Biobased Symmetrical Fatty Amides for High Heat Deflection Temperature of Poly(l-lactide)-Based Materials AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c01505

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In this paper, we report the synthesis and the use of fatty bis-amides as nucleating agents for poly(l-lactide) (PLLA) to enhance its crystallization kinetics and its heat deflection temperature using short processing times. Bis-amides were synthesized in bulk from C18 fatty acid derivatives such as stearic acid, 12-hydroxystearic acid, oleic acid, or ricinoleic acid and a series of linear aliphatic diamines (C4, C6, C10, and C12) using a thermal process. The bis-amides were then mixed with neat PLLA through an extrusion process at different loadings (0.1, 0.5, 0.8, and 1 wt %) and the resulting materials were obtained by injection-molding. High degrees of crystallinity (>50%) could be achieved through short isothermal crystallization times such as 25 s at 110 °C and led to improved measured heat deflection temperatures nearing 120 °C in the best-case scenario. Such performance was achieved using the bis-amide obtained from the C4 diamine and stearic acid, which displayed the highest melting point of all the considered nucleating agents.