Study on the Thermal Stabilization Effect of Polyamide on Polyoxymethylene

Hu, Youliang; Ye, Lin

doi:10.1080/03602550600614002

Cited by 11 publications

(3 citation statements)

References 7 publications

(9 reference statements)

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“…Polyoxymethylene (POM) is a well-known thermoplastic engineering resin that exhibits good mechanical properties, stiffness, creep and fatigue resistance, moldability, and excellent chemical resistance [ 1 ]. POM is widely used in many different applications, such as automotive applications, some parts of precision machines, and electrical and electronic applications, as well as in biomedical applications [ 2 , 3 ]. Due to its excellent mechanical properties in the latter field, POM can be applied in bone tissue replacement [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization, and Bioactivity Evaluation of Polyoxymethylene Copolymer/Nanohydroxyapatite-g-Poly(ε-caprolactone) Composites

et al. 2022

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In this work, nanohydroxyapatite (HAp) was functionalized with poly(ε-caprolactone) (PCL), using 1,6-hexamethylene diisocyanate (HDI) as a coupling agent, and then incorporated into the polyoxymethylene copolymer (POM) matrix using the extrusion technique. The obtained POM/HAp-g-PCL composites were investigated using FTIR, DSC, TOPEM DSC, and TG methods. Mechanical properties were studied using destructive and non-destructive ultrasonic methods, wettability, and POM crystallization kinetics in the presence of HAp-g-PCL. Moreover, preliminary bioactivity evaluation of the POM/HAp-g-PCL composites was performed using the Kokubo method. It was found that the introduction of HAp-g-PCL to the POM matrix has a limited effect on the phase transitions of POM as well as on its degree of crystallinity. Importantly, HAp grafted with PCL caused a significant increase in the thermal stability of the POM, from 292 °C for pristine POM to 333 °C for POM modified with 2.5% HAp-g-PCL. If unmodified HAp was used, a distinct decrease in the thermal stability of the POM was observed. Crystallization kinetic studies confirmed that HAp-g-PCL, in small amounts, can act as a nucleating agent for the POM crystallization process. Moreover, incorporation of HAp-g-PCL, although slightly decreasing the mechanical properties of POM composites, improved the crucial parameter in biomedical applications, namely the in vitro bioactivity.

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Section: Introductionmentioning

confidence: 99%

Preparation, Characterization, and Bioactivity Evaluation of Polyoxymethylene Copolymer/Nanohydroxyapatite-g-Poly(ε-caprolactone) Composites

et al. 2022

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“…Mechanical properties of electrospun POM fi bers were diff erent from that of bulk materials, especially elongation at break, which was 460%-about 10 times more than that measured for injection-molded POM [116]. Th e high elongation of the electrospun mat was related to fi ber and molecular orientation during stretching, lower degree of crystallinity, and smaller crystal size [115].…”

Section: Pom Nanostructures -Electrospun Pom Nanofi Bersmentioning

confidence: 90%

Nanocomposites of Polyoxymethylene

Leszczyńska¹,

Pielichowski²

2014

Polyoxymethylene Handbook

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Recent research results in the area of nanocomposites and nanostructured materials based on polyoxymethylene (POM) are reviewed in this chapter. Improvement of diff erent properties, such as mechanical strength, electrical conductivity, tribological properties, thermal stability and biocompatibility, are reported for these new POM-based materials, which indicate their high potential in structural and functional applications. As nanofi llers for POM-layered silicates, fullerenes, carbon nanotubes and nanofi bers, polysilsesquioxanes (POSS), nanostructural hydroxyapatite or nanoparticulate oxides such as titanium dioxide, nanosilica, zirconium oxide and zinc oxide, are applied. Nanocomposites based on POM and diff erent types of nanofi llers reveal superior properties compared to conventional POM composites, but the amount of additive remains lower. Th e infl uence of nanofi ller type, manufacturing techniques, role of interfacial properties and kind of applied surface modifi cation of nanoparticles on the control of generated nanostructure is discussed. Moreover, complex morphology and properties of electrospun POM nanofi bers are analyzed with respect to the nanomaterials manufacturing conditions.

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“…As antioxidants for POM thermostabilization arylamines or phenols are widely applied [10,11]. Hu and Ye [12] investigated polyamide incorporation effect on the POM thermal stability, and the obtained results demonstrated remarkable thermal stabilization effect. Sun et al [13] investigated thermostabilization of POM via amine treatment; it was postulated that amines can deactivate Lewis acid derived from the residual initiator and formic acid formed in situ by oxidation of formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

The effect of functionalized hydroxyapatite on the thermal degradation behaviour and flammability of polyoxymethylene copolymer

Król-Morkisz

Byczyński

Majka

et al. 2022

J Therm Anal Calorim

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In this work, the effect of functionalized hydroxyapatite (HAp-g-PEG) on the thermal degradation behaviour and flammability of polyoxymethylene copolymer (POM_C) was investigated. Organic–inorganic hybrid additive, obtained by grafting of poly(ethylene glycol) on HAp surface using 1,6-hexamethylene diisocyanate as a linker, has been incorporated into POM matrix through an extrusion process. TG analyses show that the incorporation of HAp-g-PEG into POM_C leads to the significant improvement in the thermal stability of the polymer matrix. This is an important finding as POM, being an engineering polymer, suffers from a relatively low thermal stability that limits processing options to develop advanced composite materials. Based on TG results kinetic parameters of the thermal degradation process using Friedman isoconversional method and nonlinear regression method have been calculated; an increase in activation energy of POM degradation process after incorporation of HAp-g-PEG has been found. Thermoanalytical analyses (TG-FTIR/MS) show that incorporation of HAp-g-PEG has no significant effect on the composition of the thermal degradation products. Flammability investigations showed small effect of HAp-g-PEG 600 on the burning time and rate, however, there was a significant reduction in the amount of dripping during the material’s burning process.

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Study on the Thermal Stabilization Effect of Polyamide on Polyoxymethylene

Cited by 11 publications

References 7 publications

Preparation, Characterization, and Bioactivity Evaluation of Polyoxymethylene Copolymer/Nanohydroxyapatite-g-Poly(ε-caprolactone) Composites

Preparation, Characterization, and Bioactivity Evaluation of Polyoxymethylene Copolymer/Nanohydroxyapatite-g-Poly(ε-caprolactone) Composites

Nanocomposites of Polyoxymethylene

The effect of functionalized hydroxyapatite on the thermal degradation behaviour and flammability of polyoxymethylene copolymer

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