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The degradation of the advanced polymeric materials: blends of polylactide with poly[(R,S)-3-hydroxybutyrate] was studied in paraffin (an ingredient used in cosmetics) and compared with the degradation of pure poly[(R,S)-3-hydroxybutyrate]. The interaction between the polymeric materials studied and the paraffin was monitored during the degradation experiments, and the effects of this interaction were reported. Gel permeation chromatography, atomic force microscopy, electrospray mass spectrometry, nuclear magnetic resonance, differential scanning calorimetry and thermal gravimetric analysis revealed that degradation of the investigated materials occurs in the presence of paraffin. In the blends, poly[(R,S)-3-hydroxybutyrate] content was found to extend the disintegration time, and for the blends with good miscibility, reduced the degradation rate in the first step of degradation.

The main aim of the present study was to determine the behavior of the specimens from\ud Ecovio, in the form of dumbbell-shaped samples and films, during degradation in selected cosmetic\ud ingredients such as water and paraffin. The (bio)degradation test of the prototype cosmetic package\ud (sachet) made from a PBAT (poly[(1,4-butylene adipate)-co-(1,4-butylene terephthalate)]) and PLA\ud (polylactide) blend was investigated under industrial composting conditions, and compared with\ud the sample behavior during incubation in cosmetic media at 70 °C. During the degradation tests,\ud the changes of the samples were evaluated using optical microscopy, 1H NMR (proton nuclear\ud magnetic resonance) and GPC (gel permeation chromatography) techniques. The structures of the\ud degradation products were investigated using ESI-MSn (mass spectrometry with electrospray\ud ionization on positive and negative ions) analysis. The thermal properties of selected materials were\ud determined by DSC (differential scanning calorimetry) and TGA (thermogravimetric analysis)\ud analysis. It was concluded that the PBAT and PLA blend studied had a good stability during aging\ud in cosmetic media, and could be recommended for long-shelf-life compostable packaging of\ud cosmetics, especially with oily ingredients