• Top library match: Poly(ethylene glycol methyl ether) #74696

• All reported library similarities are 0.000, S-O the nearest library name should not be treated as a reliable exact match.
• The 1728 cm-1 carbonyl band is not well explained by a simple poly(ethylene glycol methyl ether) assignment and may indicate an ester, oxidation product, additive, or mixture component.
• Peaks at 848 and 947 cm-1 are not by themselves specific enough to confirm the top candidate structure.
• The sample may be a pure polyether/glycol ether, a functionalized polyether, or a mixture containing an oxygenated aliphatic ether component plus a carbonyl-containing component.
• Because direct literature support is unavailable, the current result cannot securely distinguish between Poly(ethylene glycol methyl ether), related polyethylene oxide/glycol ethers, or another oxygenated aliphatic material with similar C-O bands.
• The present evidence does not establish molecular weight, end-group identity, or whether the sample is polymeric versus a lower-mass glycol ether.

Recommended next steps: Reacquire the FTIR spectrum with improved signal quality and confirm whether the 1728 cm-1 band is reproducible and intrinsic to the sample. Inspect the 1000-1150 cm-1 region at higher quality, since the shape and multiplicity there can help separate simple glycol ethers from polyethylene oxide/polyethylene glycol-type polymers. Check for complementary evidence by GC-MS or LC-MS if the material may be a small glycol ether, or by NMR/GPC if a polyether polymer is suspected. If the sample is a formulated product, evaluate whether the carbonyl band could arise from an ester-containing additive, plasticizer, or oxidation impurity rather than the main matrix.