Copolymerization behavior of Cp2ZrCl2/MAO and [(CO)5WC(Me)OZrCp2Cl]/MAO: a comparative study on ethylene/1-pentene copolymers

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

“…The decrease by a factor of 10 in the polymer molecular weight is due to termination transfer reactions promoted by the presence of the comonomer . This phenomenon has been previously observed in the copolymerization of either linear or cyclic olefin comonomers . Changes in the polymer molecular weight will have consequences on the properties of the material, adding another variable in the discussion about the properties of copolymer‐based materials (see below for details).…”

Recent Advances in High-Temperature Fractionation of Polyolefins

“…They depicted that the MMD effect is more pronounced for lower molar masses but can also be noticed for higher molar mass samples. Luruli et al [58] synthesized ethylene/1-pentene copolymers using Cp 2 ZrCl 2 (1)/MAO and [(CO) 5 W ¼ C(Me)OZr(Cp) 2 Cl] (2)/MAO catalyst systems. They have used a combination of several analytical techniques like SEC, DSC, FTIR, 13 C NMR and CRYSTAF to analyze the products and correlate the findings with the efficiency of the catalysts used.…”

Monitoring the Chemical Heterogeneity and the Crystallization Behavior of PP‐g‐PS Graft Copolymers Using SEC‐FTIR and CRYSTAF

“…The coupling of SEC and Fourier‐transform infrared (FTIR) spectroscopy is a powerful technique for profiling the chemical composition as a function of molar mass. Despite of the significant advantages of SEC‐FTIR compared to conventional methods, there are comparatively few applications of this technique to the analysis of polyolefin materials 3–11. Crystallization analysis fractionation (CRYSTAF)12–15 separates semicrystalline materials on the basis of their crystallizability.…”

“…Although it is claimed that the copolymers produced with metallocenes have a homogeneous incorporation of comonomer, it has been found that this conclusion is not always valid. For example, nonhomogeneous chemical distributions were found in the copolymers by Luruli et al8 and Tso and DesLauriers,11 although metallocene catalysts were used. The chemical homogeneity of branches was not been verified for PP‐ g ‐PS graft copolymers prepared by us1, 2 and other groups 16, 17.…”