| Shear-induced crystallization in phase-separated blend of isotactic polypropylene and poly (ethylene-co-octene) | |
| Meng, Kun1; Dong, Xia1; Hong, Song1,2; Wang, Xin1; Cheng, He1; Han, Charles C.1 | |
| 刊名 | Journal of chemical physics
 |
| 2008-01-14 | |
| 卷号 | 128期号:2页码:8 |
| ISSN号 | 0021-9606 |
| DOI | 10.1063/1.2812927 |
| 通讯作者 | Dong, xia(xiadong@iccas.ac.cn) |
| 英文摘要 | Isothermal crystallization after shear in a blend of isotactic polypropylene (ipp) and poly (ethylene-co-octene) (peoc) was investigated by in situ optical microscopy and shear hot stage under various thermal and shear histories. crystalline cylindrites during growth were observed in phase-separated ipp/peoc blends for the first time. according to our results, the very long cylindrites are formed which are much longer than the dimensions of the liquid-liquid phase-separated domains under shear, and the cylindrites appear to grow through noncrystallizable domains, as well as through crystallizable ones. obviously, the nuclei ("shish") come from the oriented and entangled network strands instead of pulled-out long chains. the number of cylindrites and the distortion and breakup of the cylindrites are related to the shear rate and shear time. on the other hand, the number of spherulites increases not only with shear rate but also with liquid-liquid phase separation time. spherulites always form with longer induction time than cylindrites due to the different nucleation mechanism. the shish is nucleated through the shear-induced mechanism, and most of the spherulites are nucleated through liquid-liquid spinodal decomposition and crossover after the cessation of shear. during the process of experiments, we also found three kinds of shish-kebab structures, which provide further physical insights into the mechanism of the shish formation in polymer blend after liquid-liquid phase separation under shear. (c) 2008 american institute of physics. |
| WOS关键词 | FLOW-INDUCED CRYSTALLIZATION ; MOLECULAR-WEIGHT POLYETHYLENE ; X-RAY-SCATTERING ; SITU SMALL-ANGLE ; SUPERMOLECULAR STRUCTURE ; PHYSICAL GELATION ; ELONGATIONAL FLOW ; LIGHT-SCATTERING ; MELT ; PRECURSOR |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Atomic, Molecular & Chemical |
| 语种 | 英语 |
| 出版者 | AMER INST PHYSICS |
| WOS记录号 | WOS:000252450100041 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2384701 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Dong, Xia |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem,Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Meng, Kun,Dong, Xia,Hong, Song,et al. Shear-induced crystallization in phase-separated blend of isotactic polypropylene and poly (ethylene-co-octene)[J]. Journal of chemical physics,2008,128(2):8. |
| APA | Meng, Kun,Dong, Xia,Hong, Song,Wang, Xin,Cheng, He,&Han, Charles C..(2008).Shear-induced crystallization in phase-separated blend of isotactic polypropylene and poly (ethylene-co-octene).Journal of chemical physics,128(2),8. |
| MLA | Meng, Kun,et al."Shear-induced crystallization in phase-separated blend of isotactic polypropylene and poly (ethylene-co-octene)".Journal of chemical physics 128.2(2008):8. |
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