Enhanced vibration damping and dynamic mechanical characteristics of composites with novel pseudo-thermoset matrix system

In this study, waste cotton fibers were environmentally reused. First, they were milled into fine powders with particle sizes of around 30 µm and dyed for use as pigments. Dyeing properties of the cellulose powder were explored by determining the dye uptake, K/S value, and bath ratio. Among the various samples, powders with owf (on weight of fabric) of 0% dye (pristine cellulose powder), and 10% and 50% dyed powders were selected; and these powders were characterized by several methods to compare the properties of dyed and undyed cellulose. The surface morphologies of the powders were observed with a scanning electron microscope (SEM). Combining the SEM images with the Brunauer-Emmet-Teller (BET) data, it was found that the smaller the particle size, the larger is the surface area. In addition, the X-ray photoelectron spectroscopy (XPS) results revealed that with increasing dye concentration, the intensity of the C peak reduced, while those of O and S increased. Moreover, the main components of the dyed and undyed cellulose powders were found to be almost the same from the Fourier-transform infrared spectroscopy (FTIR) results. Finally, the dynamic mechanical analysis (DMA) data revealed that the loss modulus was significantly larger than the storage modulus, demonstrating that the material mainly undergoes viscous deformation.

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“…Figure 10b presents the relationship between tan δ and temperature. tan δ can be determined using the following Equation [29],…”

Section: Dma Measurementsmentioning

confidence: 99%

Dyeing and Characterization of Cellulose Powder Developed from Waste Cotton

et al. 2019

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“…13, No.12 (2019) 1071-1087 Available online at www.expresspolymlett.com https://doi.org /10.3144/expresspolymlett.2019.93 be processed in the molten state, and the high viscosity of the polymer melt may cause a de-alignment of reinforcing fibers and an inadequate penetration in the fiber tow, which could in turn lead to the production of laminates showing unacceptably low quality and properties [4]. These problems could be alleviated by using reactive in-situ polymerizing thermoplastic matrices, which exhibit low viscosity and can be processed with techniques typical of thermosetting resins [5,6]. However, these formulations are nowadays available only for few acrylic polymers and a limited range of applications.…”

Section: Introductionmentioning

confidence: 99%

Melt-spun polypropylene filaments containing paraffin microcapsules for multifunctional hybrid yarns and smart thermoregulating thermoplastic composites

Fredi¹,

Bruenig²,

Vogel³

et al. 2019

Express Polym. Lett.

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The present work focuses on the development of polypropylene (PP) filaments containing paraffin microcapsules (MC), aimed at being incorporated in hybrid yarns to produce multifunctional thermoplastic laminates for thermal energy storage (TES). Benchmark experiments carried out on a small-scale melt compounder and piston-type melt spinning device resulted in the successful production of single filaments containing up to 30 wt% of MC, with diameters of 70-140 µm depending on the collection speed and a surface roughness that increases with the MC content. An increase in the MC fraction also determines a rise in the complex viscosity, but this effect is less evident at higher shear rates and likely almost negligible at the deformation rates typical of the spinning process. Although the MC have a considerable thermal stability, the compounded mixtures reported a sensible mass loss in isothermal thermogravimetric analysis (TGA) tests, which is linked to a not negligible MC damage during the compounding. Nevertheless, differential scanning calorimetry (DSC) on the spun filaments evidenced an increase in the phase change enthalpy with the MC content up to approx. 48 J/g, which is remarkably higher than that of similar systems reported in the literature. The elastic modulus and the properties at break decrease with an increase in the MC content, but the fiber strength is acceptable to produce a hybrid yarn and a thermoplastic laminate up to a MC fraction of 20 wt%.

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“…There are several manufacturing techniques available for making reinforcement preforms for composite laminates and these include (1) Braiding [80,81], (2) Stitching [82][83][84][85][86][87][88], (3) 3D Z-Pinning [89][90][91], and (4) 3D weaving [92]. The schematic of different types of 3D sandwich structure is depicted in Figure 5.…”

Section: D Sandwich Structuresmentioning

confidence: 99%

Multiscale Polymer Composites: A Review of the Interlaminar Fracture Toughness Improvement

Dikshit

Bhudolia

Joshi

2017

Fibers

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Abstract:Composite materials are prone to delamination as they are weaker in the thickness direction. Carbon nanotubes (CNTs) are introduced as a multiscale reinforcement into the fiber reinforced polymer composites to suppress the delamination phenomenon. This review paper presents the detailed progress made by the scientific and research community to-date in improving the Mode I and Mode II interlaminar fracture toughness (ILFT) by various methodologies including the effect of multiscale reinforcement. Methods of measuring the Mode I and Mode II fracture toughness of the composites along with the solutions to improve them are presented. The use of different methodologies and approaches along with their performance in enhancing the fracture toughness of the composites is summarized. The current state of polymer-fiber-nanotube composites and their future perspective are also deliberated.

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Enhanced vibration damping and dynamic mechanical characteristics of composites with novel pseudo-thermoset matrix system

Cited by 75 publications

References 30 publications

Dyeing and Characterization of Cellulose Powder Developed from Waste Cotton

Dyeing and Characterization of Cellulose Powder Developed from Waste Cotton

Melt-spun polypropylene filaments containing paraffin microcapsules for multifunctional hybrid yarns and smart thermoregulating thermoplastic composites

Multiscale Polymer Composites: A Review of the Interlaminar Fracture Toughness Improvement

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