Natural Phenolic Compounds as Modifiers for Epoxidized Natural Rubber/Silica Hybrids

Abstract

Silica is a popular filler, but in epoxidized natural rubber, can act as a cross-linking agent. Unfortunately, a high amount of silica is necessary to obtain satisfactory tensile strength. Moreover, a high amount of silica in ENR/silica hybrids is associated with low elongation at break. In our paper, we propose natural phenolic compounds, including quercetin, tannic acid, and gallic acid as natural and safe additional crosslinkers dedicated to ENR/silica hybrids to obtain bio-elastomers with improved mechanical properties. Therefore, toxic crosslinkers, such as peroxides or harmful accelerators can be eliminated. The impact of selected natural phenolic compounds on crosslinking effect, mechanical properties, color, and chemical structure of ENR/silica composite have been analyzed. The obtained results indicated that only 3 phr of selected natural phenolic compounds is able to improve crosslinking effect as well as mechanical properties of ENR/silica hybrids. Moreover, some of the prepared materials tend to regain mechanical properties after reprocessing. Such materials containing only natural and safe ingredients have a chance of becoming novel elastomeric biomaterials dedicated to biomedical applications.

Polylactide-Based Films Incorporated with Berberine—Physicochemical and Antibacterial Properties

“…of additive. This observation is consistent with research where a different yellow flavonoid was applied [13,27,40]. Presumably the limitation of transparency is caused by the crystallization of berberine resulting in the formation of a crystalline network in the polymeric matrix.…”

Gallic acid-loaded HFZIF-8 for tumor-targeted delivery and thermal-catalytic therapy

“…Natural plant polyphenols [1][2][3] have received wide attention in the antitumor field on account of their low burden on the human body [4][5][6] and multiple mechanisms for cancer treatment. [7][8][9] Gallic acid (GA), as one of the most common natural polyphenols, 10,11 is important in the anticancer field because of its selective cytotoxicity to various kinds of cancer cells.…”

Preparation of Hydrophobic Modified Silica with Si69 and Its Reinforcing Mechanical Properties in Natural Rubber

“…The silane coupling agent has been employed to modify the surface of nano-silica [19,20], which can effectively diminish the abundance of hydroxyl groups present on the surface and enhance its dispersion within natural rubber materials [21][22][23]. This modification significantly improves the interfacing compatibility between nano-silica and the natural rubber matrix [24][25][26].…”