Remarkably Strengthened microinjection molded linear low-density polyethylene (LLDPE) via multi-walled carbon nanotubes derived nanohybrid shish-kebab structure

Shi, Suyu; Wang, Linyan; Pan, Yamin; Liu, Chuntai; Liu, Xianhu; Li, Yingchun; Zhang, Jiaoxia; Zheng, Guoqiang; Guo, Zhanhu

doi:10.1016/j.compositesb.2019.03.007

Cited by 51 publications

(26 citation statements)

References 78 publications

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“…With the increase of g-C 3 N 4 content, the crystallinity of PVA/g-C 3 N 4 nanocomposites first increases until reaching a maximum of 25.9% at 0.50 wt% g-C 3 N 4 content and then dropped to 22.2% at 1.00 wt% g-C 3 N 4 content, still higher than that of pure PVA (20.5%). Such results may be rationalized as follows: the increased crystallinity for the composites with a relatively low content of nanoparticles is often observed, as widely reported in the literature [23,24,25], because the small number of nanoparticles, serving as nucleating agents, could promote polymer crystallization. However, when more g-C 3 N 4 is incorporated, these nanosheets might gather to form aggregates and weaken their promotion effect on the PVA crystallization, leading to a slight decline in crystallinity.…”

Section: Resultsmentioning

confidence: 63%

Structure and Mechanical Performance of Poly(vinyl Alcohol) Nanocomposite by Incorporating Graphitic Carbon Nitride Nanosheets

Wang

et al. 2019

Polymers

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Owing to the high aspect ratio, the two-dimensional (2D) inorganic nanofillers have attracted extensive interest in the field of polymer reinforcement. In this work, graphitic carbon nitride (g-C3N4) nanosheets were obtained via thermal condensation of melamine and were then ultrasonically exfoliated in water, which was confirmed by atomic force microscopy (AFM) and TEM. Poly(vinyl alcohol) (PVA)/g-C3N4 nanocomposites were achieved by solution casting using water as the solvent. The structure and mechanical performance of PVA/g-C3N4 nanocomposites were studied. It was found that the g-C3N4 nanosheets were well dispersed in the PVA matrix. The introduction of g-C3N4 nanosheets increased the glass transition temperature and crystallinity of the nanocomposites, leading to the improved mechanical performance. Compared with the pure PVA, the PVA/g-C3N4 nanocomposite with 0.50 wt% g-C3N4 nanosheets showed ~70.7% enhancement in tensile strength, up from 51.2 MPa to 87.4 MPa.

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Section: Resultsmentioning

confidence: 63%

Structure and Mechanical Performance of Poly(vinyl Alcohol) Nanocomposite by Incorporating Graphitic Carbon Nitride Nanosheets

Wang

et al. 2019

Polymers

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“…At present, Polyethylene (PE), due to its cost effectiveness and versatile characteristics, is broadly employed in a great variety of industrial applications, including automotive, domestic, furniture, packaging, among a few to mention [38,39]. However, due to the increasing interest towards environmental safety, different strategies have been developed and encouraged to enhance the sustainability of PE and PE-based composites.…”

Section: Introductionmentioning

confidence: 99%

Structure–Property Relationships in Polyethylene-Based Composites Filled with Biochar Derived from Waste Coffee Grounds

et al. 2019

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In this work, biochar (BC) derived from spent coffee grounds has been incorporated into high density polyethylene (PE) through melt mixing. The influence of the filler content on the rheological and thermal behavior of the obtained composites was assessed. In particular, a rheological study was performed systematically using different flow fields, including linear and nonlinear dynamic shear flow, revealing that the dynamics of PE macromolecules in the composite materials are slowed down because of the confinement of the polymer chains onto the filler surface and/or within the BC porous structure. Oscillatory amplitude sweep tests indicated that composites show weak strain overshoot behavior in the nonlinear regime: This finding clearly proves the formation of weak structural complexes, which cause a retardation of the macromolecular chains dynamics. Furthermore, the embedded BC particles were able to improve the thermo-oxidative stability of PE-based composites, remarkably increasing the PE decomposition temperatures.

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“…There are several types of composites, and their quality depends on the structural and chemical properties of the raw materials used, as well as the process specifically employed for composite manufacturing [1,2,3,4,5,6,7,8,9,10,11]. Besides, the possibility to use carbon-based nanoparticles in thermoplastic or thermosetting matrices, combined with different processes, allows for achievement of enhanced mechanical, thermal, and electrical properties [6,12,13,14,15]. For instance, linear low-density polyethylene (LLDPE) nanocomposites with different percentages of multi-walled carbon nanotubes (MWCNTs) were prepared by microinjection molding; the resulting composites manifested improved strength and modulus together with enhanced toughness [14].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the possibility to use carbon-based nanoparticles in thermoplastic or thermosetting matrices, combined with different processes, allows for achievement of enhanced mechanical, thermal, and electrical properties [6,12,13,14,15]. For instance, linear low-density polyethylene (LLDPE) nanocomposites with different percentages of multi-walled carbon nanotubes (MWCNTs) were prepared by microinjection molding; the resulting composites manifested improved strength and modulus together with enhanced toughness [14]. Among thermosetting matrices, the use of epoxy resins is increasingly growing.…”

Section: Introductionmentioning

confidence: 99%

Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability

et al. 2019

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Different industrial mixing methods and some of their combinations ((1) ultrasound; (2) mechanical stirring; (3) by roller machine; (4) by gears machine; and (5) ultrasound radiation + high stirring) were investigated for incorporating multi-walled carbon nanotubes (MWCNT) into a resin based on an aeronautical epoxy precursor cured with diaminodiphenylsulfone (DDS). The effect of different parameters, ultrasound intensity, number of cycles, type of blade, and gear speed on the nanofiller dispersion were analyzed. The inclusion of the nanofiller in the resin causes a drastic increase in the viscosity, preventing the homogenization of the resin and a drastic increase in temperature in the zones closest to the ultrasound probe. To face these challenges, the application of high-speed agitation simultaneously with the application of ultrasonic radiation was applied. This allowed, on the one hand, a homogeneous dispersion, and on the other hand, an improvement of the dissipation of heat generated by ultrasonic radiation. The most efficient method was a combination of ultrasound radiation assisted by a high stirring method with the calendar, which was used for the preparation of a carbon fiber reinforced panel (CFRP). The manufactured panel was subjected to dynamic and vibroacoustic tests in order to characterize structural damping and sound transmission loss properties. Under both points of view, the new formulation demonstrated an improved efficiency with reference to a standard CFRP equivalent panel. In fact, for this panel, the estimated damping value was well above the average of the typical values representative of the carbon fiber laminates (generally less than 1%), and also a good vibroacoustic performance was detected as the nanotube based panel exhibited a higher sound transmission loss (STL) at low frequencies, in correspondence with the normal mode participation region. The manufactured panel was also characterized in terms of fire performance using a cone calorimeter and the results were compared to those obtained using a commercially available monocomponent RTM6 (Hexcel composites) epoxy aeronautic resin with the same process and the same fabric and lamination. Compared to the traditional RTM6 resin, the panel with the epoxy nanofilled resin exhibits a significant improvement in fire resistance properties both in terms of a delay in the ignition time and in terms of an increase in the thermal resistance of the material. Compared to the traditional panel, made in the same conditions as the RTM6 resin, the time of ignition of the nanotube-based panel increased by 31 seconds while for the same panel, the heat release rate at peak, the average heat release rate, and the total heat release decreased by 21.4%, 48.5%, and 15%, respectively. The improvement of the fire performance was attributed to the formation of a non-intumescent char due to the simultaneous presence of GPOSS and carbon nanotubes.

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Remarkably Strengthened microinjection molded linear low-density polyethylene (LLDPE) via multi-walled carbon nanotubes derived nanohybrid shish-kebab structure

Cited by 51 publications

References 78 publications

Structure and Mechanical Performance of Poly(vinyl Alcohol) Nanocomposite by Incorporating Graphitic Carbon Nitride Nanosheets

Structure and Mechanical Performance of Poly(vinyl Alcohol) Nanocomposite by Incorporating Graphitic Carbon Nitride Nanosheets

Structure–Property Relationships in Polyethylene-Based Composites Filled with Biochar Derived from Waste Coffee Grounds

Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability

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