𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Thermal Behavior, Structure and Morphology of Propene/Higher 1-Olefin Copolymers

✍ Scribed by Paola Stagnaro; Giovanna Costa; Vincenzo Trefiletti; Maurizio Canetti; Fabrizio Forlini; Giovanni C. Alfonso

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
396 KB
Volume
207
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Summary: Propene‐based random copolymers, synthesized with two isospecific methylaluminoxane‐activated ansa‐zirconocenes and containing even and odd carbon‐numbered higher 1‐olefins, were investigated by DSC and WAXD. Nature and amount of co‐units affect primary and secondary crystallization as well as melting behavior; their role is discussed in the light of microstructural features of the macromolecular chains. The specific role of 1‐olefin comonomers in the development of the γ‐polymorph was assessed by crystallizing selected samples at relatively high temperatures. A good agreement between the fraction of γ‐phase calculated from the deconvolution of the DSC melting endotherms and from WAXD analysis was found. The γ‐phase content nicely correlates with the average length of the isotactic sequences. In the WAXD patterns of some propene/1‐butene copolymers a new reflection at 2__θ__ ≅ 10°, likely corresponding to the newly discovered trigonal modification of isotactic polypropene, was found.

Room temperature WAXD of copolymer M‐PBu7.5 after isothermal crystallization at two different temperatures.

magnified imageRoom temperature WAXD of copolymer M‐PBu7.5 after isothermal crystallization at two different temperatures.

📜 SIMILAR VOLUMES

Thermal Behavior and Structural Features
Thermal Behavior and Structural Features of Propene/1-Pentene Copolymers by Metallocene Catalysts
✍ Giovanna Costa; Paola Stagnaro; Vincenzo Trefiletti; Maria Carmela Sacchi; Fabri 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 114 KB

## Abstract Summary: Two families of propene/1‐pentene copolymers prepared with different isospecific metallocene catalysts, __rac__‐Et(Ind)~2~ZrCl~2~ and __rac__‐Me~2~Si(2‐MeBenz‐[__e__]Ind)~2~ZrCl~2~, containing increasing amounts of 1‐pentene were studied by differential scanning calorimetry (DS

13C NMR Study of Copolymers of Propene w
13C NMR Study of Copolymers of Propene with Higher 1-Olefins with New Microstructures by ansa-Zirconocene Catalysts
✍ Udo M. Wahner; Ioan Tincul; Dawid J. Joubert; Emmanuel R. Sadiku; Fabrizio Forli 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 129 KB

## Abstract Copolymers of propene and higher 1‐olefins (1‐butene, 1‐pentene, 1‐hexene, 1‐heptene, 1‐octene, and 4‐methyl‐1‐pentene (4M1P)), prepared with __rac__‐Et(Ind)~2~ZrCl~2~ (EI) and __rac__‐Me~2~Si(2‐MeBenz‐[__e__]Ind)~2~ZrCl~2~ (MBI), were comprehensively analyzed by ^13^C NMR spectroscopy.

Thermal behavior and morphological and r
Thermal behavior and morphological and rheological properties of polypropylene and novel elastomeric ethylene copolymer blends
✍ Yingwei Di; Salvatore Iannace; Luigi Nicolais 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 461 KB 👁 2 views

## Abstract The thermal behavior including melting and crystallization behavior and morphological and rheological properties of the blends based on an isotactic polypropylene and a novel maleated elastomeric ethylene copolymer were investigated in this work. The addition of an elastomer to polyprop

Morphology of homogeneous copolymers of
Morphology of homogeneous copolymers of ethene and 1-octene. I. Influence of thermal history on morphology
✍ M. Peeters; B. Goderis; C. Vonk; H. Reynaers; V. Mathot 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 789 KB

The morphology of homogeneous copolymers of ethene and 1-octene synthesized using a V-based Ziegler-Natta catalyst was studied as a function of the short chain branching content (SCBC) and the molar mass. Linear polyethylenes (LPE) were used as reference material. For the linear samples an increase