Time-resolved synchrotron SAXS observations on sheared syndiotactic poly(propylene) crystallization process

被引：15

作者：

Wen, Huiying ^{[1
,3
]}

Jiang, Shichun ^{[1
,2
]}

Men, Yongfeng ^{[1
]}

An, Lijia ^{[1
]}

Wu, Zhonghua ^{[4
]}

Okuda, Hiroshi

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

[2] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China

[3] NE Foresty Univ, Coll Engn & Technol, Harbin 150040, Peoples R China

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100039, Peoples R China

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2008年 / 209卷 / 16期

基金：

中国国家自然科学基金;

关键词：

crystallization; lamellae; mesomorphic structure; mesophase; SAXS; synchrotron;

D O I：

10.1002/macp.200800112

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 in situ crystallization kinetics of syndiotactic poly(propylene) (sPP) has been investigated by synchrotron small-angle X-ray scattering (SAXS). The structure evolutions during the isothermal crystallization of sPP with different shear rates have been observed. The results show that shear accelerates the process of crystallization kinetics. Even under low shear rate, the lamellae can be distinctly oriented. In contrast, the lamellar parameters such as the long period, lamellar thickness, and the scattering invariant 0 can change obviously only under high shear rate. A mesomorphic structure proposed by Strobl is adopted to elucidate the differences of shear effects with low and high shear rates. Based on all the analysis we are convinced that a relatively stable mesomorphic structure forms before shear is composed and the shear effects on the mesophase will be retained to a certain extent until crystallization is finished.

引用

页码：1721 / 1729

页数：9

共 45 条

[1] Shear-induced crystallization in novel long chain branched polypropylenes by in situ rheo-SAXS and -WAXD [J].

Agarwal, PK ;

Somani, RH ;

Weng, WQ ;

Mehta, A ;

Yang, L ;

Ran, SF ;

Liu, LZ ;

Hsiao, BS .

MACROMOLECULES, 2003, 36 (14) :5226-5235

[2]

Alexander L.E., 1969, XRAY DIFFRACTION MET

[3] Characterization of strain-induced crystallization of poly(ethylene terephthalate) at fast draw rates using synchrotron radiation [J].

Blundell, DJ ;

MacKerron, DH ;

Fuller, W ;

Mahendrasingam, A ;

Martin, C ;

Oldman, RJ ;

Rule, RJ ;

Riekel, C .

POLYMER, 1996, 37 (15) :3303-3311

[4] CRYSTAL-STRUCTURE OF SYNDIOTACTIC POLYPROPYLENE [J].

DEROSA, C ;

CORRADINI, P .

MACROMOLECULES, 1993, 26 (21) :5711-5718

[5] SYNDIOSPECIFIC PROPYLENE POLYMERIZATIONS WITH GROUP-4 METALLOCENES [J].

EWEN, JA ;

JONES, RL ;

RAZAVI, A ;

FERRARA, JD .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1988, 110 (18) :6255-6256

[6]

FERNANDEZBLAZQU.JP, 2006, MACROMOLECULES, V37, P9018

[7] Crystallization of s-polypropylene from the glassy state:: Indications for a multistage process [J].

Grasruck, M ;

Strobl, G .

MACROMOLECULES, 2003, 36 (01) :86-91

[8]

HAMMERSLEY AP, 1998, COMPUTER PROGRAM FIT

[9] Effect of shear flow on multi-component polymer mixtures [J].

Han, CC ;

Yao, YH ;

Zhang, RY ;

Hobbie, EK .

POLYMER, 2006, 47 (10) :3271-3286

[10] Steps in the transition of an entangled polymer melt to the partially crystalline state [J].

Heck, B. ;

Hugel, T. ;

Iijima, M. ;

Sadiku, E. ;

Strobl, G. .

NEW JOURNAL OF PHYSICS, 1999, 1

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