Linseed oil polyol/ZnO bionanocomposite towards mechanically robust, thermally stable, hydrophobic coatings: a novel synergistic approach utilising a sustainable resource

Abstract

Linseed oil polyol/ZnO bionanocomposite was prepared to obtain mechanically robust, thermally stable, hydrophobic coatings via a novel synergistic approach utilising a vegetable oil polyol for the first time.The synthesis process obviates the use of reducing agents, surfactants, reaction media, stabilizing agents, solvents, and other chemicals. Linseed polyol serves the purpose of obtaining ZnO nanoparticles. The linseed polyol backbone hosts hydroxyl and carboxylic groups that participate in the generation of ZnO nanoparticles in the polyol matrix (ester elimination, addition-elimination reaction). The progress of the reaction was monitored by recording FTIR spectra at regular intervals of time. The coatings obtained were scratch-resistant, impact-resistant, well-adherent, flexibility-retentive and hydrophobic, showing good chemical resistance under acidic, alkaline, and salt environments. Thermogravimetric analysis revealed that these coatings could be safely used up to 250 C. The work described is consistent with the principles of "Green Chemistry" (Principles 1, 2, 3 , 4, 5, 6, 7, 8, and 12), such as utilising a renewable feedstock, resorting to a solventless approach, and employing safer chemistry. The results showed that these coatings may be well employed as promising candidates towards environmentally friendly corrosion protective coatings. Scheme 2 The synthesis of LPP. 47936 | RSC Adv., 2015, 5, 47928-47944 This journal is

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

“…6 Functionalization of plant oils by epoxidation, transesterification, ozonolysis, and radical additions for the use in PU synthesis has been reported in various researches. [6][7][8][9][10][11][12][13][14][15][16][17] Thiol-ene click chemistry is a facile and efficient method for the synthesis of multifunctional materials. [18][19][20][21] Due to its simple reaction conditions, stereoselectivity, high rate and high yield, thiol-ene reactions have attracted the attention of many researches for the utilization of plant oils as feedstock for biopolymers.…”

“…To utilize plant oils without any inherent functional group, hydroxyl functional groups need to be introduced to its unsaturated reactive sites . Functionalization of plant oils by epoxidation, transesterification, ozonolysis, and radical additions for the use in PU synthesis has been reported in various researches …”

Nonedible Vegetable Oil-Based Polyols in Anticorrosive and Antimicrobial Polyurethane Coatings

“…LO is one of the most popular NEVOs to be used in polymer field. Reports have been published on the development of different types of polyols from LO and their applications in polyester/PU coatings [ 38 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ].…”

Preparation of PANI–CuZnO ternary nanocomposite and investigation of its effects on polyurethane coatings antibacterial, antistatic, and mechanical properties

“…The results of investigating the scratch resistance of the prepared polyurethane coatings revealed that increased content of ternary nanocomposite would lead to improved scratch resistance of the coatings. This improvement results from the interactions between ZnO nanoparticle and polyurethane chains which compact the polyurethane chains and increase their resistance against tearing [32].…”