6533b7d0fe1ef96bd125a47d
RESEARCH PRODUCT
Studies on the microstructure of ethylene/1-hexene copolymers prepared over heterogeneous Ziegler - Natta catalysts
Marzena BiałekKrystyna Czajasubject
EthyleneMaterials sciencePolymers and PlasticsbiologyGeneral Chemical EngineeringmicrostructureNattaethylene/1-hexene copolymersbiology.organism_classificationMicrostructurereactivity ciefficientsCatalysis1-Hexenechemistry.chemical_compoundchemistryMgCl2(THF)2-supported V and Ti catalystsMaterials ChemistryCopolymerOrganic chemistrydescription
Three MgCl 2(THF) 2-supported, AlEt 2Cl-activated VOCl 3, VCl 4 and TiCl 4 Ziegler - Natta catalysts were used to copolymerize ethylene with 1-hexene in the presence of hydrogen to prepare low-M well-soluble copolymers that could be analyzed by 13C-NMR. The spectra (Fig. 1) showed resonance signals due to ethylene and 1-hexene units in positions unaffected by catalyst type and with intensities related to the degree of comonomer incorporation into the copolymer. The triad sequence distribution and comonomer reactivity ratios (r) were calculated by the Randall method [11] and Bernoulli statistics based on the known copolymer composition. The latter appeared to be the more valid in predicting the comonomer triad distribution in the copolymer. All copolymers were found to be random (r Er H = 1) (Tables 4, 5). Compared with titanium, vanadium catalysts provided the higher monomer reactivity of ethylene toward α-olefin.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-05-01 | Polimery |