| 剪切场作用下环形二嵌段共聚物微相形态变化的耗散粒子动力学研究 |
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| 引用本文： | 刘伟,钱虎军,吕中元,李卓,孙家锺.剪切场作用下环形二嵌段共聚物微相形态变化的耗散粒子动力学研究[J].高等学校化学学报,2007,28(3):548-551. |
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| 作者姓名： | 刘伟 钱虎军 吕中元 李卓 孙家锺 |
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| 作者单位： | 吉林大学理论化学研究所,理论化学计算国家重点实验室,长春,130023 |
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| 基金项目： | 国家自然科学基金
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吉林省科技发展计划
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教育部留学回国人员科研启动基金
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吉林大学校科研和教改项目 |
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| 摘 要： | 采用耗散粒子动力学(Dissipative particle dynamics, DPD)方法研究了在剪切场作用下, 环形二嵌段共聚物微观相分离过程中的形态变化. 在层状(lamellae, LAM)体系中发生了微相的平行重取向和平行-垂直转变以及剪切导致的波动不稳定现象. 对于穿孔层状(Perforated lamellae, PL)体系, 强剪切导致了穿孔层状-柱状(Hexagonal cylinder, HEX)微相转变. 在剪切场作用下, 柱状体系中同样也有平行重取向发生. 可以用相区破坏-相区重生的两步机理描述微相的平行重取向、平行-垂直转变以及PL-HEX转变现象. 在球状相(Body centered cubic, BCC)体系中发现了剪切诱导相融合.
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| 关 键 词： | 剪切 环形嵌段共聚物 微观相分离 重取向 耗散粒子动力学 |
| 文章编号： | 0251-0790（2007）03-0548-04 |
| 收稿时间： | 2006-03-21 |
| 修稿时间： | 2006-03-21 |
Dissipative Particle Dynamics Study on Morphology Changes of Cyclic Diblock Copolymer Microphase Under Shear |
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| LIU Wei,QIAN Hu-Jun,L Zhong-Yuan,LI Zhuo,SUN Chia-Chung.Dissipative Particle Dynamics Study on Morphology Changes of Cyclic Diblock Copolymer Microphase Under Shear[J].Chemical Research In Chinese Universities,2007,28(3):548-551. |
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| Authors: | LIU Wei QIAN Hu-Jun L Zhong-Yuan LI Zhuo SUN Chia-Chung |
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| Institution: | State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China |
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| Abstract: | The morphology changes of cyclic diblock polymer microphases under simple shear were studied via DPD technique. For LAM, parallel reorientation and parallel-perpendicular orientation transition phenomena were reproduced. Moreover, the undulation instability was observed. For PL, PL-HEX transition occurs under a strong shear. For HEX, parallel reorientation was identified. A two stage reorientation mechanism involving break-up and phase reformation was proposed to describe the reorientation process for both LAM and HEX, and the PL-HEX transition. For BCC phase, shear-induced melting was found. |
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| Keywords: | Shear Cyclic block copolymer Microphase separation Reorientation Dissipative particle dynamics |
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