Performance of a Bis(imine)Pyridine Iron Catalyst System in Ethylene/Norbornene Copolymerization with Zinc Diethyl

Pereira, Leticia; Marques, Maria de Fátima Vieira

doi:10.1002/masy.201300166

Cited by 4 publications

(4 citation statements)

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“…19 The addition of CTAs increased the catalytic activity, 19 while molar mass and norbornene content decreased, which is in agreement with the previous observations (Table 2). 20 The possibility of chain transfer from salicylaldimine or αdiimine late transition metal complexes to various metal alkyls during ethene polymerization was thoroughly investigated. 21 Initial screening revealed that only α-diimine Ni complexes (11a−c, Figure 3), in the presence of Zn based CTAs, are capable of providing efficient chain transfer.…”

Section: Coordinative Chain Transfer Polymerizationmentioning

confidence: 99%

“…71,72 The addition of Et 2 Zn led to the molar mass decreasing and, a lower incorporation of norbornene (0.8−1.0 vs 1.6%, Table 2), while the overall catalytic activity was preserved. 20…”

Section: Mechanistic Studies and Extension Of Known Systemsmentioning

confidence: 99%

“…Ethene/norbornene copolymers were obtained by the bis(imino)pyridine iron dichloride complex 7a (Figure ) activated with MAO, initially reported for catalyzed chain growth (CCG) of ethene on Zn. , The addition of Et 2 Zn led to the molar mass decreasing and, a lower incorporation of norbornene (0.8–1.0 vs 1.6%, Table ), while the overall catalytic activity was preserved …”

Section: Coordinative Chain Transfer Polymerizationmentioning

confidence: 99%

“…However, the individual mechanistic steps (dissociation of aluminum alkyls from iron alkyls, ethene insertion, alkyl exchange, and βhydride elimination) are strongly dependent on the applied substitution pattern, which determines the nature of the resulting product. 70 Ethene/norbornene copolymers 20 were obtained by the bis(imino)pyridine iron dichloride complex 7a (Figure 3) activated with MAO, initially reported for catalyzed chain growth (CCG) of ethene on Zn. 71,72 The addition of Et 2 Zn led to the molar mass decreasing and, a lower incorporation of norbornene (0.8−1.0 vs 1.6%, Table 2), while the overall catalytic activity was preserved.…”

Section: Mechanistic Studies and Extension Of Known Systemsmentioning

confidence: 99%

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Coordinative Chain Transfer and Chain Shuttling Polymerization

Mundil,

Bravo,

Merle

et al. 2023

Chem. Rev.

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Coordinative chain transfer polymerization, CCTP, is a degenerative chain transfer polymerization process that has a wide range of applications. It allows a highly controlled synthesis of polyolefins, stereoregular polydienes, and stereoregular polystyrene, including (stereo)block as well as statistical copolymers thereof. It also shows a green character by allowing catalyst economy during the synthesis of such polymers. CCTP notably allows the end functionalization of both the commodity and stereoregular specialty polymers aforementionned, control of the composition of statistical copolymers without adjusting the feed, and quantitative formation of 1-alkenes from ethene. A one-pot one-step synthesis of the original multiblock microstructures and architectures by chain shuttling polymerization (CSP) is also an asset of CCTP. This methodology takes advantage of the simultaneous presence of two catalysts of different selectivity toward comonomers that produce blocks of different composition/microstructure, while still allowing the chain transfer. This affords the production of highly performant functional polymers, such as thermoplastic elastomers and adhesives, among others. This approach has been extended to cyclic esters' and ethers' ring-opening polymerization, providing new types of multiblock microstructure. The present Review provides the state of the art in the field with a focus on the last 10 years.

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