Abstract

An efficient method for the preparation of polymer grafted gibbsite nanoplatelets (NPs) was proposed by direct preparation of initiator-tethered gibbsite (gibbsite-Br) NPs followed by surface-initiated atom transfer radical polymerization (SI-ATRP) to obtain gibbsite particle brushes. By adding portion of water-soluble solvent (e.g., alcohol), individual ATRP initiator-tethered gibbsite NPs were fabricated using 2-bromo-2-methylpropionic acid as a tetherable initiator avoiding the aggregation of gibbsite NPs which are ready for polymer grafting process. To verify the efficiency of the tethered initiator, various polymers grafted gibbsite NPs were fabricated by SI-ATRP. The results indicated that initiator anchored gibbsite NPs and various gibbsite-g-polymers (e.g., gibbsite-g-poly2-(dimethylamino) ethyl methacrylate, gibbsite-g-polyacrylonitrile, gibbsite-g-polymethyl methacrylate) were synthesized successfully. The thermal stabilities of gibbsite-g-polymer hybrid materials have been enhanced significantly. Compared with PMMA matrix, the fire-retardant behavior of gibbsite-g-polymethyl methacrylate was strengthened due to the incorporation of gibbsite NPs. This work proposed a versatile and convenient method for producing initiator-immobilized solid NPs and polymer grafts, which thereby enables promised properties of polymer hybrid materials depending on the orientation and interactions of particle brushes.

摘要

提出了一种制备聚合物接枝三水铝石纳米片 (NPs) 的有效方法，即直接制备引发剂束缚三水铝石 (三水铝石-Br) NPs，然后表面引发原子转移自由基聚合 (SI-ATRP) 以获得三水铝石颗粒刷。通过添加部分水溶性溶剂（例如，酒精），使用 2-溴-2-甲基丙酸作为可连接的引发剂制备单独的 ATRP 引发剂连接的三水铝石 NP，避免了准备用于聚合物接枝过程的三水铝石 NP 的聚集。为了验证束缚引发剂的效率，通过 SI-ATRP 制造了各种聚合物接枝的三水铝石 NP。结果表明引发剂锚定三水铝石纳米颗粒和各种三水铝石-g-聚合物（例如，三水铝石-g-聚2-（二甲基氨基）甲基丙烯酸乙酯、三水铝石-g-聚丙烯腈、成功合成了三水铝石-g-聚甲基丙烯酸甲酯）。三水铝石-g-聚合物杂化材料的热稳定性显着提高。与 PMMA 基体相比，三水铝石-g-聚甲基丙烯酸甲酯的阻燃性能由于三水铝石 NPs 的加入而增强。这项工作提出了一种通用且方便的方法来生产固定引发剂的固体纳米粒子和聚合物接枝物，从而根据粒子刷的方向和相互作用实现聚合物杂化材料的承诺性能。由于三水铝石纳米粒子的掺入，三水铝石-g-聚甲基丙烯酸甲酯的阻燃性能得到了加强。这项工作提出了一种通用且方便的方法来生产固定引发剂的固体纳米粒子和聚合物接枝物，从而根据粒子刷的方向和相互作用实现聚合物杂化材料的承诺性能。由于三水铝石纳米粒子的掺入，三水铝石-g-聚甲基丙烯酸甲酯的阻燃性能得到了加强。这项工作提出了一种通用且方便的方法来生产固定引发剂的固体纳米粒子和聚合物接枝物，从而根据粒子刷的方向和相互作用实现聚合物杂化材料的承诺性能。