Study on the Mechanism of Interfacial Friction Heating in Polymer Ultrasonic Plasticization Injection Molding Process

Tao, Peng; Jiang, Bingyan; Zou, Yang

doi:10.3390/polym11091407

Cited by 10 publications

(24 citation statements)

References 21 publications

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“…Compared with the experimental results of trigger pressure, the height of PP, PA66, and PMMA samples decreased by 43.1%, 49.8%, and 47.3%, respectively, the influence of plasticizing pressure can be sequenced as PMMA ≈ PA66 > PP. The possible reason for the above results was that the temperature of the contact area of the pellet increases rapidly under interfacial friction [19,21,22]. The pressure of sonotrode makes the softened polymer fill the gap, the contact state of inter-pellets changes from point contact to face contact meanwhile.…”

Section: Height Of Plasticized Samplementioning

confidence: 95%

“…Michaeli believes that the energy source of ultrasonic plasticization mainly comes from frictional heat and viscoelastic heat, similar to ultrasonic welding [18]. We studied the mechanism of frictional heat generation and viscoelastic heat generation [19][20][21][22] and found that the interfacial frictional heat determines the temperature distribution during the initial stage of ultrasonic plasticization. Interfacial friction heat generation is the main energy source when the polymer pellets are at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…In order to research the mechanism of frictional heat generation during ultrasonic plasticization, we established a simplified physical model [22] referring to ultrasonic welding [23][24][25]. A polymer rod was cut off with an angle of 30 • between the cross-section and the horizontal plane to study the interfacial friction heat generation under ultrasonic vibration.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

et al. 2019

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Interfacial friction heating is one of the leading heat generation mechanisms during the initial stage of ultrasonic plasticization of polymer pellets, which has a significant influence on the subsequent viscoelastic heating according to our previous study. The interfacial friction angle and contact area of polymer pellets are critical boundary conditions for the analysis of interfacial frictional heating of polymer pellets. However, the duration of the interfacial friction heating is extremely short in ultrasonic plasticization, and the polymer pellets are randomly distributed in the cylindrical barrel, resulting in the characterization of the distribution of the interfacial friction angle and contact area to be a challenge. In this work, the interfacial friction angle of the polymer pellets in the partially plasticized samples of polymethyl methacrylate (PMMA), polypropylene (PP), and nylon66 (PA66) were characterized by a super-high magnification lens zoom 3D microscope. The influence of trigger pressure, plasticizing pressure, ultrasonic amplitude, and vibration time on the interfacial friction angle and the contact area of the polymer pellets were studied by a single factor experiment. The results show that the compaction degree of the plasticized samples could be enhanced by increasing the level of the process parameters. With the increasing parameter level, the proportion of interfacial friction angle in the range of 0–10° and 80–90° increased, while the proportion in the range of 30–60° decreased accordingly. The proportion of the contact area of the polymer pellets was increased up to 50% of the interfacial friction area which includes the upper, lower, and side area of the cylindrical plasticized sample.

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Section: Height Of Plasticized Samplementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

et al. 2019

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“…With the wide application of micro/nanodevices, polymer micro/nano manufacturing technology has gradually become one of the important research directions. [1][2][3] Commonly used polymer micro/nano manufacturing technologies include micro-injection molding, 4 nanoimprint lithography, 5 microextrusion molding, 6 etc. Among them, microinjection molding has attracted the attention of many researchers because of its advantages, such as short manufacturing cycle, high efficiency, and mass production potential.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation on the adhesion mechanism at polymer‐mold interface of microinjection molding

Yang

Zhai

Liu

et al. 2020

J of Applied Polymer Sci

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In the demolding process of microinjection molding, the defects of microstructures are often caused by the strong adhesion between polymer and mold. In order to study the adhesion mechanism, the molecular dynamics (MD) method was proposed to simulate the adsorption of cycloolefin copolymer (COC) molecules on mold surfaces. The evolution snapshots of COC molecular chains of three interfacial models were obtained to directly demonstrate the adhesive strength of interfaces. Meanwhile, the work of adhesion, the relative concentration, the potential energy, and the radial distribution function (RDF) were calculated to explain the interaction mechanism of polymer-mold interfaces. The simulation results showed that the COC-Ni interface had the largest work of adhesion and the lowest potential energy, compared with other two interfaces. The van der Waals (VDW) energy, which mainly derived from the interaction between H atoms in COC and the mold material was the only nonbond interaction energy at the COC-Ni and COC-Si interfaces, while the electrostatic energy existed in COC-Al 2 O 3 interface. In order to reduce the adhesion between polymer and mold, fluorine (F) element could be doped into the Ni mold.

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“…In micro-UPM, ultrasonic vibration was applied to the polymer pellets [ 25 , 26 ]. Under the effect of the ultrasonic vibration, friction between the polymer pellets could take place and, thus, the heat can be generated for fabricating the microplastic parts, which has high forming efficiency [ 27 , 28 ]. During micro-UPM, the heating time of polymer material is short, which avoids the degradation of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Micro Ultrasonic Powder Molding Polypropylene Part with Hydrophobic Patterned Surface

Liang

Liu

et al. 2020

Materials

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Constructing regular micro-structures with certain geometric characteristics on the surface of the polymer part can obtain some specific functions. Micro ultrasonic powder molding (micro-UPM) is an efficient processing technique for the fabrication of well-filled micro-structured Polypropylene (PP) parts. The micro-structure array on the surface of the core insert was obtained by low speed wire electrical discharge machining (WEDM-LS). PP polymer surfaces with micro-structured patterns were successfully replicated from the core insert surface after micro-UPM. By studying the detailed topography characterizations of micro-structured PP parts, the effects of processing parameters (ultrasonic energy, welding pressure and holding time) on the micro-structured filling show that when PP polymer was formed under the conditions of 1000 J, 115 kPa and 8 s during micro-UPM, well-filled micro-structured parts can be obtained. Besides, without low surface energy coating modification, the water contact angles (WCAs) of micro-structured PP parts increased from 85.3° to 146.8°, indicating that the wettability of the surface can be changed by replicating the micro-structure on PP parts after micro-UPM.

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Study on the Mechanism of Interfacial Friction Heating in Polymer Ultrasonic Plasticization Injection Molding Process

Cited by 10 publications

References 21 publications

Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

Molecular dynamics simulation on the adhesion mechanism at polymer‐mold interface of microinjection molding

Fabrication of Micro Ultrasonic Powder Molding Polypropylene Part with Hydrophobic Patterned Surface

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