Re-entrance of Poly(N,N-diethylacrylamide) in D2O/d-Ethanol Mixture at 27 degrees C
文献类型：期刊论文
| 作者 | Jia D(贾迪); Rogers, S; Hammouda, B; Han, CC; Zuo TS(左太森); Cheng, H; Cheng H(程贺) ; Jia, D; Zuo, TS
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| 刊名 | MACROMOLECULES
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| 出版日期 | 2016 |
| 卷号 | 49期号:14页码:5152-5159 |
| DOI | 10.1021/acs.macromol.6b00785 |
| 通讯作者 | 程贺 |
| 英文摘要 | The re-entrance of poly(N,N-diethylacrylamide) (PDEA) in D2O/d-ethanol mixtures (i.e., the coil-to-spherical aggregates-to-coil transition) has been observed at 27 degrees C by small-angle neutron scattering (SANS). PDEA has a lower critical solution temperature (LCST) phase diagram in the D2O-rich region and is soluble in the D2O-poor region for all of the observed temperature ranges. Its spinodal temperature decreases first from 33.5 degrees C in pure D2O to 26.7 degrees C in 80% D2O/20% d-ethanol and then increases to 283.1 degrees C in 50% D2O/50% d-ethanol. With the further decrease of D2O content, PDEA dissolves well, and its phase boundary can no longer be observed by SANS. Therefore, at 27 degrees C, PDEA dissolves as random coils when the D2O content is higher than 90% and then collapses and aggregates to form the globule phase in 20% D2O/80% d-ethanol; finally, it reswells and behaves as random coils again with excluded volume in the D2O-poor region. The ternary random phase approximation model (RPA) is used to analyze the SANS profiles, and three Flory-Huggins interaction parameters (chi(PDEA-d-ethanol), chi(PDEA-D2O), and chi(d-ethanol-D2O)) are obtained. When a small amount of d-ethanol is added to the system, it has a strong interaction with D2O, so it directly gets distributed into the water structure and makes a negative contribution to the dissolution of PDEA (chi(d-ethanol-D2O) much smaller than chi(PDEA-d-ethanol) and chi(PDEA-D2O)). With the addition of more d-ethanol, its interaction with water becomes weaker, but still stronger than those between PDEA-D2O and PDEA-d-ethanol. Neither d-ethanol nor D2O wants to help the dissolution of PDEA in the first place, until the structure of mixed solvents tends to be pure d-ethanol in the D2O-poor region. |
| 学科主题 | Polymer Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000380576900017 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/260185]  |
| 专题 | 高能物理研究所_东莞分部 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Jia D,Rogers, S,Hammouda, B,et al. Re-entrance of Poly(N,N-diethylacrylamide) in D2O/d-Ethanol Mixture at 27 degrees C[J]. MACROMOLECULES,2016,49(14):5152-5159. |
| APA | 贾迪.,Rogers, S.,Hammouda, B.,Han, CC.,左太森.,...&Zuo, TS.(2016).Re-entrance of Poly(N,N-diethylacrylamide) in D2O/d-Ethanol Mixture at 27 degrees C.MACROMOLECULES,49(14),5152-5159. |
| MLA | 贾迪,et al."Re-entrance of Poly(N,N-diethylacrylamide) in D2O/d-Ethanol Mixture at 27 degrees C".MACROMOLECULES 49.14(2016):5152-5159. |
入库方式： OAI收割
来源：高能物理研究所
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