Extrusion Foaming of Lightweight Polystyrene Composite Foams with Controllable Cellular Structure for Sound Absorption Application

Fei, Yanpei; Fang, Wei; Zhong, Ming; Jin, Jiangming; Fan, Ping; Yang, Jintao; Fei, Zhengdong; Xu, Lixin; Chen, Feng

doi:10.3390/polym11010106

Cited by 39 publications

(24 citation statements)

References 34 publications

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“…The presence of CNTs affects the mechanical properties of PAN fibers by changing the structure parameters such as orientation, crystallinity and crystallite size. Fei et al [9] observed the improvement in mechanical compressive strength of polystyrene composite foams by addition of MWCNTs, which was gradually improved by increasing the MWCNT wt% up to 1%. Comparison of mechanical strength of PAN and PAN/CNT fibers spun at different shear rates showed that even having the higher porosity (Table 2), the strength of freely spun PAN/CNT fiber improved up to 20% compared of corresponding PAN fibers.…”

Section: Resultsmentioning

confidence: 99%

“…Carbon nanotubes (CNTs) have numerous applications due to their extraordinary properties, among which production of composite fibers based on polymer/CNT with ability to improve physical, mechanical, thermal, electrical and sound absorption properties can be noted [1,2,3,4,5,6,7,8,9]. Production of polyacrylonitrile (PAN)/CNT composite fibers with potential to be used as carbon fiber precursor and to improve mechanical properties of carbon fibers has attracted attention in recent years [6,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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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“…Foam materials are widely used in automotive, helmet, aerospace, and transportation packaging fields because of their light weight, flexible design, good cushioning and shock absorption properties, etc. [8,9,10,11,12]. To reasonably design a buffer structure and avoid resource waste and economic loss, it is necessary to accurately grasp the constitutive relationship of a buffer material or structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Constitutive Model of W/PMMA Composite Microcellular Foams

et al. 2019

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Investigating the constitutive relationship of a material can provide better understanding of the mechanical properties of a material and has an irreplaceable effect on optimizing the performance of a material. This paper investigated a constitutive model for tungsten/polymethyl-methacrylate (W/PMMA) composite microcellular foams prepared by using melt mixing and supercritical carbon dioxide foaming. The stress-strain relationships of these foams with different W contents were measured under static compression. The elastic modulus and compressive strength values of the foams were remarkably greater than those of the pure PMMA foams: at a W content of 20 wt %, these values were increased by 269.1% and 123.9%, respectively. Based on the Maxwell constitutive model, the relevant coefficients were fitted according to the experimental data of different relative densities and W contents in quasi-static compression. According to the numerical relationships between the relevant coefficients and the relative densities and W contents, the quasi-static mechanical constitutive model of W/PMMA composite microcellular foams with W contents of 0~60 wt % and relative densities of 0.15~0.55 were predicted. This study provided basic data for the optimal design of the W/PMMA composite microcellular foams and proposed a method for investigating the mechanical properties of composite microcellular foam materials.

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“…Fei et al studied the supercritical foaming of PS using lignin, multiwalled carbon nanotubes (MWCNT) and micro-graphite (mGr) as heterogeneous nucleating agents [13]. They revealed that the cell sizes of the foams reduced with increasing filler loading.…”

Section: Introductionmentioning

confidence: 99%

Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

2019

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Developing an environmentally benign styrene foam is a critical environmental need. Supercritical CO 2 use in foams has proven to be a valuable path. Adding fillers to increase bubble nucleation has been pursued concurrently. A prominent filler used is high surface area fillers, such as smectic clays. However, all studies to date show a limit of 152% in compressive moduli and 260% in the compressive stress. The values, even with such gains, limit structural application. A seminal work in 1987 by Suh and Cotton proved that carbonyl linkages in calcium carbonates and CO 2 interact and impact nucleation efficiency and performance in supercritical CO 2 foams. In this paper, a high surface area clay (layer double hydroxides) which begins in an exfoliated state, then functionalized with a long chain alkyl carboxylate (stearic acid) is synthesized. The result is a remarkable multi-fold improvement to the compressive properties in comparison to polystyrene (PS); a 268% and 512% increase in compressive modulus and strength, respectively. Using a pre-delaminated approach, the higher surface area was achieved in the clays. The presence of the stearate improved the interactions between the clay galleries and PS through hydrophobic-hydrophobic interactions. The glass transition temperature of the nanocomposites was observed to shift to higher values after foaming. The results point to a new path to increase performance using a pre-delaminated clay with functional groups for environmentally benign foams.

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Extrusion Foaming of Lightweight Polystyrene Composite Foams with Controllable Cellular Structure for Sound Absorption Application

Cited by 39 publications

References 34 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

Investigation of the Constitutive Model of W/PMMA Composite Microcellular Foams

Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

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