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利用负离子和可逆加成-断裂链转移(RAFT)聚合之间的机理转换,通过顺序加料制备了含有聚异戊二烯(PI)、聚苯乙烯(PS)和聚N-异丙基丙烯酰胺(PNIPAM)的ABC、ACB以及BAC序列的三嵌段共聚物.机理转换系通过将负离子聚合产物活性端基与二硫化碳和卤代烃反应,将其转化成双硫酯基团,并作为大分子RAFT试剂,调控第二或第三嵌段的合成.通过调节不同单体的聚合顺序,制备了用同种聚合方法难以制备的、嵌段序列可控的三嵌段共聚物.用体积排除色谱(SEC)和核磁共振谱(NMR)等对产物进行了表征.
By means of the mechanism conversion between negative ions and reversible addition-fragmentation chain transfer (RAFT) polymerization, polyisoprene (PI), polystyrene (PS) and poly-N-isopropylacrylamide (PNIPAM), a triblock copolymer of ABC, ACB and BAC sequences.The mechanism conversion system converts a living end group of an anionic polymerization product to carbon disulfide and a halogenated hydrocarbon, converts it to a dithioester group, and acts as a macromolecule RAFT reagent to control the synthesis of the second or the third block.Through adjusting the polymerization sequence of different monomers, a triblock copolymer with block sequence control that is difficult to prepare by the same polymerization method was prepared, (SEC) and nuclear magnetic resonance (NMR) were used to characterize the product.