Urethane — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Urethane tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.

Karakteristiske FTIR-toppe for Urethane

Viser de 30 bedst understøttede toppe ud af 78 i alt for Urethane.

Spektrumlogik

En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.

Anvendelse i virkeligheden

Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.

Almindelige fejl

• Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
• Antager, at det stærkeste bånd altid er det mest diagnostiske.
• At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.

Verifikationsrådgivning

Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.

Litteratur bag disse tildelinger

• 1698 cm⁻¹ tillid 1,0

  “The peaks at 1698cm-1 and correspond to the urethane carbonyl, and hydrogen”

  Two-component waterborne polyurethane_ Curing process study using dynamic in situ IR spectroscopy DOI: 10.1016/j.polymertesting.2018.05.021
• 1725 cm⁻¹ tillid 1,0

  “All spectra are cm-1, characterized by a major band centred at 1725 ascribed to the cm-1, free C O urethane groups, and another peak at about 1700”

  Hydrogen bonding and thermomechanical properties of model polydimethylsiloxane based poly(urethane-urea) copolymers: Effect of hard segment content DOI: 10.1016/j.porgcoat.2015.06.015
• 1081 cm⁻¹ tillid 1,0

  “Moreover, the weak adsorption band at 1081.34 is related to symmetric stretching in cm(cid:0) 1 P-CH3 the urethane group [3,37,61,79,83].”

  Biologically-induced synthetic manganese carbonate precipitate (BISMCP) for potential applications in heavy metal removal DOI: 10.1016/j.heliyon.2023.e15919
• 3317 cm⁻¹ tillid 1,0

  “The cm-1 FT-IR spectrum of semi-rigid PU shows the existence of absorption at 3317 corresponding to the N-H stretching vibration of urethane function.”

  Preparation of one-shot and two-shot method of semi-rigid polyurethane film based on functionalized liquid natural rubber DOI: 10.1063/1.5047200
• 3317 cm⁻¹ tillid 1,0

  “1, the key feature of the fully formed semi-rigid PU is the absorption band cm-1 at 3317 corresponding to the urethane N-H”

  The behavior of semi-rigid polyurethane film based on functionalized rubber by one-shot and two-shot method preparation DOI: 10.1007/s10853-018-2578-8
• 1537 cm⁻¹ tillid 1,0

  “tense stretching peak at 1730 cm-1 corresponding to carbonyl groups (C=O), an amide Nthermal, morphological, and physical properties of the EQUIA coat with and without H absorption band at 1537 cm-1 was observed due to the presence of ureth”

  Structural, Physical, and Mechanical Analysis of ZnO and TiO2 Nanoparticle-Reinforced Self-Adhesive Coating Restorative Material DOI: 10.3390/ma14247507
• 1537 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  A study of molecular architectural dynamics of crosslinked urethane during photo-aging by two-dimensional infrared correlation spectroscopy DOI: 10.1016/j.polymdegradstab.2020.109242
• 1729 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Jana 等 - 2009 - Molecular Orientation of Polyurethane Based Liquid DOI: 10.1080/10601320903158719