Oxygen heterocycle — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Oxygen heterocycle 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 Oxygen heterocycle

Viser de 30 bedst understøttede toppe ud af 170 i alt for Oxygen heterocycle.

Mulige materialer

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

• 810 cm⁻¹ tillid 1,0

  “It is worth mentioning that the peak at 810 (figure 8(c)) which corresponds to 27 28 the epoxy ring in AESO structure has gradually become weaker and almost disappeared after 30”

  Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754
• 1700 cm⁻¹ tillid 1,0

  “It is rather interesting to detect a carboxyl group's peak (C=O) at 1700 cm-1, associated with an oleic acid epoxide, apparently decreased after polymerization.”

  Bahadi 等 - 2021 - Synthesis and Characterization of Green Biodegrada DOI: 10.33263/BRIAC116.1435914371
• 913 cm⁻¹ tillid 1,0

  “The FTIR of cured epoxy shows ring opening by the disappearance of oxirane ring peak at 913 whereas X-ray diffraction shows its amorphous phase in the cured state.”

  Influence of amine‐terminated additives on thermal and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured epoxy DOI: 10.1002/app.48404
• 1738 cm⁻¹ tillid 1,0

  “Appearance of new peak at 1738 corresponding to carbonyl ester stretch indicates possible esterification reaction of carboxylic anion with highly strained epoxy ring leading to ionized epoxide (shown in Fig.”

  Mechanism and Kinetics of Curing of Diglycidyl Ether of Bisphenol A (DGEBA) Resin by Chitosan DOI: 10.1002/pen.24463
• 916 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Barbadillo 等 - 2003 - Study of a curing reaction of an epoxy resin DOI: 10.4028/www.scientific.net/MSF.426-432.2163
• 1300 cm⁻¹ tillid 1,0

  “The cm(cid:3)1intheC-matandcomposite lackofamajorpeakaround1300 indicatesthat the DWNTstarted with few defects and the curingof the epoxy did not damage them.”

  Probing deformation of double-walled carbon nanotube (DWNT)/epoxy composites using FTIR and Raman techniques DOI: 10.1016/j.compscitech.2010.04.025
• 875 cm⁻¹ tillid 1,0

  “cm-1 The existence of the epoxide ring in the purified ENR-25 is shown by peak at 875 due to half ring stretching of the epoxide while the full ring stretching is at 1234 cm-1 [9].”

  Dahham 等 - 2018 - The Influences of Zirconium Dioxide on ENR-25ZrO2 DOI: 10.1088/1742-6596/1019/1/012055
• 1717 cm⁻¹ tillid 1,0

  “The peak at 1486 cm-1 of ODA belongs to the C-H bend, and it moves to 1464 cm-1 in cm-1 cm-1 The bands at 1717 and 1060 corresponding to carboxyl and epoxide were weakened functionalized GO.”

  Daud 等 - 2017 - Functionalizing Graphene Oxide with Alkylamine by DOI: 10.3390/nano7060135