Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide
文献类型：期刊论文
| 作者 | Liu GH ; Qiu XP ; Siddiq M ; Bo SQ ; Ji XL |
| 刊名 | chemical research in chinese universities
 |
| 出版日期 | 2013 |
| 卷号 | 29期号:5页码:1022-1028 |
| 关键词 | LASER-LIGHT-SCATTERING FLUORINE-CONTAINING POLYIMIDES DILUTE-SOLUTION AROMATIC POLYIMIDES INTRINSIC-VISCOSITY MOLECULAR-WEIGHT DIAMINE PARAMETERS POLYMERS BEHAVIOR |
| ISSN号 | 1005-9040 |
| 通讯作者 | bo sq |
| 中文摘要 | temperature dependence of chain conformation and local rigidity of two soluble isomerized polyimides (pis), poly(hexafluorodianhydride/3,3'-dimethylbenzidine)[poly(6fda/3,3'-dmb)] and poly(hexafluorodianhy-dride/2,2'-dimethylbenzidine)[poly(6fda/2,2'-dmb)] were investigated by dilute solution viscosity, size exclusion chromatography(sec) coupled with multi-angle laser light scattering, viscometer, and refractive index detector in dimethylformamide(dmf) with either 0.1 mol/l libr or 3.1 mmol/l tetrabutylammonium bromide(tbab) in the temperature range of 30 to 50 a degrees c. the scaling relationships of [eta]=k (eta) m (alpha) and r (g)=k (g) m (nu) obtained are employed to investigate the temperature dependence of chain conformation for the two polyimides. the values of alpha and nu are in the range of 0.66-0.69 and 0.53-0.56, respectively, for poly(6fda/3,3'-dmb), meanwhile they are in the range of 0.64-0.68 and 0.53-0.56, respectively, for poly(6fda/2,2'-dmb). these results reveal that random coil conformations for both pis are not affected visibly with increasing temperature from 30 a degrees c to 50 a degrees c. however, values of more exact intrinsic viscosity from dilute solution measurement indicate there is only tiny coil extension or shrinkage for both pis with temperature rising. parameters related to chain flexibility of polymer, including persistence length l (p), shift factor m (l) (relative molecular weight per unit contour length) and backbone diameter d are estimated from the relationship between intrinsic viscosity and molecular weight for the continuous wormlike cylinder model, which indicates that two samples are flexible chains, only the chain of poly(6fda/3,3'-dmb) is stiffer than that of poly(6fda/2,2'-dmb) slightly. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000325359400038 |
| 公开日期 | 2014-04-15 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/49571]  |
| 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 | Liu GH,Qiu XP,Siddiq M,et al. Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide[J]. chemical research in chinese universities,2013,29(5):1022-1028. |
| APA | Liu GH,Qiu XP,Siddiq M,Bo SQ,&Ji XL.(2013).Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide.chemical research in chinese universities,29(5),1022-1028. |
| MLA | Liu GH,et al."Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide".chemical research in chinese universities 29.5(2013):1022-1028. |
入库方式： OAI收割
来源：长春应用化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。