The Investigation On The Synthesis And Phase Behavior Of Polystyrene-block-Poly(n-butyl Methacrylate) Polymer

Along with rapid semiconductor industry development,the performance requirements of chip materials are also increasing.Amphiphilic block polymers that microscopic spontaneous separation to form nanoscale ordered structure is expected to become an effective technology to promote the development of next-generation photolithography.The topological structure of block polymers has a significant impact on improving the phase separation ability of polymers.Thus precise design and synthesis of proportionally controllable block polymers with clear topological structure can facilitate the study of polymer phase separation,establish theoretical basis for the study of“structure-property”relationship of block polymers.Therefore,how to effectively control the phase separation composition of block polymers is one of the core of the study of phase separation structure.Up till now,the methods of phase enhancement of block polymers are relatively simple,and there are few reports on the high resolution structure of block polymers by changing the topological.In this paper,two phase proportion design synthesis of similar composition block polymers,different topology based on living anionic polymerization,four defined polymers and alkynyl functionalized polymers were designed and prepared based on living anionic polymerization,and the introduction of specific functional monomer polymerization position in living anionic polymerization were successfully completed.Moreover an accurate and efficient method for the synthesis of block polymers with proportional controlled topology was developed via hydrosilylation.1.Based on the mechanism of living anionic polymerization,combining with the design of polymerization,four structure-defined polymers with similar molecular weight but different number and position of Si H functional groups,two structure-defined polymers with different molecular weight but similar position of alkynyl functional groups were synthesised.The polymeric include functional polystyrene with hydrosilylation at the terminal and in the chain,and alkynyl-functionalized poly(n-buty methacrylate)at the end.In addition,~1H-NMR and SEC were combined to study the polymers structures and molecular weight,and the synthesis of polymeric and the precise control of polymeric structure were successfully realized in the polymerization process.2.Four kinds of Si H-functionalized polystyrene and alkynyl-functionalized poly(n-buty methacrylate)were used as polymeric.And the polymerics were conveniently and efficiently connected via hydrosilylation,with all conversions above 94.9%.The results of ~1H-NMR and SEC tests show that the molecular weight of linear diblock and triblock polymers and two miktoarm star polymers are similar,the dispersion is less than 1.11,and the two-phase proportion fraction is about 0.5,which lays a foundation for the study of phase separation domain spacing of block polymers.3.Then,diblock triblock and miktoarm star polymers were studied for the relationship between microphase separation and structure.The changed structures greatly affected the microphase domain spacing.The results showed that there is little difference between linear diblock and triblock polymers on microphase.Based on the self-consistent field theory(SCFT)simulating the effect of miktoarm structure of microphase separation mechanism.The changed local interface curvature of complex polymers affect microphase separation structure.In this paper,the size difference between miktoarm star structures and linear structure is about 10 nm in electron microscope analysis and SAXS analysis.The results show that the domain spacing is obviously affected by structure in the microphase separation of block polymer.