Effects of process parameters and surface treatments of graphene nanoplatelets on the crystallinity and thermomechanical properties of polyamide 6 composite fibers

Hwang, Sang-Ha; Kim, Byeong‐Joo; Baek, Jong‐Beom; Shin, Hyeon Suk; Bae, Il‐Joon; Lee, Seong-Young; Park, Young‐Bin

doi:10.1016/j.compositesb.2016.06.062

Cited by 46 publications

(28 citation statements)

References 46 publications

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“…Due to the high diffusion rate of [Amim]Cl, the formation of regular structures from the molecular chains of cellulose is difficult, resulting in the decrease in its crystallization ability . In fact, by increasing [Amim]Cl concentration in the coagulation bath, the diffusion coefficients of [Amim]Cl can be significantly reduced, which is helpful to keep the cellulose chains regular through plasticization during the coagulation process …”

Section: Resultsmentioning

confidence: 99%

Influences of diffusion coefficient of 1‐allyl‐3‐methylimidazolium chloride on structure and properties of regenerated cellulose fiber obtained via dry‐jet‐wet spinning

Stankovic

Wang

Shi

2019

J of Applied Polymer Sci

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The diffusion dynamics of the cellulose/1-allyl-3-methylimidazolium chloride ([Amim]Cl) solution during coagulation of regenerated cellulose fiber in a nonsolvent bath was investigated in detail. According to Fick's second law of diffusion, the experimental data were fitted to obtain the diffusion coefficients of [Amim]Cl (D). The cellulose concentration, bath type, and temperature were varied to analyze their influence on the diffusion coefficient of [Amim]Cl. Furthermore, the dependence of the structure and properties of the regenerated fiber obtained via dry-jet-wet spinning on the diffusion coefficients were analyzed. Many defects were formed in the surface and cross sections of the regenerated fibers prepared with high diffusion coefficients. The crystallization and mechanical properties deteriorated with the increase in the diffusion rate of [Amim]Cl. Therefore, the diffusion coefficients of [Amim]Cl should be kept relatively low to enable the preparation of uniform-structured regenerated cellulose fibers.

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Section: Resultsmentioning

confidence: 99%

Influences of diffusion coefficient of 1‐allyl‐3‐methylimidazolium chloride on structure and properties of regenerated cellulose fiber obtained via dry‐jet‐wet spinning

Stankovic

Wang

Shi

2019

J of Applied Polymer Sci

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“…A single step twin-screw co-rotating micro-extrusion process has been used in the present work to obtain new PMMA nanocomposites with GO, GO-NT and GO-IL hybrid nanofillers. Extrusion is a common process for the preparation of polymers and polymers containing nanofillers such and nanoclays, carbon nanotube or graphene, however, the influence of the process parameters on the microstructure and properties of the materials has been scarcely studied [22,[37][38][39][40][41][42][43][44][45][46][47][48]. We have studied nanocomposites processed using two temperature profiles and two specific mechanical energy values.…”

Section: Introductionmentioning

confidence: 99%

PMMA nanocomposites with graphene oxide hybrid nanofillers

Sanes¹,

Ojados²,

Pamies³

et al. 2019

Express Polym. Lett.

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Polymethylmethacrylate (PMMA) and nanocomposites containing 0.5 wt.% graphene oxide (GO), graphene oxide-multiwalled carbon nanotubes (NT) or graphene oxide-ionic liquid 1-octyl-3-methylimidazolium tetrafluoroborate (IL) (PMMA+GO; PMMA+GO-NT; PMMA+GO-IL) were processed by a single step twin-screw micro-extrusion. The effect of two extrusion temperature profiles and two specific mechanical energy (SME) values has been studied. Results of Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis show changes in GO composition and morphology, and better dispersion due to interaction with IL. Dynamic mechanical analysis shows that extrusion conditions affect storage modulus of hybrid nanocomposites. Rheological measurements show that the complex viscosity of the nanocomposites is higher than that of PMMA at low shear rates for materials processed under the lower value of SME. A maximum viscosity increase of 62.6% is found for PMMA+GO-NT. The lowest increase found for PMMA+GO-IL, is attributed to the better dispersion of the hybrid GO-IL nanofiller.

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“…In addition, they can be aligned in polymer composite films by the tensile load at the slit‐die of the extruder during the extrusion process . Moreover, CNMs can act as nucleating sites for the growth of orientated crystalline structures to enhance crystallization kinetics . This phenomenon induces the enhancement of mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional spread‐tow carbon fiber/polypropylene composites reinforced with mechanically aligned multi‐walled carbon nanotubes and exfoliated graphite nanoplatelets

et al. 2018

Self Cite

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We investigated efficient methods to maximize the mechanical properties of carbon fiber/polypropylene (PP) composites by combining unidirectional spread‐tow carbon fibers (USCFs) and mechanically stretched PP films reinforced with aligned carbon nanomaterials (CNMs), such as multi‐walled carbon nanotubes (MWCNTs) and exfoliated graphite nanoplatelets (xGnPs). CNM/PP composite films were fabricated using film extrusion process, which resulted in tension‐induced orientation of CNMs. The influences of CNMs and their orientations in the films, the speed of the drawing rollers (take‐up speed), and the degree of crystallinity on the mechanical properties of nanocomposites were investigated. Multiscale hybrid composites (MHCs) consisting of USCFs and PP films reinforced with MWCNTs and xGnPs were manufactured by hot pressing. As compared with neat USCF/PP composites, USCF/PP composites containing 1 wt% aligned CNMs showed up to 18.3 and 77.3% increases in tensile modulus and strength, respectively, and 68.4 and 36.1% increases in flexural modulus and strength, respectively. In parallel, modeling and simulation of CNM/PP composite films and CNM/USCF/PP composites were performed to predict the tensile properties, taking into account the effects of CNM orientation. The mechanical properties of both nanocomposite films and MHCs were most dominantly affected by the degree of polymer crystallinity and CNM orientation. POLYM. COMPOS., 39:E1251–E1261, 2018. © 2018 Society of Plastics Engineers

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Effects of process parameters and surface treatments of graphene nanoplatelets on the crystallinity and thermomechanical properties of polyamide 6 composite fibers

Cited by 46 publications

References 46 publications

Influences of diffusion coefficient of 1‐allyl‐3‐methylimidazolium chloride on structure and properties of regenerated cellulose fiber obtained via dry‐jet‐wet spinning

Influences of diffusion coefficient of 1‐allyl‐3‐methylimidazolium chloride on structure and properties of regenerated cellulose fiber obtained via dry‐jet‐wet spinning

PMMA nanocomposites with graphene oxide hybrid nanofillers

Unidirectional spread‐tow carbon fiber/polypropylene composites reinforced with mechanically aligned multi‐walled carbon nanotubes and exfoliated graphite nanoplatelets

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