Graft copolymer of sodium carboxymethyl cellulose and polyether polyol (CMC-g-TMN-450) improves the crosslinking degree of polyurethane for coated fertilizers with enhanced controlled release characteristics was written by Wang, Yang;Sun, Mingxue;Qiao, Dan;Li, Juan;Wang, Yajing;Liu, Weiyi;Bunt, Craig;Liu, Hongxia;Liu, Jinlong;Yang, Xiangdong. And the article was included in Carbohydrate Polymers in 2021.Quality Control of Ethyl 3-ethoxypropanoate The following contents are mentioned in the article:
Novel superhydrophobic sodium CM-cellulose (CMC) modified polyurethane (MPU) was developed as the membrane material for controlled-release fertilizer (CRF) by crosslinking polymerization of 4,4′-diphenylmethane diisocyanate (MDI) and CMC-based modified polyol (CMP) which was made by grafting CMC onto polyether polyol (TMN-450). The modified polyurethane coated fertilizer (MPUCF) was prepared by using MPU as the membrane material through a fluidized bed device. Anal. results of 13C NMR showed that the coatings of PUCF and MPUCF were prepared by connecting hydroxyl to isocyanate groups to form a carbamate. MPU had lower water absorption rates than PU, and MPUCF coating showed excellent hydrophobicity. Scanning electron microscope (SEM) revealed that MPUCF coating surface was much more smooth and flat than that of PUCF. Furthermore, the nitrogen (N) release longevity of MPUCF can increased to 140 days when the coating rate was 5%. It is concluded that MPU was an excellent superhydrophobic coating material for CRF. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Quality Control of Ethyl 3-ethoxypropanoate).
Ethyl 3-ethoxypropanoate (cas: 763-69-9) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Ethyl 3-ethoxypropanoate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics