Terpolymerization of Ethylene/Propylene/Diene Monomers Using (2‐PhInd)₂ZrCl₂ Metallocene Catalysts

Abstract

2-PhInd) 2 ZrCl 2 was synthesized and used for the first time in the terpolymerization of ethylene, propylene and 5-ethylidiene-2-norbornene (ENB). It showed appropriate activity, high incorporation ability of the comonomers and good workup in terpolymerization. Increasing the [Al]/[Zr] ratio up to 188:1 increased ethylene content and decreased the ENB content of the terpolymer. The higher the polymerization temperature, the lower the ethylene content and higher the ENB content that was obtained. A higher propylene content in the P/E feed ratio and ENB concentration led to higher ENB content of the EPDM product. A compounded EPDM showed good curing properties compared to a commercial EPDM.

Characteristics of linear/branched polyethylene reactor blends synthesized by metallocene/late transitional metal hybrid catalysts

“…The introduction of long-chain branches in the main backbone using dual catalytic system with one catalyst producing the so-called macromer due to high rate of b-hydride elimination and the other being open to incorporate the bulky macromere in the growing chain belongs to this category as well [8,9]. Also, the recent discovery by Dow chemicals on production of olefinic multi-block copolymers (OBC) using a chain shuttling agent, transferring the growing chain between two catalysts with distinguishable difference in comonomer incorporation ability [10][11][12][13][14][15], can also be accounted. However, many of the dual catalytic systems simply benefit from catalysts that produce chains possessing different microstructures independently.…”

Methods for Predicting Ethylene/Cyclic Olefin Copolymerization Rates Promoted by Single-Site Metallocene: Kinetics Is the Key

“…The 1 HNMR spectra of copolymer samples are shown in Supporting information Figure S2 . 1 H NMR was used to calculate the amount of inserted comonomers in the copolymers and the comonomer conversion according to the literature [ 35 , 36 , 37 ].…”

Polymerization kinetics of bicyclic olefins and mechanism with symmetrical ansa-metallocene catalysts associated with active center count: relationship between their activities and structure and activation path

“…† The peaks at 4.5 and 5.4 ppm conrmed the insertion of the endocyclic p bond in the polymer backbone. [43][44][45] The thermal properties of the E/VNB copolymers were performed using differential scanning calorimetry (DSC) analysis. The TA Q200 (DSC) instrument was calibrated with water and indium.…”

“…The peaks at 4.5 and 5.4 ppm confirmed the insertion of the endocyclic π bond in the polymer backbone. 43–45…”