Rheology of long-chain branched polypropylene copolymers

被引：21
|
作者：
Zulli, Fabio [1 ,2 ]
Andreozzi, Laura [1 ,2 ]
Passaglia, Elisa [3 ]
Augier, Sylvain [4 ]
Giordano, Marco [1 ,2 ]
机构：
[1] Univ Pisa, Dept Phys Enrico Fermi, I-56127 Pisa, Italy
[2] IPCF CNR, I-56127 Pisa, Italy
[3] ICCOM CNR UOS Pisa, Area Ric, I-56124 Pisa, Italy
[4] Univ Pisa, Dept Chem & Ind Chem, I-56124 Pisa, Italy
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2013年 / 127卷 / 02期
关键词：
rheology; polypropylene; long-chain branching; viscosity; shear-thinning; functionalization; ETHYLENE-PROPYLENE COPOLYMER; MELT RHEOLOGY; CROSS-LINKING; ISOTACTIC POLYPROPYLENE; VISCOELASTIC BEHAVIOR; GLYCIDYL METHACRYLATE; MOLECULAR-STRUCTURE; MALEIC-ANHYDRIDE; ELECTRON-BEAM; DEGRADATION;
D O I：
10.1002/app.38076
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
In this work, we provide more insight into the rheological properties of functionalized polypropylene copolymers with modified architectures, which originate long-chain branching. The evaluation of the average distance between branches and the fraction of long-chain branch points has been carried out quantitatively, by numerical fitting of experimental data according to a literature model, and the viscoelastic response of the samples has been analyzed in terms of a Carreau-Yasuda-like model and ColeCole plots. These analyses allowed us to discriminate the viscoelastic behavior of the samples on the basis of their feed composition. Moreover, we were able to highlight direct correlations between viscosity, long-chain branching level, distance between branching points and functionalization degrees of PP polymers. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
引用
收藏
页码：1423 / 1432
页数：10
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