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Lysine‐Functionalized Gibbsite Nanoplatelet Dispersions for Nonisocyanate Polyhydroxyurethane Nanocomposites and Translucent Coatings
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-06-30 , DOI: 10.1002/mame.202000217 Burkhardt Pössel 1 , Rolf Mülhaupt 1
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-06-30 , DOI: 10.1002/mame.202000217 Burkhardt Pössel 1 , Rolf Mülhaupt 1
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The lysine functionalization of ultrathin γ‐Al(OH)3 single‐crystal nanoplatelets (ly‐gibbsite) having an average thickness below 100 nm and a width ranging between 0.5 and 1.5 µm renders them organophilic and enables their agglomerate‐free dispersion in nonisocyanate polyhydroxyurethane (NIPU) thermosets prepared by amine cure of polyfunctional cyclic carbonates. Whereas most other nanoparticles drastically increase viscosity even at very low content, NIPU processing tolerates up to 40 wt% ly‐gibbsite without impairing its uniform dispersion. The amine groups of ly‐gibbsite can react with cyclic carbonate groups of NIPU to afford interfacial coupling. Contrary to the NIPU composites containing corundum and spherical gibbsite particles, ly‐gibbsite/NIPU nanocomposites exhibit substantially higher stiffness as reflected by high Young’s modulus up to 9500 MPa. Moreover, ly‐gibbsite/NIPU coatings remain translucent even at high ly‐gibbsite content when the nanoplatelet length is below 1 µm. As verified by transmission electron microscopic imaging of coatings, the ly‐gibbsite nanoplatelets are aligned parallel to the surface. At high ly‐gibbsite content, NIPU thermosets are rendered flame retardant in the absence of halogen and other flame retardants. The NIPU coatings tolerate the addition of aluminum flakes to produce metallic NIPU varnishes.
中文翻译：
用于非异氰酸酯聚羟基氨基甲酸酯纳米复合材料和半透明涂层的赖氨酸功能化菱沸石纳米片分散体
超薄γ-Al（OH）3的赖氨酸功能化单晶纳米片（三水铝石）的平均厚度低于100 nm，宽度在0.5至1.5 µm之间，使其具有亲有机性，并使它们能够在无异氰酸酯聚羟基氨基甲酸乙酯（NIPU）热固性树脂中分散成无团聚体，该热固性物质是通过胺固化多官能环状碳酸酯制备的。尽管大多数其他纳米颗粒即使在非常低的含量下也能显着增加粘度，但NIPU加工可耐受高达40 wt％的菱铁矿，而不会损害其均匀分散性。菱沸石的胺基可与NIPU的环状碳酸酯基反应以提供界面偶联。与含有刚玉和球形三水铝石颗粒的NIPU复合材料相反，三水铝石/ NIPU纳米复合材料表现出明显更高的刚度，这体现在高达9500 MPa的高杨氏模量。此外，当纳米血小板长度小于1 µm时，即使在高三水铝石含量下，三水铝石/ NIPU涂层仍保持半透明。涂层的透射电子显微镜成像证实，菱镁矿纳米片平行于表面排列。在高三水铝石含量下，NIPU热固性塑料在没有卤素和其他阻燃剂的情况下具有阻燃性。NIPU涂料可忍受添加铝片以生产金属NIPU清漆。
更新日期：2020-08-12
中文翻译：
用于非异氰酸酯聚羟基氨基甲酸酯纳米复合材料和半透明涂层的赖氨酸功能化菱沸石纳米片分散体
超薄γ-Al（OH）3的赖氨酸功能化单晶纳米片（三水铝石）的平均厚度低于100 nm，宽度在0.5至1.5 µm之间，使其具有亲有机性，并使它们能够在无异氰酸酯聚羟基氨基甲酸乙酯（NIPU）热固性树脂中分散成无团聚体，该热固性物质是通过胺固化多官能环状碳酸酯制备的。尽管大多数其他纳米颗粒即使在非常低的含量下也能显着增加粘度，但NIPU加工可耐受高达40 wt％的菱铁矿，而不会损害其均匀分散性。菱沸石的胺基可与NIPU的环状碳酸酯基反应以提供界面偶联。与含有刚玉和球形三水铝石颗粒的NIPU复合材料相反，三水铝石/ NIPU纳米复合材料表现出明显更高的刚度，这体现在高达9500 MPa的高杨氏模量。此外，当纳米血小板长度小于1 µm时，即使在高三水铝石含量下，三水铝石/ NIPU涂层仍保持半透明。涂层的透射电子显微镜成像证实，菱镁矿纳米片平行于表面排列。在高三水铝石含量下，NIPU热固性塑料在没有卤素和其他阻燃剂的情况下具有阻燃性。NIPU涂料可忍受添加铝片以生产金属NIPU清漆。
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