Pelletizing ultra-high molecular weight polyethylene (UHMWPE) powders with a novel tapered die and addition of high density polyethylene (HDPE): Processing, morphology, and properties

Yang, Huaguang; Yilmaz, Galip; Jiang, Jing; Xie, Jun; Langstraat, Thomas; Chu, Raymond; Es, M. van; Garg, Priya; Turng, Lih‐Sheng

doi:10.1016/j.polymer.2022.125171

Cited by 9 publications

(9 citation statements)

References 29 publications

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“…Schematic diagram of the extrusion system is shown in our previous work 24 . The tapered die is composed of a buffer zone and a compression zone.…”

Section: Methodsmentioning

confidence: 99%

“…In order to produce a continuous neat UH extrudate without melt fracture or breakage, the back pressure was kept in the range of 4–8 (MPa). For Neat UH, 5% HD, and 10% HD blend samples, an air gun was used to cool the tapered die to increase the back pressure and ensure that the back pressure was in the desirable range 24 …”

Section: Methodsmentioning

confidence: 99%

“…Schematic diagram of the extrusion system is shown in our previous work. 24 The tapered die is composed of a buffer zone and a compression zone. It has a die length of 35 mm, an exit diameter of 4.5 mm, and a tapered angle of 2 .…”

Section: Sample Preparationmentioning

confidence: 99%

“…For Neat UH, 5% HD, and 10% HD blend samples, an air gun was used to cool the tapered die to increase the back pressure and ensure that the back pressure was in the desirable range. 24 Various blend ratios of extruded pellets were subsequently used for compression molding and injection 3.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The main objectives of this study are to (i) develop an effective extrusion and pelletization process for neat UHMWPE and UHMWPE‐based blends, 24 and (ii) characterize the thermal, rheological, mechanical, and morphological properties of as‐blended and molded samples. In the followings, influence of blends composition and type of processing methods on the various properties of neat UHMWPE and UHMWPE‐based blends are presented.…”

Section: Introductionmentioning

confidence: 99%

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Thermal, rheological, and mechanical characterization of compression and injection molded ultra‐high molecular weight polyethylene, high density polyethylene, and their blends

Yang

Yilmaz

Jiang

et al. 2022

J of Applied Polymer Sci

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Tensile and impact test samples of ultra‐high molecular weight polyethylene (UHMWPE), high‐density polyethylene (HDPE), and their blends at various UHMWPE/HDPE weight ratios were prepared via compression molding and injection molding for thermal, rheological, and mechanical characterization. A twin‐screw extruder with either a tapered die with air‐cooling or a regular die was used to compound and extrude the materials prior to pelletization and molding. To the best of our knowledge, there has been no publication on pelletizing neat UHMWPE using a regular extruder. The differential scanning calorimetry analysis suggested the occurrence of re‐crystallization and co‐crystallization for all the blends. The rheology test confirmed that all the blends exhibited a solid‐like behavior and the degree of compatibility increased with increasing HDPE content in the blends. A strong synergistic effect was observed the blends possessed a higher tensile and impact strength than their neat UHMWPE and HDPE counterparts. The compression molded (95/5) UHMWPE/HDPE samples extruded using the tapered die yielded the highest tensile strength (50.1 MPa), which was about 40% higher than that of the neat UHMWPE samples. The best composition of these blends for compression and injection molded parts is 10% HD and 50% HD, respectively.

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“…Schematic diagram of the extrusion system is shown in our previous work 24 . The tapered die is composed of a buffer zone and a compression zone.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%