Hydrolyzed collagen (HC) has been extensively explored in the food sector because of its functional properties and broad availability as a low-cost byproduct. However, its widespread use as a component of edible films lacks detailed information. In this study, sodium alginate/hydrolyzed collagen (SA/HC) films with distinct loadings of HC (10, 20, and 30%) were prepared. FT-IR results suggested the formation of intermolecular chemical bonds between SA and HC. When the control sample was compared with the highest concentration of HC evaluated, it was confirmed that incorporating HC increased the maximum degradation rate temperature from 226.51 to 232.89 °C (second thermal event). The thickness of all the SA/HC films increased as a function of the HC load, and a reduction of the water vapor transmission rate (WVTR) from 1215.7 ± 71.0 to 592.4 ± 52.2 g m −2 day −1 was observed. Although SEM images showed the addition of hydrolyzed collagen led to a discontinuity in the film polymeric matrix, there was no statistically significant influence on the tensile strength. However, the elongation at break experienced a significant reduction (from 11.1 ± 7.4 to 4.0 ± 2.4%), by comparing the control sample and a 30% HC loading. In general, SA/HC films with a 10% HC loading resulted in a superior general performance, so this formulation is recommended for future food packaging studies.
Reversible deactivation radical polymerization (RDRP) is a class of powerful techniques capable of synthesizing polymers with a well‐defined structure, properties, and functionalities. Among the available RDRPs, ATRP is the most investigated. However, the necessity of a metal catalyst represents a drawback and limits its use for some applications. O‐ATRP emerged as an alternative to traditional ATRP that uses organic compounds that catalyze polymerization under light irradiation instead of metal. The friendly nature and the robustness of O‐ATRP allow its use in the synthesis of tailorable advanced materials with unique properties. In this review, the fundamental aspects of the reductive and oxidative quenching mechanism of O‐ATRP are provided, as well as insights into each component and its role in the reaction. Besides, the breakthrough recent studies that applied O‐ATRP for the synthesis of functional materials are presented, which illustrate the significant potential and impact of this technique across diverse fields.
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