SYNTHESIS AND CHARACTERIZATION OF BLOCK POLYMER OF ALTERNATING COPOLYMERS

摘要

＜正＞ Block polymer of alternating copolymers, poly[（ST-a-MA）-b（IP-a-MMA）-b-（ST-a-MA）]（I）, has been synthesized in the presence of AlEt1.5Cl1.5,by using Mn2（CO）10/CBr4. initiation system.The GPC results indicate that there is no unreacted prepolymer in I purified by precipitation andfractionation. The study of NMR shows that every block of polymer I has alternating structure. The dynamicmechanical properties of I measured by torsional braid method indicate that the polymer has two Tg s,being 38 and 75℃, respectively. The transmission electron micrographs of I show they have two phasestructure and the domain size increases with increasing molecular weight of hard block.