Preparation and characterization of nanocomposites of poly-p-phenylene benzobisthiazole with graphene nanosheets

Choudhury, Arup

doi:10.1039/c3ra46908e

Cited by 22 publications

(13 citation statements)

References 66 publications

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“…It could be noted that the experimental values are higher than the moduli predicted by the fitting models, especially al low concentrations. Indeed, at concentrations up to 0.22v/v % (1 wt %) the Halpin‐Tsai underestimates the effective modulus of elasticity of nanocomposites, which suggest a good nanoparticle dispersion and effective stress transfer across the strong ZnO‐PLLA interface . However, the modulus is over predicted at high ZnO concentrations as a consequence of the non‐homogeneous aggregated nanoparticle dispersion within polymeric matrix (see FE‐SEM images).…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, at concentrations up to 0.22v/v % (1 wt %) the Halpin-Tsai underestimates the effective modulus of elasticity of nanocomposites, which suggest a good nanoparticle dispersion and effective stress transfer across the strong ZnO-PLLA interface. 38 However, the modulus is over predicted at high ZnO concentrations as a consequence of the non-homogeneous aggregated nanoparticle dispersion within polymeric matrix (see FE-SEM images). This restriction of segmental mobility of polymeric chains upon uniaxial stress leads to an increase tensile modulus at expenses of elongation at break, as shown in Figure 4.…”

Section: Mechanical Performancementioning

confidence: 99%

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Physical aging and mechanical performance of poly(l‐lactide)/ZnO nanocomposites

Lizundia

Pérez‐Álvarez

Sáenz-Pérez

et al. 2016

J of Applied Polymer Sci

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In this work nanocomposites based on poly (l‐lactide) (PLLA) and zinc oxide (ZnO) nanoparticles with a concentration up to 5 wt % have been prepared by solvent‐precipitation followed by compression moulding at 200 °C. Structural evolution of nanocomposites as a function of time and nanoparticle concentration has been monitored by differential scanning calorimetry (DSC). Results reveal a marked reduction of the enthalpy relaxation rate βH from 3.273 J/g for neat polymer to 0.912 J/g for its 0.25 wt % reinforced counterpart, revealing slower aging dynamics induced by zinc oxide. It is shown by field emission scanning electron microscopy (FE‐SEM) that concentrations larger than 1 wt % yield nanoparticle agglomeration. These large aggregates decrease the amount of nanoparticle surfaces exposed to PLLA chains, notably reducing the efficiency of ZnO nanoparticles to delay the physical aging of its hosting matrix. Mechanical tests show an increased stiffness upon ZnO loading as denoted by the increase in modulus from 2310 MPa to 2780 MPa for the 1 wt % nanocomposite. Obtained findings through this work lead the way for the development of nanocomposites based on renewable polymers and natural fillers to be used in packaging applications, where the use of nonbiodegradable materials for short‐term applications is extended. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43619.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Performancementioning

confidence: 99%

Physical aging and mechanical performance of poly(l‐lactide)/ZnO nanocomposites

Lizundia

Pérez‐Álvarez

Sáenz-Pérez

et al. 2016

J of Applied Polymer Sci

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“…To further enhance the properties of PBO, graphene has been considered as effective reinforcing or functional filler. In previous studies, graphene/PBO nanocomposites were prepared via amidation or esterification using GO as starting materials [24][25][26][27] . Most recently, novel reduced GO/ polybenzoxazole nanocomposites were prepared via an ATRP method 10 .…”

Section: Introductionmentioning

confidence: 99%

“…To further enhance the properties of PBO, graphene has been considered as an effective reinforcing or functional filler. In previous studies, graphene/PBO nanocomposites were prepared via amidation or esterification using GO as starting materials. − Most recently, novel reduced GO/polybenzoxazole nanocomposites were prepared via an ATRP method . However, challenges still remain, mainly from the difficult initial dispersion of the graphene in PBO media or complicated preparation methods.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Functionalization of Graphene by Surface-Initiated Atom Transfer Radical Polymerization: An Ideal Nanofiller for Poly(p-phenylene benzobisoxazole) Fibers

Shao

Moloney

et al. 2017

Macromolecules

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A direct and non-destructive strategy for growing polymers directly from the surface of graphene is demonstrated. The technique involves the covalent attachment of an initiator via one-step cycloaddition of a diarylcarbene, followed by the polymerization of hydroxypropyl methacrylate using atom transfer radical polymerization (ATRP). The functionalization strategy is shown to significantly increase the solubility of the resulting materials (PHEMA-G), and leave the structure of the graphene largely intact. Importantly PMEHA-G/poly(p-phenylene benzobisoxazole) (PBO) composite fibers couild be obtained by a one-pot polymerization and dry-jet wet spinning process. The nanocomposite fibers exhibited a tensile strength of 3.22 GPa (51.2% higher than PBO) and Young's modulus of 139.3 GPa (33.7% higher than PBO) at very low PMEHA-G loading (1.0 wt%). This represents an excellent reinforcing efficiency, better than other reports of the graphene/PBO fibers system, and indicates that this material is suitable for applications in composite science,

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“…1,2 It has been reported that graphene possesses excellent physical properties such as high electronic conductivity, [3][4][5] thermal conductivity, [6][7][8] and mechanical properties. [9][10][11] Recently, graphene has been developed for use in a range of applications, including electronic devices, 12 thermal solutions, 13 chemical catalysts, 14 biosensors, 15 and hybrid composites. 16,17 Generally, graphene is incompatible with organic polymers due to its inherent tendency to agglomerate in polymer matrices and organic media.…”

Section: Introductionmentioning

confidence: 99%