Thermal behavior and structural features of propene/1-pentene copolymers by metallocene catalysts

被引：15
作者：
Costa, G
Stagnaro, P
Trefiletti, V
Sacchi, MC
Forlini, F
Alfonso, GC
Tincul, I
Wahner, UM
机构：
[1] CNR, ISMAC, Sez Genova, I-16149 Genoa, Italy
[2] CNR, ISMAC, I-20133 Milan, Italy
[3] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy
[4] Sasol Technol, ZA-1947 Sasolburg, South Africa
来源：
MACROMOLECULAR CHEMISTRY AND PHYSICS | 2004年 / 205卷 / 03期
关键词：
copolymerization; metallocene catalysts; microstructure; propene; thermal properties;
D O I：
10.1002/macp.200300127
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Two families of propene/1-pentene copolymers prepared with different isospecific metallocene catalysts, rac-Et(Ind)(2)ZrCl2 and rac-Me2Si(2-MeBenz-[e]Ind)(2)ZrCl2, containing increasing amounts of 1-pentene were studied by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). The thermal behavior of the copolymers was correlated with their microstructural features and a relationship between melting temperatures and average length of the isotactic sequences was established. Furthermore, the influence of the comonomer on the degree and type of crystallinity of the copolymers was investigated. Preliminary WAXD results demonstrate that only the alpha-modification is present when crystallization takes place under fast cooling conditions, both in crystallized samples as well as in samples that had been aged for several weeks at room temperature.
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收藏
页码：383 / 389
页数：7
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