Unusual phase behavior of a mesogen-jacketed liquid crystalline polymer synthesized by atom transfer radical polymerization
文献类型：期刊论文
| 作者 | Zhao, YF; Fan, XH; Wan, XH; Chen, XF; Yi, Y; Wang, LS; Dong, X; Zhou, QF |
| 刊名 | MACROMOLECULES
 |
| 出版日期 | 2006-02-07 |
| 卷号 | 39期号:3页码:948-956 |
| ISSN号 | 0024-9297 |
| DOI | 10.1021/ma0514370 |
| 英文摘要 | A series of mesogen-jacketed liquid crystalline polymers, poly{2,5-bis[(4-butoxyphenyl)oxycarbonyl]-styrenes} (PBPCS), with a wide range of molecular weights (M-n = 1.24 x 10(4) - 35.6 x 10(4)) and narrow molecular weight distributions (M-w/M-n <= 1.18) have been synthesized by atom transfer radical polymerization. The resulting polymers have been investigated by a combination of techniques including differential scanning calorimetry, polarized optical microscopy, and X-ray scattering. The samples with M-n <= 2.42 x 10(4) are isotropic. The samples with M-n >= 3.36 x 10(4) display a thermodynamically stable isotropic phase at lower temperature and a liquid crystalline (LC) phase at higher temperature. The phase behavior shows a phenomenon quite similar to the reentrant isotropic phase. These transitions are correlated with the rheological properties measured as a function of temperature. The rheological behavior of the polymer in the isotropic phase and in the LC phase has been studied as well. On the basis of these experimental observations, a generalized phase diagram is constructed for the polymers showing the influence of the molecular weight on the phase transition temperature. It is illustrated that LC phase is formed through a global change of the whole molecule from the coiled to extended chain conformation accompanied by an increase of the entropy. Higher entropy originating from the free mobilities of bulky side chains in LC phase has been proposed to be an important factor to stabilize the LC phase. |
| 语种 | 英语 |
| WOS记录号 | WOS:000235200500009 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/58297]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Fan, XH |
| 作者单位 | 1.Peking Univ, Coll Chem & Mol Engn, Dept Polymer Sci & Engn, Beijing 100871, Peoples R China 2.Beijing Univ, Minist Educ, Key Lab Polymer Chem & Phys, Beijing 100871, Peoples R China 3.China Petr & Chem Corp, Beijing Res Inst Chem Ind, Beijing 100013, Peoples R China 4.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, YF,Fan, XH,Wan, XH,et al. Unusual phase behavior of a mesogen-jacketed liquid crystalline polymer synthesized by atom transfer radical polymerization[J]. MACROMOLECULES,2006,39(3):948-956. |
| APA | Zhao, YF.,Fan, XH.,Wan, XH.,Chen, XF.,Yi, Y.,...&Zhou, QF.(2006).Unusual phase behavior of a mesogen-jacketed liquid crystalline polymer synthesized by atom transfer radical polymerization.MACROMOLECULES,39(3),948-956. |
| MLA | Zhao, YF,et al."Unusual phase behavior of a mesogen-jacketed liquid crystalline polymer synthesized by atom transfer radical polymerization".MACROMOLECULES 39.3(2006):948-956. |
入库方式： OAI收割
来源：化学研究所
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