Infrared and Raman studies on polylactide acid and polyethylene glycol-400 blend

Kurniawan  Yuniarto; Yohanes Aris  Purwanto; Setyo  Purwanto; Bruce A.  Welt; Hadi Karia  Purwadaria; Titi Candra  Sunarti

doi:10.1063/1.4945555

Abstract

As a biodegradableplastic, polylactideacid (PLA) can be blended with polyethylene glycol (PEG) to form a polymer blend because PEG has a good miscibility with PLA. Furthermore, this paper study the functional groups of PLA-PEG400 blend using direct casting to produce matrix film. Fourier Transform Infrared (FTIR) and Raman spectroscopy was used to identify alteration of functional group PLA-PEG400 blend. Absorbance and frequency wavenumber were used to observe any changing among functional group. In general, PLA-PEG blend did not produce a new configuration or chemical properties although some functional groups tended to decrease. PLA-PEG400 film spectra showed a similaritycompared to those of neat PLA because of each pristine polymer. However, FTIR and Raman investigated reducing carbonyl group of PLA with PEG400 addition and followed improving CH-COC bonding. Methyl group represented CH_3symmetricchanged both the shift and absorbance.FTIR and Raman spectroscopy observed increasing hydrogen bonding with increasing PEG400 addition where a largest was found at PEG 10% and appeared at frequency range from 3400 cm⁻¹ to 3600 cm⁻¹. According to PEG400 addition, a FTIR measuredenhancing crystalline region.

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