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在20℃水溶液中,选用PMDETA/Cu(Cl)为催化剂,以2-溴代异丁酰基封端的PPO-PEO-PPO三嵌段共聚物与β-环糊精(β-CD)形成的聚准轮烷(PPR)作为引发剂引发丙烯酸羟乙酯(HEA)发生非均相ATRP反应.1H-NMR,GPC,FTIR,WXRD,DSC以及TGA测试表明,PHEA已连接到PPR两端生成了具有管道结晶结构的聚轮烷嵌段共聚物.聚轮烷中β-CD上链量以及PHEA链段聚合度能通过改变其投料摩尔比予以调控.观察到经过用水透析处理后的聚轮烷,β-CD只停留在PPO链段上.而经DMF溶解和无水乙醚沉淀后,大约有1/3的β-CD滑向中间的PEO链段上.表明该聚轮烷嵌段共聚物具有溶致响应性.
In the aqueous solution of 20 ℃, PMDETA / Cu (Cl) was chosen as the catalyst and the poly (2-bromoisobutyryl) terminated PPO-PEO-PPO triblock copolymer and β-cyclodextrin The results of 1 H-NMR, GPC, FTIR, WXRD, DSC and TGA indicated that PHEA had been connected to both ends of PPR to produce a heterophasic ATRP reaction with homocrotonic acid (PPR) The results showed that the amount of β-CD in polyrotaxane and the degree of polymerization of PHEA could be controlled by changing the feeding molar ratio of polyrotaxane, β-CD resides only on the PPO segment, whereas about 1/3 of the β-CD slip toward the middle PEO segment after DMF dissolution and anhydrous ether precipitation, indicating that the polyrotaxane block copolymer has Lyotropic response.