Effect of Core Reactivity on the Molecular Weight, Polydispersity, and Degree of Branching of Hyperbranched Poly(arylene ether phosphine oxide)s
作者:David P. Bernal、Laura Bedrossian、Kelly Collins、Eric Fossum
DOI:10.1021/ma021510b
日期:2003.1.1
Synthesis of hyperbranched poly(arylene ether phosphine oxide)s, HB PAEPOs, from bis(4-fluorophenyl)(4-hydroxyphenyl)phosphine oxide, 1a, in the presence of a series of core molecules with systematically altered reactivity of the aryl fluoride groups provides polymers with molecular weights, MWs, controlled by the concentration of the core molecule, and narrow polydispersity indices, PDIs. Polymers with number-average
在一系列具有系统改变的芳基氟化物反应性的核心分子的存在下,由双(4-氟苯基)(4-羟苯基)氧化膦1a合成超支化聚(亚芳基醚氧化膦)HB PAEPO提供的聚合物分子量(MWs)受核心分子浓度控制,且多分散指数(PDI)窄。制备了数均分子量为3270至8100 Da且PDI低至1.25的聚合物。在这项工作中使用的核心分子由一系列氟化三芳基膦氧化物,三(4-氟苯基)膦氧化物,三(3,4-二氟苯基)膦氧化物和三(3,4,5-三氟苯基)膦氧化物组成,2a,2b和2c, 分别。激活程度最高的内核2c提供了对最终MW和最低PDI的最佳控制。HB PAEPO的支化度DB从无核的0.57降低到2b和2c的较高浓度下的0.40以下。