Influence of Epilobium parviflorum Herbal Extract on Physicochemical Properties of Thermoplastic Starch Films

Zdanowicz, Magdalena

doi:10.3390/polym16010064

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…Each film was measured at 6 random locations. Moreover, changes in color (∆E), yellowness index (YI) [32], and chroma (c*), were calculated according to the following equations [33]:…”

Section: Color Measurement Of the Filmsmentioning

confidence: 99%

The Influence of Functional Composite Coatings on the Properties of Polyester Films before and after Accelerated UV Aging

Mizielińska,

Zdanowicz,

Tarnowiecka-Kuca

et al. 2024

Materials

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The aim of this study was to cover biopolymeric packaging films based on PLA/PHBV blend with a functional composite coating (to retain their ecological character) and to investigate their antimicrobial properties before and after UV irradiation. As an active coating, the carrier hydroxypropyl methyl cellulose (HPMC), as well as its modified form with Achillea millefolium L., Hippophae rhamnoides L., and Hypericum L. extract (E) and a combined system based on the extracts and nano-ZnO (EZ), was used to obtain active formulations. Additionally, film surface morphology (SEM, FTIR-ATR) and color (CIELab scale) analysis of the pre- and post-UV-treatment samples were performed. The results confirmed that the E and EZ-modified films exhibited antibacterial properties, but they were not effective against phage phi6. Q-SUN irradiation led to a decrease in the activity of E coating against Staphylococcus aureus, Pseudomonas syringae, and Candida albicans. In this case, the effectiveness of EZ against C. albicans at 24 h and 72 h UV irradiation decreased. However, the irradiation boosted the antiviral effectiveness of the EZ layer. SEM micrographs of the film surface showed that UV treatment did not significantly influence the native film morphology, but it had an impact on the coated film. FTIR analysis results showed that the coatings based on HPMC altered the IR absorption of the nonpolar groups of the biopolyester material. The applied coatings only marginally affected film color changes and increased their yellowness after UV irradiation, whereas a composite layer of nano-ZnO limited these changes.

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“…Each film was measured at 6 random locations. Moreover, changes in color (∆E), yellowness index (YI) [32], and chroma (c*), were calculated according to the following equations [33]:…”

Section: Color Measurement Of the Filmsmentioning

confidence: 99%

The Influence of Functional Composite Coatings on the Properties of Polyester Films before and after Accelerated UV Aging

Mizielińska,

Zdanowicz,

Tarnowiecka-Kuca

et al. 2024

Materials

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“…For these reasons, new materials with a reduced impact on the environment have been developed. Among them, thermoplastic starch (TPS) is particularly important [3]. TPS, as opposed to dry starch, is capable of flow, and, hence, when mixed with other synthetic polymers, it can behave in a manner similar to conventional polymer blends [4].…”

Section: Introductionmentioning

confidence: 99%

Obtaining and Characterizing New Types of Materials Based on Low-Density Polyethylene and Thermoplastic Starch

Stelescu,

Oprea,

Motelica

et al. 2024

J. Compos. Sci.

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Significant interest is devoted to the development of new polymer blends by using concepts of the circular economy. Such materials have predetermined properties, are easy to recycle, ecological, and have a low carbon footprint. This research presents obtaining and characterization of polymer blends based on low-density polyethylene (LDPE) and thermoplastic starch (TPS). In the first stage, TPS was obtained through the gelatinization process, and, in the second stage, mixtures of LDPE and TPS were obtained through a melt mixing process at 150 °C for 7 min. The physical–mechanical characteristics of the samples, like hardness, elongation at break, rebound resilience, and tensile strength, were determined. The sample containing maleic anhydride grafted low-density polyethylene (LDPE-g-MA) as a compatibilizer shows improvements in elongation at break and tensile strength (by 6.59% and 40.47%, respectively) compared to the test sample. The FTIR microscopy maps show that samples containing LDPE-g-MA are more homogeneous. The SEM micrographs indicate that TPS-s is homogeneously dispersed as droplets in the LDPE matrix. From the thermal analysis, it was observed that both the degree of crystallinity and the mass loss at high temperature are influenced by the composition of the samples. The melt flow index has adequate values, indicating good processability of the samples by specific methods (such as extrusion or injection).

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Influence of Epilobium parviflorum Herbal Extract on Physicochemical Properties of Thermoplastic Starch Films

Cited by 2 publications

References 46 publications

The Influence of Functional Composite Coatings on the Properties of Polyester Films before and after Accelerated UV Aging

The Influence of Functional Composite Coatings on the Properties of Polyester Films before and after Accelerated UV Aging

Obtaining and Characterizing New Types of Materials Based on Low-Density Polyethylene and Thermoplastic Starch

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