Synthesis and characterization of butadiene-1,3 and octene-1 copolymer prepared by a Ziegler-Natta catalyst based on neodymium

Gustavo M Silva,Daniele F C Junger,Marcos A S Costa,Fernanda M B Coutinho,Ivana L Mello

doi:10.1590/s0104-14282011005000059

Gustavo M Silva, Daniele F C Junger + Show 3 more

Open Access

https://doi.org/10.1590/s0104-14282011005000059

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Abstract

The aim of this work is to evaluate the influence of octene-1 incorporation in the polybutadiene chain on the polymerization reaction and polymer characteristics. Thus, copolymerization of butadiene-1,3 with octene-1 using a Ziegler-Natta ternary catalyst based on neodymium was performed. The weight ratios of butadiene-1,3/α-olefin 100/0, 99/1, 97/3, 95/5, 90/10, 80/20 and 70/30 were evaluated. The copolymers were characterized by size exclusion chromatography (SEC), infrared spectroscopy (FTIR) and thermogravimetric analysis (TG). The results showed that the degradation temperature (Tmax) was not affected by the addition of alpha-olefin, while the thermal behavior has undergone significant changes. The polymer microstructure was not influenced by the increasing of octene-1 content. However, a tendency to molecular mass increase was observed with the increasing of octene-1 content. It was also observed a trend in reduction of the polymerization conversion as the octene-1 content increased.

Highlights

Polydienes, such as high cis-polybutadiene, can be produced by Ziegler-Natta catalyst based polyisoprene
The insertion of short alkyl chains on different neodymium’s salts. These catalyst systems causes a great influence in the copolymer thermal and mechanical produce a polymer with good mechanical properties, especially properties, because they act as internal plasticizers of the higher tensile strength, lower heat buildup, and better abrasion amorphous material
According to Britto et al.[21], this fact is justifiable because the propagation constant involving the insertion of α-olefin in chain growth is approximately sixty times smaller than the constant which involves the insertion of diene

Summary

Introduction

Polydienes, such as high cis-polybutadiene (cis microstructure highly stereospecific, affording nearly quantitatively 1–4 transN up to 99% ), can be produced by Ziegler-Natta catalyst based polyisoprene. The insertion of short alkyl chains on different neodymium’s salts. These catalyst systems causes a great influence in the copolymer thermal and mechanical produce a polymer with good mechanical properties, especially properties, because they act as internal plasticizers of the higher tensile strength, lower heat buildup, and better abrasion amorphous material. Some procedures can be carried out to improve the Makovetsky et al.[13] proposed a route for the preparation of processability of polydienes, such as the insertion of some branched polybutadiene, in which butadiene is copolymerized branches into polymer chain[3,9,10,11,12], copolymerization of dienes with a macromonomer (polybutadiene of low molecular mass with oligomers[13], copolymerization of dienes and α-olefin with containing a conjugated system of double bonds at one end of different lengths chains[14,15,16], insertion of branches with chain-end the molecule). The incorporation of olefins with monomer or by removing the hydrogen β

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