Mechanical Properties of Crystalline and Semicrystalline Polymer Systems

Murmu, Uttam Kumar; Adhikari, Jaideep; Naskar, Anway; Dey, Debsundar; Roy, Avinava; Ghosh, Arkajit; Ghosh, Manojit

doi:10.1016/b978-0-12-820352-1.00248-0

Cited by 11 publications

(9 citation statements)

References 71 publications

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“…In fact, a higher parameter measurement of rheology or crystallinity for a rPP material will potentially lead to better densification at a lower porosity a 3D printed object. [38][39][40] The evaluated geometric accuracy, a unique and the most important parameter used to define the quality of a 3D printed object, was practically acceptable for the GF/rPP composite materials recovered from nonwoven waste masks. To achieve higher geometric accuracy performance of a 3D printed object, three important factors or mechanisms may possibly be involved in improvement of this parameter, as follows:…”

Section: Discussionmentioning

confidence: 96%

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Recycling polypropylene from non-woven disposable masks in developing a three-dimensional printing filament

Zhang

Sun

Liu

et al. 2023

Textile Research Journal

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Non-woven disposable masks play a unique role in reducing the COVID-19 pandemic threat in transmission between people, but the huge amount of disposable non-woven masks generated every day are currently posing a serious challenge to our environment on a global-wide scale. In line with this emerging problem, a series of recycling processes were designed and conducted to evaluate the performance of material recovered from those waste masks for potential use in three-dimensional (3D) printing. A composite filament from recycled polypropylene (rPP) and an additive material, glass fiber (GF), was fabricated by melt-blending processing followed by single-screw extrusion. A variety of material properties, including the chemical/mechanical/microstructure property, thermal stability, printability, rheology performance, and geometrical accuracy toward GF/rPP composite filaments, were comprehensively analyzed. Our results demonstrated that two important mechanical properties, the compression strength and the tensile strength, to a 3D printed object by fused deposition modeling (FDM) from the GF/rPP composite were significantly higher than that of a FDM 3D printed object from GF/polypropylene composites. The specific warpage parameter ( Wsp) and the surface roughness ( Sa) for a 3D printed object from the GF/rPP composite at 30 wt% GF additive would have printing accuracy of 0.54% ± 0.0014 and 21.1 ± 0.76 µm, respectively, and no clogging phenomenon was observed in the printer nozzle channel during the printing processing, suggested that this recycling method for a large number of non-woven waste masks was potentially applicable in serving as a FDM 3D printing material.

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Section: Discussionmentioning

confidence: 96%

“…In fact, a higher parameter measurement of rheology or crystallinity for a rPP material will potentially lead to better densification at a lower porosity a 3D printed object. 38–40…”

Section: Discussionmentioning

confidence: 99%

Recycling polypropylene from non-woven disposable masks in developing a three-dimensional printing filament

Zhang

Sun

Liu

et al. 2023

Textile Research Journal

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“…In contrast the crystallinity increases from 25.4% to 31.8%. This increase in crystallinity could be related to the fact that lower molecular weight polymers tend to crystallize more easily and facilitate secondary crystallization [26]. The difference between the sample after 168 h of aging and the unaged sample is in comparison much smaller, with a slightly lower melting temperature of T168h = 163.8 °C and a lower crystallinity of 22.6%.…”

Section: Dscmentioning

confidence: 99%

Aging of Industrial Polypropylene Surfaces in Detergent Solution and Its Consequences for Biofilm Formation

et al. 2023

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The performance of plastic components in water-bearing parts of industrial and household appliances, often in the presence of harsh environments and elevated temperatures, critically relies on the mechanical and thermal polymer stability. In this light, the precise knowledge of aging properties of polymers formulated with dedicated antiaging additive packages as well as various fillers is crucial for long-time device warranty. We investigated and analysed the time-dependent, polymer-liquid interface aging of different industrial performance polypropylene samples in aqueous detergent solution at high temperatures (95 °C). Special emphasis was put on the disadvantageous process of consecutive biofilm formation that often follows surface transformation and degradation. Atomic force microscopy, scanning electron microscopy, and infrared spectroscopy were used to monitor and analyse the surface aging process. Additionally, bacterial adhesion and biofilm formation was characterised by colony forming unit assays. One of the key findings is the observation of crystalline, fibre-like growth of ethylene bis stearamide (EBS) on the surface during the aging process. EBS is a widely used process aid and lubricant enabling the proper demoulding of injection moulding plastic parts. The aging-induced surface-covering EBS layers changed the surface morphology and promoted bacterial adhesion as well as biofilm formation of Pseudomonas aeruginosa.

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“…Crystallinity is an important parameter affecting the mechanical, thermal, optical, and chemical properties of materials [38] . Crystalline materials are regular arrays of repeating unit cells in which a set of atoms (motif or basis) is arranged upon lattice points.…”

Section: X‐ray Techniques For Materials Characterizationmentioning

confidence: 99%

“…Crystallinity is an important parameter affecting the mechanical, thermal, optical, and chemical properties of materials. [38] Crystalline materials are regular arrays of repeating unit cells in which a set of atoms (motif or basis) is arranged upon lattice points. According to the lattice geometry, there are 4 types of unit cells (primitive, body-centred, face-centred, and sidecentred), forming 14 Bravais lattices through 7 crystal classes (cubic, monoclinic, trigonal, triclinic, tetragonal, hexagonal, and orthorhombic).…”

Section: Basic Principles Of X-ray Diffractionmentioning

confidence: 99%

X‐Ray Techniques Dedicated to Materials Characterization in Cultural Heritage

Magdy

2023

ChemistrySelect

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This article discusses the basic principles, methodological features, instrumental characteristics, and practical applications of X‐ray techniques in cultural heritage. X‐ray techniques are a set of well‐defined methods for determining the chemical composition and properties of samples. In the field of cultural heritage, material characterization provides valuable information on archaeological materials for understanding heritage assets and ensuring their sustainability. X‐ray fluorescence (XRF) is a versatile method for qualitative and semi‐quantitative elemental analysis. X‐ray diffraction (XRD) is a characterization method to define the properties of the crystal structure of materials. X‐ray photoelectron spectroscopy (XPS) is a chemical tool for understanding the surface chemistry of materials. X‐ray absorption fine structure (XAFS) is a powerful probe for determining the local atomic environment of individual atomic species. X‐ray imaging methods are used for visualization and examination of the objects under study, including X‐ray radiography (XRR) for the non‐destructive inspection of objects, X‐ray computed tomography (XCT) for revealing the internal structure of materials, and dual‐energy X‐ray absorptiometry (DEXA) for the diagnosis of bone health. X‐ray techniques represent key analytical techniques in archaeometric investigations and provide valuable insights into the cultural significance of artifacts.

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Mechanical Properties of Crystalline and Semicrystalline Polymer Systems

Cited by 11 publications

References 71 publications

Recycling polypropylene from non-woven disposable masks in developing a three-dimensional printing filament

Recycling polypropylene from non-woven disposable masks in developing a three-dimensional printing filament

Aging of Industrial Polypropylene Surfaces in Detergent Solution and Its Consequences for Biofilm Formation

X‐Ray Techniques Dedicated to Materials Characterization in Cultural Heritage

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