Lu Chunliang, Urban Marek W
Department of Materials Science and Engineering, Center for Optical Materials and Engineering Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0915, United States.
ACS Macro Lett. 2015 Dec 15;4(12):1317-1320. doi: 10.1021/acsmacrolett.5b00745. Epub 2015 Nov 11.
Ultrahigh molecular weight (>10 g/mol) amphiphilic block copolymers were synthesized using one-step surfactant-free heterogeneous radical polymerization (SFHRP). The polymerization initially involves formation of water-soluble homopolymer blocks, followed by copolymerization of a hydrophobic monomer, resulting in ultrahigh molecular weight block copolymers. Facilitating heterogeneous reaction conditions and continuous supply of an initiator controls the process. Using this synthetic approach, we synthesized amphiphilic block copolymers of poly(2-(,-dimethylamino)ethyl methacrylate)--poly(-butyl acrylate) (pDMAEMA--pnBA), pDMAEMA--p(-butyl acrylate) (pDMAEMA--tBA), and pDMAEMA--polystyrene (pDMAEMA--pSt) with molecular weights of 1.98 × 10, 1.18 × 10, and 0.91 × 10 g/mol, respectively. These ultrahigh molecular weight block copolymers can self-assemble in nonpolar solvents to form thermochromic inverse polymeric micelles as well as other shapes and exhibit many potential applications.
使用一步无表面活性剂非均相自由基聚合（SFHRP）合成了超高分子量（>10 g/mol）两亲性嵌段共聚物。聚合反应最初涉及水溶性均聚物嵌段的形成，随后是疏水性单体的共聚反应，从而生成超高分子量嵌段共聚物。促进非均相反应条件和引发剂的持续供应可控制该过程。采用这种合成方法，我们合成了聚（甲基丙烯酸2-（N，N-二甲基氨基）乙酯）-聚（丙烯酸正丁酯）（pDMAEMA-pnBA）、聚（甲基丙烯酸2-（N，N-二甲基氨基）乙酯）-聚（丙烯酸叔丁酯）（pDMAEMA-p-tBA）和聚（甲基丙烯酸2-（N，N-二甲基氨基）乙酯）-聚苯乙烯（pDMAEMA-pSt）的两亲性嵌段共聚物，其分子量分别为1.98×10、1.18×10和0.91×10 g/mol。这些超高分子量嵌段共聚物可在非极性溶剂中自组装形成热致变色反相聚合物胶束以及其他形状，并展现出许多潜在应用。
