Phase behavior and interfacial properties of symmetric polymeric ternary blends A/B/AB  

作　　者：LIU XiaoHan BAI ZhiQiang YANG KeDa SU JiaYe GUO HongXia 

机构地区：[1]Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Sciences and Materials [2]State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences

出　　处：《Science China Chemistry》2013年第12期1710-1721,共12页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21174154,20874110,50930002)

摘　　要：In this paper, the phase behavior and interracial properties of symmetric ternary polymeric blends A/B/AB are studied by dissipative particle dynamics （DPD） simulations. By using the structure factor and nematic order parameter, we carefully characterized the diversified phases and phase transitions, and established the phase diagram of such symmetric ternary blends. It can be generally divided into four regions： disordered phase （DIS） region at high temperature, ordered lameUar phase （LAM） region, bicontinuous microemulsion （BμE） channel and phase-separated phase （2P） region at low temperature with the increase of the total volume fractions of homopolymers φn, which shows good accordance with that in previous experimental and theoretical reports. Furthermore, we calculated the elastic constants of 2P and LAM phase, and discussed the transition mechanisms from 2P and LAM to BμE phase, respectively. The results show a direct relevance between the phase transitions and the change of interfacial properties. Finally, we also demonstrate that the B,uE channel becomes narrower in lower temperature caused by the temperature dependence of interfacial properties of ternary blends.In this paper,the phase behavior and interfacial properties of symmetric ternary polymeric blends A/B/AB are studied by dissipative particle dynamics(DPD)simulations.By using the structure factor and nematic order parameter,we carefully characterized the diversified phases and phase transitions,and established the phase diagram of such symmetric ternary blends.It can be generally divided into four regions:disordered phase(DIS)region at high temperature,ordered lamellar phase(LAM)region,bicontinuous microemulsion(BμE)channel and phase-separated phase(2P)region at low temperature with the increase of the total volume fractions of homopolymersФH,which shows good accordance with that in previous experimental and theoretical reports.Furthermore,we calculated the elastic constants of 2P and LAM phase,and discussed the transition mechanisms from 2P and LAM to BμE phase,respectively.The results show a direct relevance between the phase transitions and the change of interfacial properties.Finally,we also demonstrate that the BμE channel becomes narrower in lower temperature caused by the temperature dependence of interfacial properties of ternary blends.

关 键 词：symmetric ternary blend phase behavior bicontinuous microemulsion dissipative particle dynamics 

分 类 号：O631.3[理学—高分子化学]