Mechanical and physical characterization of polyoxymethylene processed by high‐velocity compaction

Jauffrès, David; Lame, Olivier; Vigier, G.; Dore, Florence; Chervin, C.

doi:10.1002/app.26231

Cited by 23 publications

(52 citation statements)

References 17 publications

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“…Jauff rès and coworkers [112] applied this technique to process nascent, highly crystalline POM powder. Th e resulting material has a remarkably high stiff ness due to particularly high crystallinity, but the fracture surface observation shows interparticle failures (Figure 4.11).…”

Section: Sinteringmentioning

confidence: 99%

Polyoxymethylene Processing

Pielichowska¹

2014

Polyoxymethylene Handbook

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In this chapter major issues of polyoxymethylene (POM) and its nanocomposites processing are presented. Diff erent processing methods-injection molding, extrusion, blow molding, melt blowing, compression molding, rolling, sintering and spinning-as well as fabrication of highly oriented products, waste recycling, machining and assembling of moldings and semi-fi nished parts are described in regard to POM, which is an important engineering polymer used as structural material in all industrial sectors. However, processing of POM requires special attention since this polymer undergoes facile decomposition with evolution of formaldehyde. Some of the processing methods are for POM at infancy stage, such as electrospinning, due to poor solubility of this polymer in common solvents. Only recently has the successful electrospinning of polyoxymethylene nanofi bers with porous surface using a hexafl uoroisopropanol (HFIP)-based solvent been reported on. Polyoxymethylene types include impact modifi ed, fi lled and reinforced polymers in a wide range of sorts-this diversity may cause some problems during recycling by recompounding and remelting where extensive POM decomposition should be avoided because of formaldehyde release.

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Section: Sinteringmentioning

confidence: 99%

Polyoxymethylene Processing

Pielichowska¹

2014

Polyoxymethylene Handbook

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“…Very promising results have been obtained. [25][26][27][28][29] In this section, we will only focus on the calorimetry technique, which has been a crucial test to elucidate the sintering mechanism involved in HVC. Indeed, as it will be shown in the following, this technique allows preserving a fraction of the native crystallinity of the materials without reducing the quality of sintering.…”

Section: Recrystallyzation Of Polyethylenementioning

confidence: 99%

Global Techniques for Characterizing Phase Transformations – A Tutorial Review

2010

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To characterize phase transformations, it is necessary to get both local and global information. No experimental technique alone is capable of providing these two types of information. Local techniques are very useful to get information on morphology and chemistry but fail to deal with global information like phase fraction and size distribution since the analyzed volume is very limited. This is why, it is important to use, in parallel, global experimental techniques, that investigate the response of the whole sample to a stimulus (electrical, thermal, mechanical…). The aim of this paper is not to give an exhaustive list of all global experimental techniques, but to focus on a few examples of recent studies dealing with the characterization of phase transformations, namely (i) the measurement of the solubility limit of copper in iron, (ii) the tempering of martensite, (iii) the control of the crystallinity degree of a ultra high molecular weight polyethylene and (iii) a precipitation sequence in aluminum alloys. Along these examples, it will be emphasized that any global technique requires a calibration stage and some modeling to connect the measured signal with the investigated information.

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“…Combination of repeated impacts and elevated temperature makes polymer powder sintering occurring during forming. This technique allows processing semi-crystalline polymers without viscosity limitation, and appears to be well suited for POM [2], PA and UHMWPE [3]. Indeed, it has been shown that good sintering of this semi-crystalline polymer powders is possible thanks to repeated impacts at a temperature close to but below the polymer melting point.…”

Section: Introductionmentioning

confidence: 97%

Mechanical and physical charactersations of polytetrafluoroethylene by high velocity compaction

2009

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Commercially available PTFE is a thermoplastic polymer of unusually high molecular weight. PTFE cannot be manufactured with the conventional techniques used for lower molecular weight polymers such as extrusion or injection molding, and its current processing is long and expensive. A new process, High Velocity Compaction (HVC), allows processing PTFE within short processing times. In HVC, repeated impacts at a temperature close to but below the polymer melting point leads to a good sintering of semi-crystalline polymer powders. Physical and mechanical properties of PTFE processed by HVC are investigated showing that density, crystal weight fraction and wear properties are improved compared to the conventional sintering technique.

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Mechanical and physical characterization of polyoxymethylene processed by high‐velocity compaction

Cited by 23 publications

References 17 publications

Polyoxymethylene Processing

Polyoxymethylene Processing

Global Techniques for Characterizing Phase Transformations – A Tutorial Review

Mechanical and physical charactersations of polytetrafluoroethylene by high velocity compaction

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