Acceleration or retardation to crystallization if liquid-liquid phase separation occurs: Studies on a polyolefin blend by SAXS/WAXD, DSC and TEM
文献类型：期刊论文
| 作者 | Niu, Yanhua; Wang, Zhigang; Orta, Carlos Avila; Xu, Donghua; Wang, Howard; Shimizu, Katsumi; Hsiao, Benjamin S.; Han, Charles C. |
| 刊名 | POLYMER
 |
| 出版日期 | 2007-10-19 |
| 卷号 | 48期号:22页码:6668-6680 |
| 关键词 | Crystallization Liquid-liquid Phase Separation Polyolefin Blend |
| ISSN号 | 0032-3861 |
| DOI | 10.1016/j.polymer.2007.08.060 |
| 英文摘要 | Blends of statistical copolymers containing ethylene/hexene (PEH) and ethylene/butene (PEB) exhibited the behavior of upper critical solution temperature (UCST). The interplay between the early and intermediate stage liquid-liquid phase separation (LLPS) and crystallization of the PEH/PEB 50150 blend was studied by time-resolved simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. Samples were treated by two different quench procedures: in single quench, the sample was directly quenched from 160 degrees C to isothermal crystallization temperature of 114 degrees C; while in double quench, the sample was firstly quenched to 130 degrees C for 20 min annealing, where LLPS occurred, and then to 114 degrees C. It was found that in the early stage of crystallization, the integrated values of Iq(2) and crystallinity, X(c,) in the double quench procedure were consistently higher than those in the single quench procedure, which could be attributed to accelerated nucleation induced by enhanced concentration fluctuations and interfacial tension. In the late stage of crystallization, some morphological parameters were found to crossover and then reverse, which could be explained by retardation of lamellar growth due to phase separation formed during the double quench procedure. This phenomenon was also confirmed by DSC measurements in blends of different compositions at varying isothermal crystallization temperatures. The crystal lamellar thickness determined by SAXS showed a good agreement with TEM observation. Results indicated that the early stage LLPS in the PEH/PEB blend prior to crystallization indeed dictated the resulting lamellar structures, including the average size of lamellar stack and the stack distribution. There seemed to be little variation of lamellar thickness and long period between the two quenching procedures (i.e., single quench versus double quench). (C) 2007 Elsevier Ltd. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000250899600022 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/60521]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Wang, Zhigang |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Joint Dis Polymer Sci & Mat,CAS Key Lab Engn Pla, Beijing 100080, Peoples R China 2.Ctr Invest Quim Aplicada, Saltillo 25253, Coahuila, Mexico 3.SUNY Binghamton, Dept Engn Mech, Binghamton, NY 13902 USA 4.RIKEN Harima Inst, Adv Protein Crystallography Res Grp, Hyogo 6795148, Japan 5.SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA |
| 推荐引用方式 GB/T 7714 | Niu, Yanhua,Wang, Zhigang,Orta, Carlos Avila,et al. Acceleration or retardation to crystallization if liquid-liquid phase separation occurs: Studies on a polyolefin blend by SAXS/WAXD, DSC and TEM[J]. POLYMER,2007,48(22):6668-6680. |
| APA | Niu, Yanhua.,Wang, Zhigang.,Orta, Carlos Avila.,Xu, Donghua.,Wang, Howard.,...&Han, Charles C..(2007).Acceleration or retardation to crystallization if liquid-liquid phase separation occurs: Studies on a polyolefin blend by SAXS/WAXD, DSC and TEM.POLYMER,48(22),6668-6680. |
| MLA | Niu, Yanhua,et al."Acceleration or retardation to crystallization if liquid-liquid phase separation occurs: Studies on a polyolefin blend by SAXS/WAXD, DSC and TEM".POLYMER 48.22(2007):6668-6680. |
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来源：化学研究所
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