聚酯纤维
材料科学
有机化学
化学
高分子化学
高分子科学
化学工程
工程类
作者
Elena Buratti,Doriana Scittarelli,Lindomar Alberto Lerin,Andrea Odoardo,Alexandre Diório,Matteo Calosi,Filippo Petri,A. Montanari,Andrea Balbo,Monica Bertoldo
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2024-04-19
标识
DOI:10.1021/acssuschemeng.3c06052
摘要
Cutin from tomato byproducts is used to synthesize poly(ester-urethane) (PEU) coatings by a two-step reaction. In the first step, polyester polyols (POLs) are prepared by esterification with 1,4-butanediol (BDO) of the ω-hydroxy acid mixture from cutin (HC). A design of experiment (DOE) approach is used to optimize this reaction step. HC and POLs are characterized by 1H, 13C NMR, attenuated total reflection (ATR) infrared spectroscopies, acid–base titration, titration of the hydroxyl groups, and size-exclusion chromatography (SEC). Two different POLs obtained with 1:1 or 1:3 BDO/HC weight ratio are then used to prepare PEU coatings by reaction with isophorone diisocyanate (IPDI) or hexamethylene diisocyanate (HDI). The four resulting PEUs are characterized by ATR, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) and tested on paper, glass, and wood substrates. With IPDI the formation of amorphous coatings with smooth surfaces by scanning electron microscopy (SEM) is observed. On the contrary, HDI gives semicrystalline coatings having rough surfaces and water contact angles larger than 100°. All prepared PEUs show good hydrophobicity on all tested substrates, with the lowest (∼72°) contact angle values observed on polyurethane prepared with IPDI. Adhesion by the Scotch test was very good on paper, worst on glass, and intermediate on wood, thus showing these coatings suitable for cellulose-based substrates.
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