement of nylon 6,6/nylon 6,6 grafted nanodiamond composites by in situ reactive extrusion

Cited by 41 publications

References 36 publications

Enhanced thermal and mechanical properties by cost-effective carboxylated nanodiamonds in poly (vinyl alcohol)

Enhanced thermal and mechanical properties by cost-effective carboxylated nanodiamonds in poly (vinyl alcohol)

The Role of Functionalization in the Applications of Carbon Materials: An Overview

Nanodiamond reinforcement in polyamide and polyimide matrices: Fundamentals and applications

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