English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 78728/78728 (100%)
造訪人次 : 33351952      線上人數 : 442
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/26411


    題名: Osmotic pressure and virial coefficients of star and comb polymer solutions: Dissipative particle dynamics
    作者: Wang,TY;Fang,CM;Sheng,YJ;Tsao,HK
    貢獻者: 化學工程與材料工程學系
    關鍵詞: MONTE-CARLO;CROSSOVER-BEHAVIOR;BRANCHED POLYMERS;GOOD SOLVENTS;2ND;DILUTE;RENORMALIZATION;POLYSTYRENES;BENZENE;4-ARM
    日期: 2009
    上傳時間: 2010-06-29 17:27:26 (UTC+8)
    出版者: 中央大學
    摘要: The effects of macromolecular architecture on the osmotic pressure pi and virial coefficients (B-2 and B-3) of star and comb polymers in good solvents are studied by dissipative particle dynamics simulations for both dilute and semiconcentrated regimes. The dependence of the osmotic pressure on polymer concentration is directly calculated by considering two reservoirs separated by a semipermeable, fictitious membrane. Our simulation results show that the ratios A(n+1) equivalent to Bn+ 1/(R) over cap (3n)(g) are essentially constant and A(2) and A(3) are arm number (f) dependent, where (R) over cap (g) is zero-density radius of gyration. The value of dimensionless virial ratio g=A(3)/A(2)(2) increases with arm number of stars whereas it is essentially arm number independent for comb polymers. In semiconcentrated regime the scaling relation between osmotic pressure and volume fraction, pi(proportional to)phi(lambda), still holds for both star and comb polymers. For comb polymers, the exponent lambda is close to lambda* (approximate to 2.73 for linear chains) and is independent of the arm number. However, for star polymers, the exponent lambda deviates from lambda* and actually grows with increasing the arm number. This may be attributed to the significant ternary interactions near the star core in the many-arm systems. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3099721]
    關聯: JOURNAL OF CHEMICAL PHYSICS
    顯示於類別:[化學工程與材料工程研究所] 期刊論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML688檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明