Effects of electron beam irradiation on tribological and physico-chemical properties of Polyoxymethylene copolymer (POM-C)

Rahman, Md. Shahinur; Shaislamov, Ulugbek; Yang, Jong-Keun; Kim, Jong‐Kuk; Yu, Young Hun; Choi, Sun Keun; Lee, Heon-Ju

doi:10.1016/j.nimb.2016.10.001

Cited by 15 publications

(8 citation statements)

References 27 publications

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“…e strong absorption bands at 1089 cm −1 and 891 cm −1 and the weak band at 1136 cm −1 are attributed to the asymmetric stretching and the band at 933 cm −1 is due to the symmetric stretching of C-O-C groups. e O-C-O bending vibration peak appears at 630 cm −1 [46]. No changes in the FTIR band position for all composites were detected.…”

Section: Xrd and Ftir-atr Results Of Pom/ha-g-pegmentioning

confidence: 88%

“…e measurements of the wetting angle of POM/HA-g-PEG composites in Figure 9 show quite a signi cant in uence of the hybrid additive on POM wettability. e contact angle of unmodi ed POM was 75.6° ± 1.5°, which is a characteristic value for POM [46,48]. Changes in POM wettability depend on the molar mass of PEG and its content in composites.…”

Section: Mechanical Properties Of Pom/ Ha-g-peg Compositesmentioning

confidence: 93%

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Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

Król-Morkisz

Karaś

Majka

et al. 2019

Advances in Polymer Technology

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Nanostructured hydroxyapatite (HA) functionalized with poly(ethylene glycol) (HA-g-PEG) of different molar mass was used as a thermal stabilizer to prepare polyoxymethylene (POM) composites by a melt processing method. The chemical and crystalline structure of (HA-g-PEG) and POM/HA-g-PEG composites was investigated by means of FTIR and XRD. The thermal properties, degree of crystallinity, and melting behaviour of POM-based composites were analysed with TG, DSC, and TOPEM DSC methods. The tensile strength, Young’s modulus, toughness, and wettability of POM were investigated as well. A preliminary assessment of bioactivity, in vitro chemical stability, and formaldehyde release from POM/HA-g-PEG composites by Schiff’s test was also performed. An SEM/EDX method was used to observe the morphology of POM/HA-g-PEG composites. The results indicate that the addition of 1% HA-g-PEG slightly increases the melting temperature and degree of crystallinity. In small amounts, HA-g-PEG particles probably act as nucleating agents for the POM crystallization process. Incorporation of 5% HA-g-PEG to POM caused a decrease in the crystallinity of the polymer matrix, as a result, some mechanical properties of POM/HA-g-PEG composites also decreased. The thermal stability of POM/HA-g-PEG composites improved significantly from 309°C for unmodified POM to 342°C for POM/10.0% HA-g-PEG 600. The most effective thermal stabilizer was synthesized with the lowest mass-average molar mass PEG. The in vitro bioactivity test confirmed that, as the average molar mass of PEG in HA-g-PEG hybrids increased, POM-based composites indicated higher bioactivity. The in vitro chemical stability analysis results showed that both the POM matrix and the HA-g-PEG additive remain stable during the whole incubation time. Importantly, after seven days of dynamic incubation, no formaldehyde was detected in all filtrates, which is crucial in biomedical applications, among others.

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Section: Xrd and Ftir-atr Results Of Pom/ha-g-pegmentioning

confidence: 88%

Section: Mechanical Properties Of Pom/ Ha-g-peg Compositesmentioning

confidence: 93%

Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

Król-Morkisz

Karaś

Majka

et al. 2019

Advances in Polymer Technology

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“…The two absorption bands at 2981 and 2923 cm −1 can be attributed to symmetric stretching vibrations (ν) of CH 2 groups, absorption band at 1468 cm −1 to bending vibrations (δ) and band at 1381 cm −1 to the wagging vibrations of the same groups [ 17 , 18 ]. Strong absorption bands at 1090 cm −1 arise from stretching vibrations of C-O-C groups [ 19 , 20 ]. It should be noted that in the FTIR spectra, no changes in band position for any POM/HAp-g-PCL composites were found.…”

Section: Resultsmentioning

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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“…There were no significant differences in the precision of the results of the contact angle among the procedures. The reported values of contact angle for water on POM using the sessile drop method are 73.5 [34], 75.9° [32], 77±2º [30], 78±2º [31] and 84.9 [33]. On the other hand, the values of contact angle for methylene iodide using the sessile drop ranged between 37.5° [35] and 55.5° [34].…”

Section: Contact Angle Of Water and Methylene Iodide Drops On Ptfe Anmentioning

confidence: 99%

Construction and calibration of a goniometer to measure contact angles and calculate the surface free energy in solids with uncertainty analysis

Schuster

Schvezov

Rosenberger

2018

International Journal of Adhesion and Adhesives

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Here, we present the construction and calibration of a low-cost goniometer to measure contact angles by the sessile drop method. Besides, we propose a simple and fast method to calculate the uncertainty in the determination of the surface free energy (SFE) and its polar and dispersive components through the Owens-Wendt model and tested it by using two testing liquids. The goniometer performance and the SFE uncertainty were determined on two polymers: polytetrafluorethylene (PTFE) and polyoxymethylene (POM), by using water and methylene iodide. The values of contact angle measured were used to calculate the SFE and its components with their errors. The SFE values obtained for PTFE were 17.57-17.91 mJ/m 2 , with a relative error lower than 5.5 %, whereas those for POM were 42.80-43.23 mJ/m 2 , with a relative error lower than 4.3%. Both the SFE values and the errors were in the range of those previously reported. Based on the mathematical analysis of the uncertainty propagation in the determination of SFE, we concluded that the uncertainty is minimized when the testing liquids are an apolar liquid and water.

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Effects of electron beam irradiation on tribological and physico-chemical properties of Polyoxymethylene copolymer (POM-C)

Cited by 15 publications

References 27 publications

Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

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

Construction and calibration of a goniometer to measure contact angles and calculate the surface free energy in solids with uncertainty analysis

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