Dip or Step-Like Features in the Infrared Reflection Spectra of Heat-Treated Polyoxymethylene

Abstract

When injection-molded polyoxymethylene is heat-treated below its melting point, it shows increased polarized reflection along the injection direction, as confirmed through micro-infrared spectroscopy. A characteristic dip or step-like structure appears around 940 cm⁻¹. Previously, the origin of this structure was unclear. However, we have found that it can be explained by refining the calculation model to account for the relative permittivity perpendicular to the sample surface.

Graphical abstract

This is a visual representation of the abstract.

Keywords

Polyoxymethylene infrared IR relative permittivity reflection dip step-like structure anisotropy Reststrahlen off-normal incidence leakage effect

Get full access to this article

View all access options for this article.

References

Terlemezyan

Mihailov

Schmidt

Schneider

. “Conformational Changes of Poly(oxymethylene) Induced by Pressure and Mechanical Treatment”. Makromol. Chem. 1978. 179(3): 807–813. https://doi.org/10.1002/macp.1978.021790322

Terlemezyan

Mihailov

Schmidt

Schneider

. “Temperature Changes of Poly(oxymethylene) Structures Studied by Infrared Spectroscopy”. Makromol. Chem. 1978. 179(9): 2315–2322. https://doi.org/10.1002/macp.1978.021790918

Terlemezyan

Mihailov

. “Dependence of the Conformation of Nascent Poly(oxymethylene) on the Conditions of Cationic Polymerization of Trioxane in Solution”. Eur. Polym. J. 1981. 17(11): 1115–1120. /https://doi.org/10.1016/0014-3057(81)90171-3

Kobayashi

Sakashita

. “Morphology Dependent Anomalous Frequency Shifts of Infrared Absorption Bands of Polymer Crystals: Interpretation in Terms of Transition Dipole–Dipole Coupling Theory”. J. Chem. Phys. 1992. 96(1): 748–760. https://doi.org/10.1063/1.462460

Tanabe

Shimomura

. “A2 Mode Vibration in Infrared Absorption Spectrum of Trigonal Poly(oxymethylene)”. Macromolecules. 1990. 23(23): 5031–5034. https://doi.org/10.1021/ma00225a025

Nagai

Okada

Amaki

Okamura

, et al. “Anomalous High-Infrared Reflectance of Extruded Polyoxymethylene”. AIP Advances. 2020. 10(9): 095201. https://doi.org/10.1063/5.0020445

Nagai

Okawara

Kijima

. “Infrared Response of Sub-Micron-Scale Structures of Polyoxymethylene: Surface Polaritons in Polymers”. Appl. Spectrosc. 2016. 70(8): 1278–1291. https://doi.org/10.1177/0003702816653577

Nagai

Okada

Hasegawa

. “Morphology-Sensitive Infrared Absorption Bands of Polymers Derived from Surface Polaritons”. AIP Advances. 2019. 9(10): 105203. https://doi.org/10.1063/1.5116280

Laramée

A.W.

, Lanthier

Pellerin

. “Electrospinning of Highly Crystalline Polymers for Strongly Oriented Fibers”. Appl. Polym. Mater. 2020. 2(11): 5025–5032. https://doi.org/10.1021/acsapm.0c00873

10.

Laramée

A.W.

Roy

Pellerin

. “Electrospun Materials with High Reflectance and Polarization Contrast for Sensing Applications in the Mid-Infrared Atmospheric Window”. Appl. Polym. Mater. 2024. 6(12): 6997–7005. https://doi.org/10.1021/acsapm.4c00565

11.

Amaki

Okada

Nagai

. “Structural Analysis of Injection-Molded Polyoxymethylene Treated Below a Melting Point Using Field-Emission Scanning Electron Microscopy and Infrared Spectroscopy”. Appl. Spectrosc. 2022. 76(6): 699–711. https://doi.org/10.1177/00037028221078050

12.

Berreman

D.W.

. “Anomalous Reststrahl Structure from Slight Surface Roughness”. Phys. Rev. 1967. 163(3): 855–864. https://doi.org/10.1103/PhysRev.163.855

13.

Kurosawa

. “Polarization Waves in Solids”. J. Phys. Soc. Jpn. 1961. 16(7): 1298–1308. https://doi.org/10.1143/JPSJ.16.1298

14.

Gervais

Piriou

. “Anharmonicity in Several-Polar-Mode Crystals: Adjusting Phonon Self-Energy of LO and TO Modes in Al₂O₃ and TiO₂ to Fit Infrared Reflectivity”. J. Phys. C. 1974. 7(13): 2374–2386. https://doi.org/10.1088/0022-3719/7/13/017

15.

Barker

A.S.

Jr. Ilegems

. “Infrared Lattice Vibrations and Free-Electron Dispersion in GaN”. Phys. Rev. 1973. B7(2): 743–750. https://doi.org/10.1103/PhysRevB.7.743

16.

Duarte

J.L.

Sanjurjo

J.A.

Katiyar

R.S.

. “Off-Normal Infrared Reflectivity in Uniaxial Crystals: α-LiIO₃ and α-Quartz”. Phys. Rev. 1987. B36(6): 3368–3372. https://doi.org/10.1103/PhysRevB.36.3368

17.

Gonzalez

R.J.

Zallen

Berger

. “Infrared Reflectivity and Lattice Fundamentals in Anatase TiO₂”. Phys. Rev. 1997. B55(11): 7014–7017. https://doi.org/10.1103/PhysRevB.55.7014

18.

Moret

M.P.

Zallen

Newnham

R.E.

Joshi

P.C.

Desu

S.B.

. “Infrared Activity in the Aurivillius Layered Ferroelectric SrBi₂Ta₂O₉”. Phys. Rev. 1997. B57(10): 5715–5723. https://doi.org/10.1103/PhysRevB.57.5715

19.

Nagai

. “Azimuth Angle Dependence of Polarized Infrared Spectra of Injection-Molded Polyoxymethylene”. Appl. Spectrosc. 2024. 78(2): 197–208. https://doi.org/10.1177/00037028231217005

20.

Tan

C.Z.

Chen

. “Generation of Mutual Coherence of Eigenvibrations in α-Quartz at Infrared Frequencies by Incidence of Randomly Polarized Waves”. Appl. Phys. B. 2007. 86: 129–137. https://doi.org/10.1007/s00340-006-2470-0

Supplementary Material

Please find the following supplemental material available below.

For Open Access articles published under a Creative Commons License, all supplemental material carries the same license as the article it is associated with.

For non-Open Access articles published, all supplemental material carries a non-exclusive license, and permission requests for re-use of supplemental material or any part of supplemental material shall be sent directly to the copyright owner as specified in the copyright notice associated with the article.

0.00 MB

1.39 MB