The effects of process parameters on the mechanical properties of die drawn polypropylene

Mourad, Abdel‐Hamid; Bekheet, N.; El-Butch, A. M. A.; Abdel-Latif, Lotfi A.; Nafee, D.; Barton, D.C.

doi:10.1016/j.polymertesting.2004.09.006

Cited by 31 publications

(24 citation statements)

References 6 publications

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“…This is possibly attributed to the phase size of the specimens that were injection molded at high temperatures [52]. A study by Zhou et al [53] on examining the effect of melt temperature also supported this trend; talc-reinforced polypropylene injection molded composites revealed a lower yield strength at high melt temperatures (barrel temperature). The tensile strength nevertheless decreased due to the interfacial binding between the metallic/ceramic filler and polymer matrix [3].…”

Section: Resultsmentioning

confidence: 95%

On the Injection Molding Processing Parameters of HDPE-TiO2 Nanocomposites

et al. 2017

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In recent years, the development and use of polymeric nanocomposites in creating advanced materials has expanded exponentially. A substantial amount of research has been done in order to design polymeric nanocomposites in a safe and efficient manner. In the present study, the impact of processing parameters, such as, barrel temperature, and residence time on the mechanical and thermal properties of high density polyethylene (HDPE)-TiO2 nanocomposites were investigated. Additionally, scanning electron microscopy and X-ray diffraction spectroscopy were used to analyze the dispersion, location, and phase morphology of TiO2 on the HDPE matrix. Mechanical tests revealed that tensile strength of the fabricated HDPE-TiO2 nanocomposites ranged between 22.53 and 26.30 MPa, while the Young’s modulus showed a consistent increase as the barrel temperature increased from 150 °C to 300 °C. Moreover, the thermal stability decreased as the barrel temperature increased.

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Section: Resultsmentioning

confidence: 95%

On the Injection Molding Processing Parameters of HDPE-TiO2 Nanocomposites

et al. 2017

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“…The main properties that have ensured its success are especially its lightness and transparency. However, despite its good chemical inertness, like polyethylene all organic substances degrades slowly under the combined influence of heat, solar ultraviolet UV radiation, mechanical stress, and chemical agents 1–6. Sunlight is the primary detrimental factor in the aging of greenhouse.…”

Section: Introductionmentioning

confidence: 99%

“…Dilara and Briassoulis17 showed that the durability of the film material depends on its ability to resist erosion. The effect of some aging parameters (e.g., heat, UV radiation) on the mechanical, thermal, and structural stability and degradation behavior of different grades of PE was investigated by Mourad et al1–6…”

Section: Introductionmentioning

confidence: 99%

Degradation assessment of LDPE multilayer films used as a greenhouse cover: Natural and artificial aging impacts

Dehbi

Mourad

Bouaza

2011

J of Applied Polymer Sci

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This article focuses on the assessment and understanding of the mechanism of natural and artificial aging processes of a triple‐layer film made of low‐density polyethylene (LDPE) used as greenhouse cover. The film material contains color dye and ultraviolet–A (UV–A) and infrared (IR) stabilizers and antioxidant. The combined effect of temperature variations and UV–A radiations, of the natural and artificial aging, on the physical properties (free surface energy and yellow color measurements), mechanical behavior (tensile tests), thermal stability (TGA and DSC analysis), and structural stability (FTIR analysis) was investigated. The natural aging was conducted on a greenhouse, located in northern Algeria, over a period of 7 months. However, the artificial aging was performed at four different agricultural greenhouse simulating conditions of temperature and UV–A radiation (namely, at 40°C, 40°C with UV–A, 50°C, and 50°C with UV–A) for periods of aging up to 5486 h (7.6 months). The results revealed that, the maximum loss of the yellow color additives occurs at 2981 h under the natural aging process and at 2440, 1096, 1340, and 121 h under the four artificial aging conditions, respectively. There was an observed increase in the films free surface energy and a significant degradation in the mechanical properties with aging time. This can be correlated with the film material structural changes. The natural aging of the film in North Africa is almost equivalent to artificial aging at 40°C. The concurrent effect of temperature and UV–A radiations induced polymer chains scission leading to faster degradation in the film material and consequently a reduction in its durability and service lifetime. The results show also that the measured parameters are directly related to the limit of use criterion for evaluating the lifespan of agricultural greenhouse LDPE covers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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“…Solid die drawing, combining the advantages of axial drawing and hydrostatic extrusion, was first reported by Ward whilst attracted much attention and interest of academic researchers . Apart from ensuring a define geometry of products, die drawing is more attractive owing to its high production rates, good controllability of final product structure, and applicability to nearly all the common thermoplastic polymers . Numerous studies have investigated the effect of processing parameters on one‐stage die‐drawn polypropylene (PP) and elaborated the relationship among draw ratio, drawing speed, and temperature with the mechanical properties of die‐drawn PP.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from ensuring a define geometry of products, die drawing is more attractive owing to its high production rates, good controllability of final product structure, and applicability to nearly all the common thermoplastic polymers . Numerous studies have investigated the effect of processing parameters on one‐stage die‐drawn polypropylene (PP) and elaborated the relationship among draw ratio, drawing speed, and temperature with the mechanical properties of die‐drawn PP. Compared with conventional one‐stage die drawing, it has been verified that better regulation of structure and properties, dimensional stability and drawability could be realized through the two‐stage die‐drawing process .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Processing Parameters on the Crystalline, Orientation, and Mechanical Properties of Two‐Stage Die‐Drawn Polypropylene

Yang

Luo

et al. 2019

Polymer Engineering & Sci

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An investigation specifically focusing on the relationship among processing parameters, structure, and mechanical properties of solid two‐stage die‐drawn polypropylene (PP) has been done in this study, which aimed at providing a reliable reference in the choose of appropriate conditions that can be able to meet a specific processing requirement. PP sheets were drawn through a self‐design solid two‐stage die‐drawing apparatus to various drawing ratios (DRs) at different speeds and with different die‐exit thicknesses. The results showed that tensile strength, modulus, and the degree of orientation significantly increased with the nominal DR and could be further improved by increasing the drawing speed. While the crystallinity increased prior and decreased to near a constant value when the drawing speed was over 150 mm/min in the researched scope. Larger the die‐exit thickness was, lower the orientation degree was but higher the crystallinity could be obtained. Compared with crystallinity, orientation degree plays a leading role in the final product properties during a two‐stage solid die‐drawing process. POLYM. ENG. SCI., 59:2347–2355, 2019. © 2019 Society of Plastics Engineers

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The effects of process parameters on the mechanical properties of die drawn polypropylene

Cited by 31 publications

References 6 publications

On the Injection Molding Processing Parameters of HDPE-TiO2 Nanocomposites

On the Injection Molding Processing Parameters of HDPE-TiO2 Nanocomposites

Degradation assessment of LDPE multilayer films used as a greenhouse cover: Natural and artificial aging impacts

The Effect of Processing Parameters on the Crystalline, Orientation, and Mechanical Properties of Two‐Stage Die‐Drawn Polypropylene

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