Micro‐structure and characteristics of highly oriented polyoxymethylene obtained by press and biaxial drawing

Takasa, Kenji; Miyashita, Norikazu; Takeda, Kunihiko

doi:10.1002/app.22693

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Although the melt spinning of POM fiber was reported in literature, these studies mainly covered the relationship of the orientation degree, take‐up speed, and mechanical properties. For instance, several studies have reported that the orientation degree of lamellar stacks of POM is proportional to the take‐up speed . In the present study, the POM fiber is produced by melt spinning with a high take‐up speed.…”

Section: Introductioncontrasting

confidence: 98%

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Formation of a large‐scale shish‐kebab structure of polyoxymethylene in the melt spinning and the crystalline morphology evolution after hot stretching

Zhou

Liu

et al. 2014

Polymers for Advanced Techs

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Polyoxymethylene (POM) fiber was produced by melt spinning with a high take-up speed, which imposed a strong flow field. An unexpected formation of a shish-kebab morphology with multiple shish of POM fibers was reported for the first time. This morphology is a large-scale shish kebab with a diameter of 10.5 μm. Further orientation of the POM fiber was obtained by hot stretching twice at 160°C. Two crystalline morphology evolution processes were also observed: (i) the process from the large-scale shish-kebab to the deformed small shish-kebab and (ii) the process from the deformed small shish-kebab to the perfect whiskers. Compared with the melt spinning fiber, fiber tensile strength with first and second hot stretching increased by 976% and 1705%, respectively. The crystalline melting behavior of fibers significantly changes after the first and second hot stretching. The flow field induces a large number of extended chain crystals.

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Section: Introductioncontrasting

confidence: 98%

“…For instance, several studies have reported that the orientation degree of lamellar stacks of POM is proportional to the take-up speed. [45,46] In the present study, the POM fiber is produced by melt spinning with a high takeup speed. A strong shear flow field and orientation on the monofilament during crystallization are imposed.…”

Section: Introductionmentioning

confidence: 99%

Formation of a large‐scale shish‐kebab structure of polyoxymethylene in the melt spinning and the crystalline morphology evolution after hot stretching

Zhou

Liu

et al. 2014

Polymers for Advanced Techs

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“…Takasa et al [140] studied the physical structure of oriented POM drawn in two steps by press drawing and subsequent simultaneous biaxial drawing. In the press drawing, the draw ratio reached 6.0 and the tensile modulus was 4.5 GPa, whereby the degree of crystallinity decreased from 70% to 65%.…”

Section: Highly Oriented Productsmentioning

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 resultant biaxial orientation of molecules can often balance them. Therefore, biaxial drawing, including simultaneous or sequential techniques, is widely adopted for manufacturing polymer thin membranes of PE, − PTFE, − poly(propylene), − poly(ethylene terephtalate) (PET), ,, poly(lactic acid), − polyamide, polystyrene, and poly(oxymethylene) . These biaxially drawn membranes are industrially utilized as solar cells or display panels. − Sequential drawing facilitate a continuous production line, resulting in superior cost performance; however, simultaneous drawing provides better homogeneity of the mechanical properties due to the radial molecular orientation within the resultant membranes.…”

Section: Introductionmentioning

confidence: 99%

Property Development for Biaxial Drawing of Ethylene-Tetrafluoroehtylene Copolymer Films and Resultant Fractural Behavior Analyzed by in Situ X-ray Measurements

et al. 2015

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The property development of the ethylene-tetrafluoroethylene copolymer (ETFE) membrane induced by simultaneous biaxial drawing was investigated. Commonly, tensile strength can be increased by drawing; conversely, tear resistance decreases. In this study, the balance between tensile strength and tear resistance for the resultant ETFE membrane was optimized achieved by a combination of lamination of low molecular weight (LMW) and high molecular weight (HMW) layers and subsequent biaxial drawing. The structural factor determining tear resistance of these biaxially drawn membranes was determined based on in situ small-angle X-ray scattering (SAXS) measurement during tensile deformation simulating tearing tests. Lozenge shaped scattering, which indicated inclined lamellae, was observed during such tensile deformation of the resultant membranes. Remarkably, this inclined lamellar structure was observed for the pure LMW membrane; however, it also appeared at the interface between LMW and HMW layers within biaxially drawn membranes. For the membrane exhibiting the highest tearing strength, the fraction of such inclined lamella increased up to the critical strain corresponding to the actual sample breaking. These results confirm that the inclined lamellar structure absorbed strain during membrane tearing.

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Micro‐structure and characteristics of highly oriented polyoxymethylene obtained by press and biaxial drawing

Cited by 5 publications

References 12 publications

Formation of a large‐scale shish‐kebab structure of polyoxymethylene in the melt spinning and the crystalline morphology evolution after hot stretching

Formation of a large‐scale shish‐kebab structure of polyoxymethylene in the melt spinning and the crystalline morphology evolution after hot stretching

Polyoxymethylene Processing

Property Development for Biaxial Drawing of Ethylene-Tetrafluoroehtylene Copolymer Films and Resultant Fractural Behavior Analyzed by in Situ X-ray Measurements

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