Experimental and theoretical studies of scaling of sizes and intrinsic viscosity of hyperbranched chains in good solvents
文献类型：期刊论文
| 作者 | Li LW ; Lu YY ; An LJ ; Wu C |
| 刊名 | journal of chemical physics
 |
| 出版日期 | 2013 |
| 卷号 | 138期号:11页码:文献号: 114908 |
| 关键词 | CLICK CHEMISTRY BRANCHED POLYMERS AROMATIC POLYESTERS AB(2) MACROMONOMERS ANGULAR-DEPENDENCE UNIFORM SUBCHAINS LIGHT-SCATTERING DENDRIMERS MACROMOLECULES POLYSTYRENE |
| ISSN号 | 0021-9606 |
| 通讯作者 | li lw |
| 中文摘要 | using a set of hyperbranched polystyrenes with different overall molar masses but a uniform subchain length or a similar overall molar mass but different subchain lengths, we studied their sizes and hydrodynamic behaviors in toluene (a good solvent) at t = 25 degrees c by combining experimental (laser light scattering (lls) and viscometry) and theoretical methods based on a partially permeable sphere model. our results show that both the average radii of gyration (< rg >) and hydrodynamic radius (< rh >) are scaled to the weight-average molar mass (mw) as < r-g > similar to < r-h > similar to (mwmw,s phi)-m-gamma with gamma = 0.47 +/- 0.01 and phi = 0.10 +/- 0.01; and their intrinsic viscosity ([eta]) quantitatively follow the mark- houwink-sakurada (mhs) equation as [eta] = k-eta m-w m-nu(w,s) (mu) with k-eta = 2.26 x 10(-5),. nu = 0.39 +/- 0.01, and mu = 0.31 +/- 0.01, revealing that these model chains with long subchains are indeed fractal objects. further, our theoretical and experimental results broadly agree with each other besides a slight deviation from the mhs equation for short subchains, similar to dendrimers, presumably due to the multi- body hydrodynamic interaction. moreover, we also find that the average viscometric radius (< r-eta >) determined from intrinsic viscosity is slightly smaller than < r-h > measured in dynamic lls and their ratio (< r eta >/< rh >) roughly remains 0.95 +/- 0.05, reflecting that linear polymer chains are more draining with a smaller < r-h > than their hyperbranched counterparts for a given intrinsic viscosity. our current study of the " defect- free" hyperbranched polymer chains offers a standard model for further theoretical investigation of hydrodynamic behaviors of hyperbranched polymers and other complicated architectures, in a remaining unexploited research field of polymer science. (c) 2013 american institute of physics. [http://dx.doi.org/10.1063/1.4795577] |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000316544500045 |
| 公开日期 | 2014-04-16 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/49965]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Li LW,Lu YY,An LJ,et al. Experimental and theoretical studies of scaling of sizes and intrinsic viscosity of hyperbranched chains in good solvents[J]. journal of chemical physics,2013,138(11):文献号: 114908. |
| APA | Li LW,Lu YY,An LJ,&Wu C.(2013).Experimental and theoretical studies of scaling of sizes and intrinsic viscosity of hyperbranched chains in good solvents.journal of chemical physics,138(11),文献号: 114908. |
| MLA | Li LW,et al."Experimental and theoretical studies of scaling of sizes and intrinsic viscosity of hyperbranched chains in good solvents".journal of chemical physics 138.11(2013):文献号: 114908. |
入库方式： OAI收割
来源：长春应用化学研究所
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