Synthesis And Properties Of Hyperbranched Polymers And Their End Of The Crown Ether Modified Derivatives

This thesis includes two parts. One is about synthesis and end group modification of hyperbranched polymer containing crown ether from an A2+B3 monomer system. The other is the binding abilities and transporting abilities of the polymers (B15C5-HP and B15C5-HP-EGM) for alkali and alkaline earth metal cations, the temperature sensitivity properties of B15C5-HP were investigated in aqueous solution. The main results obtained are as follows:1. The following hyperbranched polymer containing crown ether (B15C5-HP) was designed and synthesized via A2 + B3 approach (as shown in Scheme1). End group modified hyperbranched polymers containing crown ethers (B15C5-HP-EGM) are shown in Scheme2. These hyperbranched polymers were characterized by FT-IR, 1HNMR, GPC, and TG respectively. The polymers exhibited good solubility in common organic solvents. The Mn and PDI were measured by GPC, calibrated with polystyrene standards; experimental results showed that the Mn and PDI of the hyperbranched polymers were varied with the values of [A2]/ [B3]. B15C5-HP decompose at the temperature above 325℃,while B15C5-HP-EGM decompose above 230℃.Scheme 1 Structure of hyperbranched polymer containing crown ether...