Inspired from human skin, micro- and nano-wrinkled wood surface with skin-tactile performance was designed and developed using a waterborne UV-curable polyurethane acrylate coating and cellulose nofibers (CNF). To further improve the properties, the CNF was diacetylated to D-CNF and further grafted with a hyperbranched polymer containing rich end amino groups (HB-CNF). The surface structure and chemical reactions were characterized, and the skin-tactile performance of the coating was comprehensively investigated. The HB-CNF exhibited excellent dispersion in the coating, and extensive reactions occurred between the two through the –NH and terminal –NCO groups, resulting in much improved mechanical properties and durability. Micro-wrinkles with a width of approximately 12–15 μm and a height of 8–14 μm were created, and nano-protrusions of wrinkles ranging from to 50–100 nm were obtained. The coated surface was hydrophobic and exhibited high resilience after compression, with a gloss of 3.3 GU at an incident angle of 60° and a static friction coefficient of 0.26, both of which were similar to those of human skin. The results presented an effective strategy for high-performance wood products with a good feeling, which is helpful to improve the market competitiveness and meet the people's pursuit of a better life.

中文翻译：

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通过超支化聚合物接枝纤维素纳米纤维增强涂层对微纳米皱纹木材表面进行仿生设计，以提高皮肤触觉性能

受人类皮肤的启发，采用水性紫外线固化聚氨酯丙烯酸酯涂层和无纤维纤维素 (CNF) 设计和开发了具有皮肤触觉性能的微米和纳米皱纹木材表面。为了进一步改善性能，将CNF二乙酰化为D-CNF，并进一步接枝含有丰富末端氨基的超支化聚合物（HB-CNF）。对表面结构和化学反应进行了表征，并对涂层的皮肤触感性能进行了综合研究。 HB-CNF在涂层中表现出优异的分散性，两者之间通过-NH和末端-NCO基团发生广泛的反应，从而大大提高了机械性能和耐久性。产生了宽度约为12-15微米、高度为8-14微米的微皱纹，并获得了50-100纳米的皱纹纳米突起。涂层表面具有疏水性，压缩后表现出高回弹性，在60°入射角下的光泽度为3.3 GU，静摩擦系数为0.26，两者与人体皮肤相似。研究结果为高性能、好感木制品提出了有效策略，有助于提高市场竞争力，满足人们对美好生活的追求。