This paper reports an environment-friendly biobased foam made with cellulose nanofiber (CNF) and a biobased hyperbranched crosslinker, glycerol succinic anhydride (GSA). As a biobased hyperbranched crosslinker, carboxyl-terminated GSA is synthesized through a straightforward esterification process involving glycerol and succinic anhydride. The GSA-crosslinked CNF (GSA/CNF) foam is prepared using a facile, sustainable, cost-effective, and efficient solvent-exchange method. The resulting foam exhibits notable characteristics, including improved dimensional stability, remarkably low density (13.41 mg/cm) with high porosity (>99 %), and exceptional compressive strength (494 kPa) and modulus (452 kPa). Further, the foam offers outstanding sound absorption capabilities with a coefficient of 0.986 at 2 kHz and remarkably low thermal conductivity (30.18 mW/mK), significantly lower than commonly used and reported porous materials, indicating its potential as an efficient, environmentally friendly sound absorption and thermal insulation material.

中文翻译：

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使用生物来源的超支化交联剂制成的坚固、高孔隙度和可持续的纳米纤维素泡沫，用于隔热和吸音

本文报道了一种由纤维素纳米纤维（CNF）和生物基超支化交联剂甘油琥珀酸酐（GSA）制成的环保生物基泡沫。作为一种生物基超支化交联剂，羧基封端的 GSA 通过甘油和琥珀酸酐的简单酯化过程合成。 GSA 交联 CNF (GSA/CNF) 泡沫采用简便、可持续、经济高效的溶剂交换方法制备。所得泡沫具有显着的特性，包括改进的尺寸稳定性、极低的密度 (13.41 mg/cm) 和高孔隙率 (>99%)，以及出色的压缩强度 (494 kPa) 和模量 (452 kPa)。此外，该泡沫具有出色的吸声能力，2 kHz 时的系数为 0.986，导热系数非常低（30.18 mW/mK），明显低于常用和报道的多孔材料，表明其作为高效、环保吸声材料的潜力和隔热材料。