trimethylolpropane. When the pendant group of CPM was changed into 2-hydroxyethyl, hyperbranched polyphosphate (HPHEP) was obtained first through the self-condensing ring-opening polymerization (SCROP) of such CPM, and then the terminal hydroxyls of HPHEP further initiated the ROP of CPM with ethyl to produce hyperbranched multiarm copolyphosphate (HPHEP-star-PEP). The resulting copolyphosphates were characterized
据报道,一种方便的方法可通过调节开环聚合(ROP)中环状
磷酸酯单体(CPM)的侧基来控制共聚
磷酸酯的拓扑结构,包括线性嵌段,星形嵌段和超支化多臂结构。线性嵌段共聚
磷酸酯(PEP- b- P
IPP)是通过具有不同助剂基团的CPM的两步ROP程序制备的,即单官能炔
丙醇首先用乙基引发CPM的ROP,然后依次用异丙基引发CPM。同样,星型嵌段共聚
磷酸盐(
SPEP- b当单官能炔
丙醇被三官能
三羟甲基丙烷代替时,也合成了-P
IPP)。当CPM的侧基变为2-羟乙基时,首先通过该CPM的自缩合开环聚合(SCROP)得到超支化的聚
磷酸盐(HPHEP),然后HPHEP的末端羟基进一步引发CPM的ROP。与乙基生成超支化多臂共聚
磷酸酯(HPHEP- star-PEP)。所得共聚
磷酸盐通过NMR,
GPC,FTIR和
DSC技术进行了详细表征,结果证实了它们的拓扑结构。此外,
甲基四唑鎓测定法和AO / EB双重染色方