Crystallization and morphology of cholesterol end-capped poly(ethylene glycol)
文献类型：期刊论文
| 作者 | Qiu, YJ; Xu, JT; Xue, L; Fan, ZQ; Wu, ZH ; Wu ZH(吴忠华)
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| 刊名 | JOURNAL OF APPLIED POLYMER SCIENCE
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| 出版日期 | 2007 |
| 卷号 | 103期号:4页码:2464-2471 |
| 关键词 | crystallization poly(ethylene glycol) end group cholesterol |
| 通讯作者 | Zhejiang Univ, Dept Polymer Sci & Engn, Key Lab Macromol Synth & Functionalizat, Hangzhou 310027, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100039, Peoples R China |
| 英文摘要 | Crystallization and morphology of polyethylene glycol with molecular weight M-n = 2000 (PEG2000) capped with cholesterol at one end (CS-PEG2000) and at both ends (CS-PEG2000-CS) were investigated. It is found that the bulky cholesteryl end group can retard crystallization rate and decrease crystallinity of PEG, especially for CS-PEG2000-CS. Isothermal crystallization kinetics shows that the Avrami exponent of CS-PEG2000 decreases as crystallization temperature (T-c). The Avrami exponent of CS-PEG2000-CS increases slightly with T-c, but it is lower than that of CS-PEG2000. Compared to the perfect spherulite morphology of PEG2000, CS-PEG2000 exhibits irregular and leaf-like spherulite morphology, while only needle-like crystals are observed in CS-PEG2000-CS. The linear growth rate of CS-PEG2000 shows a stronger dependence on T-c than PEG2000. The cholesterol end group alters not only the free energy of the folding surface, but also the temperature range of crystallization regime. The small angle X-ray scattering (SAXS) results show that lamellar structures are formed in all these three samples. By comparing the long periods obtained from SAXS with the theoretically calculated values, we find that the PEG chains are extended in PEG2000 and CS-PEG2000, but they are once-folded in CS-PEG2000-CS. (c) 2006 Wiley Periodicals, Inc. |
| 学科主题 | Polymer Science |
| 类目[WOS] | Polymer Science |
| 研究领域[WOS] | Polymer Science |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000243013900051 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/239758]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 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 | Qiu, YJ,Xu, JT,Xue, L,et al. Crystallization and morphology of cholesterol end-capped poly(ethylene glycol)[J]. JOURNAL OF APPLIED POLYMER SCIENCE,2007,103(4):2464-2471. |
| APA | Qiu, YJ,Xu, JT,Xue, L,Fan, ZQ,Wu, ZH,&吴忠华.(2007).Crystallization and morphology of cholesterol end-capped poly(ethylene glycol).JOURNAL OF APPLIED POLYMER SCIENCE,103(4),2464-2471. |
| MLA | Qiu, YJ,et al."Crystallization and morphology of cholesterol end-capped poly(ethylene glycol)".JOURNAL OF APPLIED POLYMER SCIENCE 103.4(2007):2464-2471. |
入库方式： OAI收割
来源：高能物理研究所
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