A bio-based and non-toxic polyurethane film derived from Luffa cylindrica cellulose and ʟ-Lysine diisocyanate ethyl ester

Preparation and performance study of a reactive polyurethane hot-melt adhesive/CS–Fe3O4 magnetic nanocomposite film/fabric

“…This resulted in physical cross-linking between the polyurethane chains, which led to weight stability from 580 to 1000 °C, with 10.2% fixed residue. 39 Finally, in Fig. 3(d) the DCS plot shows a glass transition temperature of 300–600 °C for PUR, 40 while the observed heat absorption range of the 0.3% CS–Fe 3 O 4 magnetic nanocomposite is in the range of 300–600 °C, proving that the samples began to react with air.…”

Toward mechanically robust self-healing polyurethanes using dynamics chemistry

“…Using l -lysine diisocyanate (LDI) as a hard segment to replace the commonly used aromatic diisocyanate has more advantages: on the one hand, its breakdown product lysine is a basic amino acid in the human body, and on the other hand, the degradation product does not affect the pH value of tissue fluid and cause inflammation. 135,136 Degradable PU materials, which have received much attention in recent years due to their environmentally friendly characteristics and their need in the industry to develop new materials for medical purposes, can be achieved by adding unstable and hydrolyzable portions to polymers. 137–139 The ester group, carbamate group, and urea group in the PU chain are in contact with water, which makes it easy for the PU chain to hydrolyse and leads to molecular chain fracture, and the degradation products are mainly alcohol carboxylic acid and ester.…”

Synthesis of a fully bio-based self-catalyzed hyperbranched waterborne polyurethane as a sizing agent for enhancing the interfacial properties of CF/PA6 composites

“…A primary hindrance to advancing this field is the necessity of using phosgene gas to produce isocyanate molecules. 38,[40][41][42] In this study, a catalyst-free hyperbranched waterborne polyurethane (HWPU) was synthesized by replacing the conventional catalyst with a catalytic polyol derived from the ringopening reaction of epoxidized soybean oil (ESBO) with diethylamine. Simultaneously, we employed L-lysine diisocyanate (LDI), a biodegradable bio-based diisocyanate, renowned for its ability to prevent the formation of toxic and carcinogenic aromatic diamine by-products.…”

“…A primary hindrance to advancing this field is the necessity of using phosgene gas to produce isocyanate molecules. 38,40–42…”