How can you identify PLLA from FTIR?
This page summarizes the recurring FTIR evidence reported for PLLA, including the most frequent peaks, supporting functional groups, and literature-backed interpretation patterns. It is a structured evidence page, not a claim of automatic single-spectrum certainty.
Backed by 12 cited sources
Quick answer
PLLA is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.
Peak interpretation
Possible materials / groups
| Funktionel gruppe | Bevis |
|---|---|
| Alkyl C-H | 8 |
| C-O single bond | 6 |
| Methoxy (OCH3) | 5 |
| Methacrylate | 5 |
| Acetate | 5 |
| Water (H2O) | 4 |
| Methyl | 2 |
| Amide | 2 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of PLLA, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.
Real-world usage
This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.
Common mistakes
- Calling a material match too early because one famous peak is present.
- Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
- Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.
Verification advice
Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.
Literature behind this page
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PLLA
Nguyen Thai Cuong 等 - 2020 - On the Nanoscale Mapping of the Mechanical and Pie DOI: 10.3390/app10020652 -
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PLLA
Effect of processing conditions on the development of morphological features of banded or nonbanded spherulites of poly(3hydroxybutyrate) (PHB) and polylactic acid (PLLA) blends DOI: 10.1002/pen.21991 -
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Leroy 等 - 2017 - FTIR microscopy contribution for comprehension of DOI: 10.1007/s10856 -
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PLLA
Li 等 - 2020 - Effect of molecular weight of polyethylene glycol DOI: 10.1039/d0ra08699a -
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Pannico 和 La Manna - 2019 - Sorption of Water Vapor in Poly(L-Lactic Acid) A DOI: 10.3389/fchem.2019.00275 -
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Temperature-Dependent Polymorphism and Phase Transformation of Friction Transferred PLLA Thin Films DOI: 10.3390/polym14235300 -
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PLLA
Time series Fourier transform infrared spectroscopy for characterization of water vapor sorption in hydrophilic and hydrophobic polymeric films DOI: 10.1016/j.saa.2020.119371 -
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PLLA
El-Hadi - 2019 - Miscibility of CrystallineAmorphousCrystalline B DOI: 10.1080/03602559.2018.1455863 -
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PLLA
Xue Li 等 - 2015 - Precise Structural Regulation of Poly(L-lactide) A DOI: 10.7503/cjcu20150231 -
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Crystallization behavior of poly(L?lactic acid)/montmorillonite nanocomposites DOI: 10.1002/app.31966
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