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

Li, Lin; Zhou, Tao; Liu, Jianzhong; Ran, Qianping; Ye, Guangdou; Zhang, Jihai; Liu, Pengqing; Zhang, Aiming; Yang, Zhiqian; Xu, D.; Liu, Jiaping

doi:10.1002/pat.3422

Cited by 7 publications

(6 citation statements)

References 52 publications

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“…[1][2][3] The tribological behavior of polymer-based materials is of great importance since a variety of engineering plastics, such as polyoxymethylene (POM), [4][5][6] polyetheretherketone (PEEK), 7,8 and polyphenylene sulfide (PPS), 9,10 have been ubiquitously utilized in the areas of automotive, machinery, instruments, among others. POM exhibits a typical helical chain structure 11 which is composed of alternating carbon-hydrogen bonds. As a result, POM displays a high degree of regularity in its molecular chain, which endows POM with outstanding solvent resistance and selflubricating nature.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the mechanical, tribological, and thermal properties of POM composites filled with different PTFE

Zhang

Liang

et al. 2020

Journal of Thermoplastic Composite Materials

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In this study, two different types of polytetrafluoroethylene (PTFE) fillers (i.e. fibrillar and particulate PTFE) were utilized to improve the tribological properties of polyoxymethylene (POM). POM/PTFE composites with various filler contents were tested on a commercial block-on-ring tester. To further probe the tribological properties of POM/PTFE composites under severe sliding conditions, a homemade pin-on-disc tester was employed. Results showed that the lowest coefficient of friction and wear rate are obtained from PTFE particle–filled POM composites at 20 wt%, which is attributed to the formation of uniform transfer film at the sliding interface thanks to the well distribution of PTFE particles. The mass wear rate of POM/PTFE fiber composites is lower than that of PTFE particle–containing counterparts due to the better load transfer of high aspect ratio fibers. The tensile properties of POM/PTFE composites deteriorate with the addition of PTFE fillers; however, the impact strength is significantly enhanced for PTFE fiber filled POM composites. Moreover, both the melting and crystallization properties of POM are affected by the morphology of PTFE fillers and filler concentration, as characterized by differential scanning calorimetry analysis.

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Section: Introductionmentioning

confidence: 99%

Comparative study on the mechanical, tribological, and thermal properties of POM composites filled with different PTFE

Zhang

Liang

et al. 2020

Journal of Thermoplastic Composite Materials

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“…Polyoxymethylene (POM), one of the most important engineering thermoplastics known as “comparable steel” and “plastic metal,” has excellent mechanical and electrical properties, outstanding dynamic fatigue resistance, low friction, and abrasion resistance and therefore been widely used for production of precise components in automotive, mechanical and electronic fields, such as transmission elements, connectors, instruments and zippers, and so forth …”

Section: Introductionmentioning

confidence: 99%

“…Due to the marked flexibility of the molecular chains, it crystallizes fairly quickly with a crystallinity as high as about 85% in forms of coarse crystalline grains . The high crystallinity contributes to the high tensile strength, high stiffness and hardness, and so forth, which make it an excellent engineering plastics . However, the high crystallinity leads to significant shrinkage (around 3–3.5%) of the products during molding because of the apparent density difference between the crystalline (1.49 g/cm 3 ) and amorphous (1.21 g/cm 3 ) phases .…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of thermoplastic phenolic resin and multiwalled carbon nanotubes on the crystallization of polyoxymethylene

Xue

Gao

et al. 2020

Journal of Polymer Science

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To reduce the crystallization rate of polyoxymethylene (POM) to meet the requirement of thick‐walled and large‐sized articles production, and maintain high crystallinity as well as obtain refined crystalline grains to ensure the strength and stiffness simultaneously, thermoplastic phenolic resin (PF) and multiwalled carbon nanotubes (MWCNTs) were used as crystal growth inhibitor and nucleating agent, respectively, and their effects on the crystallization of POM were studied in details. The results showed that PF is an effective inhibitor and MWCNTs exhibits excellent nucleation effect on POM. Based on the obtained results, their synergistic influences on the crystallization process of POM were investigated. It is found that the objective of decreasing the crystallization rate while maintaining high crystallinity and forming fine crystalline grains can be realized. The 97/3/1 wt% POM/PF/MWCNTs, compared with those of neat POM, The T c shifts by 3.3°C to a lower temperature, the crystallization enthalpy increases by 16.1 J/g and the full width at half‐maximum widens by 48.5%. The modulation effect of PF and MWCNTs on the crystallization is closely related to the PF content and dispersion, the distribution and dispersion of MWCNTs in the PF and POM phases.

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“…Uniaxial hot-stretching, a method to achieve high orientation of polymer materials under the action of external force, realizes a secondary uniform dispersion of the fillers along the orientation direction. In addition, the hot-stretching technology can effectively promote the regularity of polymer molecular chains and improve their crystallinity [23,24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Achieving Secondary Dispersion of Modified Nanoparticles by Hot-Stretching to Enhance Dielectric and Mechanical Properties of Polyarylene Ether Nitrile Composites

Wang

Tong

et al. 2019

Nanomaterials

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Enhanced dielectric and mechanical properties of polyarylene ether nitrile (PEN) are obtained through secondary dispersion of polyaniline functionalized barium titanate (PANI-f-BT) by hot-stretching. PANI-f-BT nanoparticles with different PANI content are successfully prepared via in-situ aniline polymerization technology. The transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopic instrument (XPS) and Thermogravimetric analysis (TGA) results confirm that the PANI layers uniformly enclose on the surface of BaTiO3 nanoparticles. These nanoparticles are used as functional fillers to compound with PEN (PEN/PANI-f-BT) for studying its effect on the mechanical and dielectric performance of the obtained composites. In addition, the nanocomposites are uniaxial hot-stretched by 50% and 100% at 280 °C to obtain the oriented nanocomposite films. The results exhibit that the PANI-f-BT nanoparticles present good compatibility and dispersion in the PEN matrix, and the hot-stretching endows the second dispersion of PANI-f-BT in PEN resulting in enhanced mechanical properties, crystallinity and permittivity-temperature stability of the nanocomposites. The excellent performances of the nanocomposites indicate that a new approach for preparing high-temperature-resistant dielectric films is provided.

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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

Cited by 7 publications

References 52 publications

Comparative study on the mechanical, tribological, and thermal properties of POM composites filled with different PTFE

Comparative study on the mechanical, tribological, and thermal properties of POM composites filled with different PTFE

Synergistic effect of thermoplastic phenolic resin and multiwalled carbon nanotubes on the crystallization of polyoxymethylene

Achieving Secondary Dispersion of Modified Nanoparticles by Hot-Stretching to Enhance Dielectric and Mechanical Properties of Polyarylene Ether Nitrile Composites

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