典型文献
Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions
文献摘要：
This work reports the structural feature and internal motion of one novel hyperbranching cluster system in dilution solution.The cluster system is composed of HB-PS300-g-PtBA45 hypergraft copolymer chains with uniform subchain,high molar mass and low polydispersity(Mw=1.73×106 g/mol and≈1.07),where HB-PS and PtBA represent hyperbranched polystyrene core and poly(tert-butyl polyacrylate)graft,respectively.In the selective solvent of PS blocks(cyclohexane,Tθ=34.5℃),the aggregation kinetics and structural feature are found to be precisely tunable for assembled clusters by the aggregation temperature(11℃＜T＜17℃)and time(0 h＜t＜24 h).An interesting structural evolution kinetics is observed,namely,the fractal dimension(df)of clusters is found to first increases and then decreases with t,eventually,it reaches a plateau value of df≈3.0,corresponds to a uniform spherical structure.By using dynamic light scattering(DLS)to monitor the number and strength of relaxation modes in Γ(q)with Γ being the decay rate and q being the scattering vector,it is quantitatively revealed that the relaxation,intensity contribution and mode origin of internal motions of clusters are neither similar with previously reported cluster systems with high polydispersity,nor with the classical linear chain systems.In particular,in the broad range of 2.0＜qRh＜6.0,we have observed that the reduced first cumulant[Γ*=r(q)/(q3kBT/η0)]does not display an asymptotic behavior.Whereas,a better asymptotic behavior is observed by plotting Γ(q)/q4 versus qRh.For the first time,our observation provides direct evidence supporting that,for hyperbranching cluster system with low polydispersity and high local chain segment density,the hydrodynamic interaction is greatly weakened due to the enhanced hydrodynamic shielding effect.
文献关键词：
中图分类号：
作者姓名：
Si-Qi Huang;Mo Zhu;Jin-Xian Yang;Lian-Wei Li
作者机构：
College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,China;Department of Chemical Physics,University of Science and Technology of China,Hefei230026,China
文献出处：
引用格式：
[1]Si-Qi Huang;Mo Zhu;Jin-Xian Yang;Lian-Wei Li-.Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions)[J].高分子科学（英文版）,2022(12):1515-1521
A类：
Hyperbranching,hyperbranching,PS300,PtBA45,hypergraft,subchain,PtBA,qRh,q3kBT
B类：
Structural,Internal,Motion,Cluster,System,Low,Polydispersity,Featured,Pattern,Dilute,Solutions,This,work,reports,structural,feature,internal,one,novel,dilution,solution,composed,HB,copolymer,chains,uniform,high,molar,mass,low,polydispersity,Mw,Mn,where,represent,hyperbranched,polystyrene,core,tert,butyl,polyacrylate,respectively,selective,solvent,blocks,cyclohexane,aggregation,kinetics,are,found,precisely,tunable,assembled,clusters,by,temperature,An,interesting,evolution,observed,namely,fractal,dimension,df,first,increases,then,decreases,eventually,reaches,plateau,value,corresponds,spherical,structure,By,using,light,scattering,DLS,monitor,number,strength,relaxation,modes,being,decay,rate,vector,quantitatively,revealed,that,intensity,contribution,origin,motions,neither,similar,previously,reported,systems,nor,classical,linear,particular,broad,range,have,reduced,cumulant,does,not,display,asymptotic,behavior,Whereas,better,plotting,q4,versus,For,our,observation,provides,direct,evidence,supporting,local,segment,density,hydrodynamic,interaction,greatly,weakened,due,enhanced,shielding,effect
AB值：
0.575887
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