The Thermostabilization of Polyoxymethylene Through Amine Treatment

Sun, T. J.; Ye, Lin; Zhao, Xiaowen

doi:10.1080/03602550801897745

Cited by 3 publications

(7 citation statements)

References 8 publications

(7 reference statements)

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“…It is well known that the adding of stabilizers can slow down the thermal ageing of POM [ 6 ], the onset melting temperature ( T 0 ) is a common method to judge the beginning of stabilizers consumption [ 3 ]. As shown in figure 7 , the change of the onset melting temperature indicates that there is no stabilizer consumption in the whole ageing process, because if there is stabilizer consumption, the onset melting temperature will not rise again [ 7 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Dsc Analysismentioning

confidence: 99%

“…The introduction of some thermally stable monomers (ethylene oxide, dioxolane etc.) into the chains of POM can improve its thermostability because the driving processes slow down [3] and the depression of the degradation sensitivity of POM copolymers has been investigated by several authors [4][5][6]. Now, the ageing procedure of POM copolymer is generally described as follows.…”

Section: Introductionmentioning

confidence: 99%

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Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer

Pang

Yang

et al. 2021

R. Soc. open sci.

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Thermal-oxidative ageing of polyoxymethylene (POM) copolymer in the oven at 100°C for 1, 2, 3, 5, 7, 10, 14 and 21 days and the influence of early thermal-oxidative ageing on POM structure and properties were studied by means of wide-angle X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry and tensile test. Based on the results, we found that the early thermal-oxidative ageing of POM copolymer can be divided into three regions. The region I is the initial 3 days. In this region, some molecular chains rearranged, resulting in internal stress relaxation, increase of crystallinity degree and grain size due to the perfection of crystal structure; both extended chain crystal (ECC) and folded chain crystal (FCC) increased and ECC grew faster than FCC. The region II is from 3 days to 10 days, and in this region, chain scission took place in amorphous region and led to chemi-crystallization. The region III is after 10 days. In this region, the structure and performance of POM copolymer reached a stable situation at this stage. In this work, the difference between skin and core were also analysed.

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Section: Resultsmentioning

confidence: 99%

Section: Dsc Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer

Pang

Yang

et al. 2021

R. Soc. open sci.

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“…1b). Besides, it has been reported that the mixture of polyoxymethylene with amine functional groups produces a synergistic effect in reducing formaldehyde [19,36]. As can be seen, at a low concentration of propylamine (1 and 2 wt.%), the formaldehyde emission of the POM-PA blends decreases.…”

Section: Uv-vis Spectrophotometermentioning

confidence: 96%

“…For polymer substrates, Sun et al demonstrated that the addition of hexamethylenediamine (HA) and triethanolamine (TEA) help reduced the formaldehyde emission in POM [18,19]. It has been suggested that the addition of an amine group serves three functions during melt treatment of POM; (1) absorbing the formaldehyde by an addition reaction, (2) neutralising the formic acid from the oxidised formaldehyde, and (3) promoting the hydrolytic degradation of the unstable end groups of POM into stable groups [18,19]. Mantaranon et al [20] investigated a simple reactive blending of POM with bisphenol-A and aniline [20].…”

Section: Introductionmentioning

confidence: 99%

On amine treated polyoxymethylene (POM) blends with low formaldehyde emission for metal injection moulding (MIM)

et al. 2022

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When polyoxymethylene (POM)—a common polymer used in metal injection moulding feedstock—is exposed to heat and oxygen during compounding, it can be easily decomposed, releasing undesired gaseous formaldehyde products. In order to reduce the formaldehyde emission from POM, amine treatment was performed. The effectiveness of propylamine at different concentrations and its role as a formaldehyde scavenger was studied via the UV–vis Spectrophotometry, Fourier Transform Infra-red, Thermogravimetric Analysis, Scanning Electron Microscopy, and melt flow index. The results proved that a simple amine, such as propylamine, is a promising candidate for scavenging formaldehyde in POM. It is also demonstrated that the best concentration of propylamine is 2 wt.% (POM-PA2) with a minimum formaldehyde emission of 1.44 mg/L. Further, when used in formulating metal injection moulding feedstock (MIM), the POM-PA2 reveals good rheological properties and high green strength. These advantages make the modified polyoxymethylene (POM-PA2) a promising binder system for MIM feedstock.

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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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The Thermostabilization of Polyoxymethylene Through Amine Treatment

Cited by 3 publications

References 8 publications

Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer

Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer

On amine treated polyoxymethylene (POM) blends with low formaldehyde emission for metal injection moulding (MIM)

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

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