Fluctuation-assisted crystallization: In a simultaneous phase separation and crystallization polyolefin blend system

被引：111
|
作者：
Zhang, XH
Wang, ZG
Muthukumar, M
Han, CC [1 ]
机构：
[1] Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Joint Lab Polymer Sci & Mat, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
[3] Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Joint Lab Polymer Sci & Mat, Beijing 100080, Peoples R China
[4] Univ Massachusetts, Dept Polymer Sci, Amherst, MA 01003 USA
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2005年 / 26卷 / 16期
关键词：
blends; concentration fluctuation; crystallization; phase separation; polyolefins;
D O I：
10.1002/marc.200500304
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The liquid-liquid phase separation (LLPS) is often coupled with other ordering processes such as crystallization. In a polyolefin blend system, overwhelming changes in crystallization kinetics due to concentration fluctuation caused by spontaneous spinodal LLPS have been observed. Consequently, we are proposing a new mechanism of "fluctuation-assisted crystallization". In this process, the usual nucleation barrier could be overcome (or at least partially) by the spontaneous fluctuation growth of LLPS in the spinodal region. Time-resolved polarized optical micrographs for poly-(ethylene-co-hexene) (PEH)/poly(ethylene-co-butene) (PEB) = 40.60 isothermally crystallized at 117 degrees C for 2 min after LLPS at 135 degrees C as a function of LLPS time at 135 degrees C.
引用
收藏
页码：1285 / 1288
页数：4
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