Property changes in polyoxymethylene (POM) resulting from processing, ageing and recycling

Archodoulaki, Vasiliki‐Maria; Lüftl, Sigrid; Koch, Thomas; Seidler, Sabine

doi:10.1016/j.polymdegradstab.2007.02.024

Cited by 58 publications

(27 citation statements)

References 9 publications

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“…Degradation of commercially available POM samples may be avoided by adopting the processing conditions recommended by the producer [62], being generally suffi cient not exceeding a limit temperature value.…”

Section: Structure-properties Relationshipsmentioning

confidence: 99%

Structure and Morphology of Polyoxymethylene

Raimo¹

2014

Polyoxymethylene Handbook

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Polyoxymethylene (POM), its blends and composites, show high mechanical strength, excellent abrasion and fatigue resistances, lubricating properties and moldability, and therefore have a variety of applications. Properties of substances depend on the composition, crystalline structure and, particularly for polymer materials, on morphology generated by preparation or crystallization conditions. Th ese factors are thoroughly discussed in this chapter as they are very important to control the fi nal properties of materials. Th e knowledge of a variety of atomic, molecular and supermolecular assemblies of materials, together with the mechanical performances and other chemico-physical properties herein described, allows the identifi cation and use of the most appropriate POM sample for a specifi c application. Th e eff ect of additives on the POM morphology and properties has also been analyzed, beyond orientation, perfection and size of crystals in neat POM.

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Section: Structure-properties Relationshipsmentioning

confidence: 99%

Structure and Morphology of Polyoxymethylene

Raimo¹

2014

Polyoxymethylene Handbook

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“…Archodoulaki et al [152] investigated the POM degradation processes initiated by thermomechanical and thermo-oxidative loading as well as by exposure to ultraviolet irradiation (weathering) resulting from processing, ageing and recycling. A large number of reactions take place during processing, and even small changes in the molecular structure result in considerable modifi cation of properties (Figure 4.17) [152].…”

Section: Recycling Of Production Wastementioning

confidence: 99%

“…A large number of reactions take place during processing, and even small changes in the molecular structure result in considerable modifi cation of properties (Figure 4.17) [152].…”

Section: Recycling Of Production Wastementioning

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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“…The homopolymer POM is a chain of alternating methyl groups linked to an oxygen molecule. In this sense, as a homopolymer, POM has good mechanical properties; also, as a copolymer, POM has longterm stability [22,23].…”

Section: Introductionmentioning

confidence: 99%

Retentive force comparison between esthetic and metal clasps for removable partial denture

Yamamoto

Sato

Silva

et al. 2017

BDS

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Objective: This study aimed to evaluate the retention of acetate resin clasp as when compared to metal clasp. Material and methods: For this purpose, we constructed 10 conventional Co-Cr metal clasps (Ackers) and 20 acetate resin clasps. The acetate resin clasps had the opposition, support and retaining arms made of Co-Cr. Of the 20 esthetic clasps, 10 had the thickness of the retention arm decreased to make it more esthetic. The initial retentive force of the specimens was tested in a universal testing machine through tensile test. After that, the specimens were subjected to 7,000 cycles, each one, in an adapted machine, immersed into artificial saliva, for 36 months of simulated clinical use of a removable partial denture. Data were tabulated for statistical analysis of the retention effectiveness. Results: After cycling, 3-mm-thick and 2-mm-thick acetate resin clasps lost more retention than metal clasps. The material type (p=0.0000) and cycling (p=0.0039) showed a significant effect, but the material/cycling interaction (p=0.1436) did not. Conclusions: Therefore, esthetic clasps presented retention force lower than that of metal clasps. Notwithstanding, the esthetic clasps can be used in clinical cases requiring minimum retention. KeywordsRemovable partial denture; Esthetic clasp; Metal clasp.

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Property changes in polyoxymethylene (POM) resulting from processing, ageing and recycling

Cited by 58 publications

References 9 publications

Structure and Morphology of Polyoxymethylene

Structure and Morphology of Polyoxymethylene

Polyoxymethylene Processing

Retentive force comparison between esthetic and metal clasps for removable partial denture

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