Poly(amino acid)/carbon nanotube nanocomposites with enhanced thermal, electrical, and mechanical properties

Fan, Xing; Ren, Haohao; Yan, Yonggang

doi:10.1002/pc.24923

Cited by 11 publications

(11 citation statements)

References 40 publications

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“…Mahfuz et al [32] also observed about 5 °C increase in T g due to addition of CNTs to nylon filaments. This increase in T g might be due to restrictions in mobility of PAN chains, possibly as a result of formation of a strong interface between PAN and CNTs or crystallization of structure in the vicinity of CNTs [33,34].…”

Section: Resultsmentioning

confidence: 99%

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process

et al. 2019

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Wet spinning of polyacrylonitrile/carbon nanotubes (PAN/CNT) composite fibers was studied and the effect of spinning conditions on structure and properties of as-spun fibers influenced by the presence of CNTs investigated. Unlike PAN fibers, shear force had a larger effect on crystalline structure and physical and mechanical properties of PAN/CNT composite fibers compared to the elongational force inside a coagulation bath. Under shear force CNTs induced nucleation of new crystals, whereas under elongational force nucleation of new crystals were hindered but the already formed crystals grew bigger. To our knowledge, this key effect has not been reported elsewhere. At different shear rates, strength, Young’s modulus and strain at break of PAN/CNT as-spun fibers were improved up to 20% compared to PAN fibers. Application of jet stretch had less influence on physical and mechanical properties of PAN/CNT fibers compared to PAN fibers. However, the improvement of interphase between polymer chains and CNTs as a result of chain orientation may have contributed to enhancement of Young’s modulus of jet stretched composite fibers.

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Section: Resultsmentioning

confidence: 99%

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process

et al. 2019

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“…In addition to HA, other fillers with special morphologies and size were greatly reported, including carbon nanotubes, graphene oxide, carbon fiber and glass fiber and so on. [14,[31][32][33][34][35] These fillers all showed great improvement for composites, especially for the mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of particle size of hydroxyapatite on mechanical property and cytocompatibility of hydroxyapatite/poly(amino acid) composites

Lyu

Zhang

et al. 2021

Polymer Composites

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In this work, three different particle sizes of hydroxyapatites (HA) were synthesized, and these three types of HA were combined with poly(amino acid) (PAA) to form composites (PAA/HA) by phase separation technique. XRD, FT-IR, SEM, EDS, and XPS analyses were utilized to characterize the structure and morphology of the synthesized three HA particles and composites. Results revealed that HAs with three different particle sizes (short rod (HA1), long rod in nanoscale (HA2), and long rod in micron level (HA3)) were successfully prepared and there was an interface interaction between PAA and HA in composites. Mechanical tests showed that the difference of HA in size played an important role in mechanical performance of the composites. Furthermore, the long rod nano-HA showed the highest enhancement in flexural yield strength at 81.3% for PAA/HA2 compared with pure PAA. After 28 days of immersion in PBS, PAA, and its composites showed good stability, and the mechanical performance of all composites were remained unchanged. The cell culture results showed all composites were cytocompatible, cells attached on the materials well with excellent morphology. Thus, it could be concluded that particle size influenced mechanical properties of PAA/HA composites, without impacting their cytocompatibility and degradation behavior.

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“…22 The hydroxyproline and aminocaproic acid was blended and copolymerized by in situ melting polycondensation in the interest of improving the mechanical properties. 23 Therefore, methionine was employed into aminocaproic acid-based copolymers for improving the hydrophilicity and then increasing degradation ratio of PAA in this paper.…”

Section: Introductionmentioning

confidence: 99%

Reactive oxygen species‐responsive degradable poly(amino acid)s for biomedical use

Fan

Zhu

Yan

et al. 2021

J of Applied Polymer Sci

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A series of reactive oxygen species-responsive degradable poly(amino acid)s (PAAs) was synthesized via in situ melting polycondensation. The PAAs were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and mechanical property analysis. The degradation and biocompatibility of the PAAs were also studied to evaluate their applicability as biomedical materials. The results show that the PAAs possessed semicrystalline amide structures, and the PAA melting temperature decreased gradually with increasing methionine loading. The incorporation of methionine decreased the thermal stability of the matrix, leading to decreases in both the initial and maximum degradation temperatures. The mechanical properties of the PAAs deteriorated as the content of methionine increased. The content of methionine had an obvious effect on PAA degradation, and the PAAs were responsive to the reactive oxygen-rich environment, suggesting that the incorporation of methionine is effective at improving the degradation of PAAs. The PAAs showed great in vitro and in vivo biocompatibilities. Based on the results, these polymers show promise as high-performance materials for biomedical applications.

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Poly(amino acid)/carbon nanotube nanocomposites with enhanced thermal, electrical, and mechanical properties

Cited by 11 publications

References 40 publications

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process

Effects of particle size of hydroxyapatite on mechanical property and cytocompatibility of hydroxyapatite/poly(amino acid) composites

Reactive oxygen species‐responsive degradable poly(amino acid)s for biomedical use

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