Synthesis of Rotaxane-Linked Star Polymers and Its Structure Transformation
Polymer topology has been recognized as a critical factor significantly influencing polymer property in bulk and in solution among the factors including composition and molecular weight.A variety of cyclic,star, dendritic, and interlocked polymers have been synthesized from this viewpoint.In the light of dynamic polymer structure control, topology-transformable polymer which can change their topology in response to a particular stimulus, is attractive in the control of polymer structure and property,development of stimuli-responsive polymers, and so on.This work deals with the introduction of rotaxane linkage into the junction point of star polymer to make structure-transformable star polymer.The rotaxane structure plays a key role as a controllable movable linking unit, which endows star polymer with additional functionality.Rotaxane-linked star polymer whose 3 arms among 6 arms are connected by mechanical linkages to the other 3 arms was synthesized by the click reaction of trifunctional nitrile N-oxide with reactive macromolecular 2rotaxane (Scheme 1).Macromolecular 2rotaxane was synthesized in one pot via living ring-opening polymerization initiatated by a sec-ammonium/crown ether-type pseudo2rotaxane that possessed two hydroxyl initiator groups on both the axle having the alken group and wheel components, followed by the end-capping reaction with a bulky isocyanate 1.The 3 arms connected with the rotaxane structure were moved from the core side to the outside by controlling the local position of the wheel component, which changed the whole polymer structure from 6 arms polymer to 3 arms star polymer.The resulting star polymers were characterized by their properties before and after the structure xstransformation.
Takuma HIROSE Daisuke AOKI Toshikazu TAKATA
Department of Chemical Science Engineering, Tokyo Institute of Tecnology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
国际会议
9th International Symposium on High-Tech Polymer Materials(第9届国际高技术高分子材料学术会议)(HTPM-9)
郑州
英文
84-84
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）