Unusual crystallization behavior of isotactic polypropylene and propene/1-alkene copolymers at large undercoolings

被引：21

作者：

Cavallo, D. ^{[1
]}

Zhang, L. ^{[1
]}

Portale, G. ^{[2
]}

Alfonso, G. C. ^{[1
]}

Janani, H. ^{[3
]}

Alamo, R. G.

机构：

[1] Univ Genoa, Dept Chem & Ind Chem, I-16146 Genoa, Italy

[2] European Synchrotron Radiat Facil, Netherlands Org Sci Res NWO, DUBBLE CRG, F-38043 Grenoble, France

[3] FAMU FSU, Coll Engn, Dept Chem & Biomed Engn, Tallahassee, FL 32310 USA

来源：

POLYMER | 2014年 / 55卷 / 15期

基金：

美国国家科学基金会;

关键词：

Polymer crystallization; Isotactic polypropylene; Mesophase; EQUILIBRIUM MELTING-POINT; MESOPHASE FORMATION; ISOTHERMAL CRYSTALLIZATION; PROPYLENE COPOLYMERS; CRYSTAL; PHASE; KINETICS; GROWTH; MORPHOLOGY; COMONOMER;

D O I：

10.1016/j.polymer.2014.05.053

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

During the investigation of the crystallization of metallocene isotactic polypropylene and copolymers with low amount of 1-butene and 1-hexene at large undercoolings, an unexpected behavior has been found. Random copolymers crystallize faster than the homopolymer between 80 and 40 degrees C, while at high temperatures the overall crystallization rates follow the expected trend. On the basis of structural and morphological evidences we suggest that the overall structuring kinetics of the homopolymer is slowed down by the concomitant formation of mesophase and monoclinic structures. This effect is absent in the copolymers because the branched counits retard the development of mesophase. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：3234 / 3241

页数：8

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