Preparation and properties of flame retardant biobased polyamide elastomer with shape memory

Abstract

Nylon is the general name of high molecular polymers with amide bonds repeat structure in the main chain. Because of its good wear resistance, excellent chemical resistance and outstanding impact resistance, it is widely used in various fields of national life, such as automobile parts, oil pipelines, electronic parts, gears, connectors, coating materials and medical applications. Using isocyanate terminated polyamide prepolymer as hard segment, polypropylene glycol as soft segment and triethanolamine as crosslinking agent, polyamide elastomer was flame retardant modified by adding reactive P flame retardant and P/N synergistic flame retardant mechanism. The sample was named IAHDP‐x, in which IAHD is the synthetic hexamethylene diamine polyaitaconic acid, and x is the mass of the added flame retardant DDP. Its tensile properties, fatigue resistance, self‐recovery and tear resistance were investigated. The results revealed that the synthesized phosphorus flame retardant (9,10‐dihydro‐9‐oxa‐10‐[N,N‐bis‐(2‐hydroxyethylamino methylene)]‐10‐phenanthroline‐10‐oxide (DDP)) could not only enhance the flame retardancy, but also strengthen the mechanical properties of polyamide. Among them, the LOI and UL‐94 of IAHDP‐1.2 were 27.6% and V‐0, respectively, indicating that it could be used as flame retardant material; Cyclic tensile test demonstrated that it had good fatigue resistance and self‐recovery; Besides, the tear resistance of IAHDP‐1.2 could reach 35.24 kJ/m2. Interestingly, IAHDP‐1.2 also displayed shape memory characteristics, and the sample could be restored to its original state at 60°C. The synthetic IAHDP‐x also had excellent flame retardancy, high mechanical properties, fatigue resistance, tear resistance, shape memory, so the material can be used in satellite wings, solar panels, electronic and electrical equipment, and smart materials.

Biobased Thermoplastic Polyamide Elastomers: Preparation, Properties, and Applications

“…Synthesis and properties of IAHDP: (a, b) The synthesis of BTPAE, (c) the tensile property of BTPAE, and (d) the flame-retardant mechanism. [Reprinted with permission from ref . Copyright 2023, Wiley.…”

“…Gao et al prepared a class of BTPAEs with flame-retardant functions. The specific synthesis is shown in Figures a and b, and the obtained material is named IAHDP- x {where x denotes the content of (9,10-dihydro9-oxa-10-[ N , N -bis­(2-hydroxyethylamino methylene)]-10-phenanthroline-10-oxide) (DDP) in the polymer}.…”

Changes in the Bacterial Communities of Biocomposites with Different Flame Retardants

“…Furthermore, under dicyandiamide catalysis, the phosphonic acid group forms phosphonic anhydride, which then reacts with hydroxyl groups on the cellulose molecule to generate numerous P-O-C covalent bonds by directly grafting onto the cellulose fiber to produce phosphate cellulose, imparting efficient flame retardancy and durability [18]. Triethanolamine is used in the production of flame retardants as a crosslinking agent [19]. It is also reported that mono-, di-, and triethanolamine inhibit the growth of a variety of microorganisms [20,21].…”