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Crystallization and morphology of cholesterol end-capped poly(ethylene glycol)
Qiu, YJ; Xu, JT; Xue, L; Fan, ZQ; Wu, ZH; Wu ZH(吴忠华)
2007
发表期刊JOURNAL OF APPLIED POLYMER SCIENCE
卷号103期号:4页码:2464-2471
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
文章类型Article
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.
关键词crystallization poly(ethylene glycol) end group cholesterol
学科领域Polymer Science
研究领域[WOS]Polymer Science ; Polymer Science
DOI10.1002/app.25362
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语种英语
研究领域[WOS]Polymer Science ; Polymer Science
WOS类目Polymer Science
WOS记录号WOS:000243013900051
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239758
专题多学科研究中心
作者单位中国科学院高能物理研究所
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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.
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