Production and characterization of biodegradable bi-layer films from poly(lactic) acid and zein

Parlak, Mahmud Ekrem; Uzuner, Kubra; Kirac, Fatma Tuba; Ozdemir, Sebahat; Dundar, Ayse Neslihan; Şahin, Oya Irmak; Dağdelen, Adnan Fatih; Sarıcaoğlu, Furkan Türker

doi:10.1016/j.ijbiomac.2022.11.278

Cited by 21 publications

(10 citation statements)

References 37 publications

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“…Bi-layer film production was carried out based on our previous studies with minor modifications. 16 For his purpose, PLA film-forming solution, as the first layer, was prepared by dissolving PLA pellets (5 g) in chloroform (95 mL) in a closed bottle on a magnetic stirrer for 6 h. Then, PLA solutions at various volumes were poured into glass Petri dishes at 10 cm diameter. The Petri dishes were held overnight in a fume hood at 25 C to evaporate the solvent.…”

Section: Production Of Bi-layer Filmsmentioning

confidence: 99%

“…If the WCA of a packaging film surface is higher than 90 , this film is defined as hydrophobic, and vice versa, this film is called hydrophilic. 16,37 The WCA of PLA/TPS bi-layer films were obtained from the TPS (up) and PLA (down) surfaces and the results are depicted in Figure 5. The neat PLA film displayed the highest WCA result, whereas the neat TPS film showed the lowest value, and this could be attributed to the hydrophobic character of PLA films.…”

Section: Water Contact Anglementioning

confidence: 99%

“…These typical transition temperatures of PLA films obtained from the DSC thermogram were also consistent with our previous bi-layer film research. 15,16 The production of PLA/TPS bi-layer films caused changes in the transition temperatures of neat films. At low TPS ratios, the characteristic peaks of PLA were observed, as well as T m of TPS film.…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…However, good compatibility between film layers has been observed in our previous studies where we focused on the production of Zein-PLA and gelatin-beeswax emulsion-PLA bi-layer films. 15,16…”

Section: Microstructural Propertiesmentioning

confidence: 99%

“…14 In our previous studies, bi-layer films were produced using PLA-Zein and PLA-gelatin beeswax emulsion, and the oxygen permeability (OP) of bi-layer films dramatically decreased when compared with neat PLA films. 15,16 Multilayered films produced from TPS and PLA provided 1300% improvement in moisture barrier properties of TPS films, and 3300% improvement in oxygen barrier properties of PLA films. 11 To the best of our knowledge, there are no studies focusing on the production of PLA/TPS bi-layer films at various ratios, and we aim to explore the effects of PLA/TPS ratios on the films' properties, including mechanical strength, flexibility, thermal stability, moisture resistance, and gas barrier properties, as well as microstructure and hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of biodegradable bi‐layer films from thermoplastic starch and poly‐l‐lactic acid

Parlak,

Uzuner,

Ozdemir

et al. 2024

J of Applied Polymer Sci

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This study aimed to enhance the oxygen barrier properties of polylactic acid (PLA) film, a biodegradable packaging material with high oxygen permeability (OP). Bi‐layer films were produced by coating thermoplastic starch (TPS) onto PLA films in various ratios while maintaining constant film thickness. The mechanical, optical, barrier, thermal, hydrophobicity, moisture sorption, and microstructural properties of the films were analyzed. Increasing the TPS ratio elevated moisture content (MC), water uptake, solubility, and opacity while enhancing UV barrier properties. TPS coating reduced tensile and burst strength but increased the burst deformation of the bi‐layer films. Bi‐layer film production resulted in a water vapor permeability increase of 59.26%–94.44% compared with neat PLA while decreasing OP by 2.52%–29.66%. The equilibrium moisture content (EMC) rose with higher TPS ratios, displaying type II isotherms. FTIR analysis indicated no chemical interactions between PLA and TPS. Increasing the TPS ratio decreased PLA crystallinity, supporting the mechanical and barrier properties of the bi‐layer films. Neat and bi‐layer films exhibited smooth, homogeneous surfaces, with a visible interface in the cross‐section of the bi‐layer films. In conclusion, TPS shows promise as an alternative to improve oxygen barrier properties in PLA films without adversely affecting other properties.

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Section: Production Of Bi-layer Filmsmentioning

confidence: 99%

Section: Water Contact Anglementioning

confidence: 99%

Section: Thermal Propertiesmentioning

confidence: 99%

Section: Microstructural Propertiesmentioning

confidence: 99%