The influence of acid-treated multi-walled carbon nanotubes on the surface morphology and thermal properties of alanine-based poly(amide–imide)/MWCNT nanocomposites system

Mallakpour, Shadpour; Behranvand, Vajiheh

doi:10.1007/s00396-014-3437-z

Cited by 21 publications

(11 citation statements)

References 24 publications

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“…This parameter can be determined from the Yc values, based on TGA results by using the Van Krevelen equation [41]:LOI (%) = 17.5 + 0.4Yc Herein, the LOI values of poly( o MHI-a), poly( o HHI-a), poly( o HTI-a), and poly( o PP-a) at 800 °C were found to 27.9, 28.7, 36.7, and 41.5, respectively. Poly( o MHI-a) has a LOI value that is slightly lower than 28, which falls in the slow burning region (21 < LOI < 28); but poly( o HHI-a), poly( o HTI-a), and poly( o PP-a) all have LOI values in the self-extinguishing region (LOI > 28) [42], suggesting that the polybenzoxazines derived from ortho -imide functional benzoxazines were good candidates for applications such as fire-resistant and electronic encapsulation materials.…”

Section: Resultsmentioning

confidence: 99%

Effects of End-Caps on the Atropisomerization, Polymerization, and the Thermal Properties of ortho-Imide Functional Benzoxazines

et al. 2019

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A new type of atropisomerism has recently been discovered in 1,3-benzoxazines, where the intramolecular repulsion between negatively charged oxygen atoms on the imide and the oxazine ring hinders the rotation about the C–N bond. The imide group offers a high degree of flexibility for functionalization, allowing a variety of functional groups to be attached, and producing different types of end-caps. In this work, the effects of end-caps on the atropisomerism, thermally activated polymerization of ortho-imide functional benzoxazines, and the associated properties of polybenzoxazines have been systematically investigated. Several end-caps, with different electronic characteristics and rigidities, were designed. 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and density functional theory (DFT) calculations were employed to obtain structural information, and differential scanning calorimetry (DSC) and in situ Fourier transform infrared (FT-IR) spectroscopy were also performed to study the thermally activated polymerization process of benzoxazine monomers. We demonstrated that the atropisomerization can be switched on/off by the manipulation of the steric structure of the end-caps, and polymerization behaviors can be well-controlled by the electronic properties of the end-caps. Moreover, a trade-off effect were found between the thermal properties and the rigidity of the end-caps in polybenzoxazines.

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Section: Resultsmentioning

confidence: 99%

Effects of End-Caps on the Atropisomerization, Polymerization, and the Thermal Properties of ortho-Imide Functional Benzoxazines

et al. 2019

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“…The LOI parameter of PBO-oPP-an can be determined from the Y c values based on TGA results by using the Van Krevelen equation, 43 from which the LOI value of PBO-oPP-an at 800 C was found to be 45.5. PBO-oPP-an has a LOI value in the selfextinguishing region (LOI > 28), 44 suggesting that the crosslinked polybenzoxazole derived from the ortho-imidefunctionalized benzoxazine containing a nitrile group is a good candidate for applications such as re resistant and electronic encapsulation materials.…”

Section: Thermal and Heat Release Properties Of Thermosetsmentioning

confidence: 99%

Synthesis and thermally induced structural transformation of phthalimide and nitrile-functionalized benzoxazine: toward smart ortho-benzoxazine chemistry for low flammability thermosets

et al. 2019

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“…For instance, Mallakpour et al tried to treat CNT surface by acid, which made mixing of CNT with polar polymers. They preparaed alanine-based poly (amide-imide) / multi-welled CNT nanocomposites system [16] .…”

Section: Dispersing Cntsmentioning

confidence: 99%

Comparison of the effect of various carbon fillers in the paraffin-based phase change materials------A Review

Guo¹,

Du²,

Zhang³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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Using phase change material (PCM) as an energy storage medium is one of the most efficient ways of storing thermal energy. An important organic PCM is paraffin. There are a lot of advantages of paraffin, but an undesirable property of paraffin wax is its low thermal conductivity. The main methods to enhance the thermal conductivity of PCMs are metal particles, carbon fibers, expanded graphite (EG), and nanoparticles. Thus, this kind of PCM is heat transfer unstable and easy to layering. The addition of metal particles will lead to the increase of total weight of the system and cause uneven distribution of metal particles. So, we summarized and compared the researches with the effects of the addition of carbon fibers, EG and carbon nanoparticles to paraffin-based PCMs. We find that the peak value of the thermal conductivity of the composite PCM only appeared when the mass percentage of the carbon marterial in a appropriate location. Three-dimensional thermally conductive networks is better for the thermal conductivity enhancement. And molecular interaction between CNTs and the wax makes the composite enthalpy becomes higher than pure paraffin.

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The influence of acid-treated multi-walled carbon nanotubes on the surface morphology and thermal properties of alanine-based poly(amide–imide)/MWCNT nanocomposites system

Cited by 21 publications

References 24 publications

Effects of End-Caps on the Atropisomerization, Polymerization, and the Thermal Properties of ortho-Imide Functional Benzoxazines

Effects of End-Caps on the Atropisomerization, Polymerization, and the Thermal Properties of ortho-Imide Functional Benzoxazines

Synthesis and thermally induced structural transformation of phthalimide and nitrile-functionalized benzoxazine: toward smart ortho-benzoxazine chemistry for low flammability thermosets

Comparison of the effect of various carbon fillers in the paraffin-based phase change materials------A Review

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