Results 201 to 210 of about 17,166 (245)

Catalytic Olefin Polymerization

1984
Table 1 gives the world production data regarding polyolefins and their copolymers as well as those concerning the other main plastics. As may be inferred from such data, the polyethylenes obtained via catalytic processes and polypropylenes (homopolymers and modified products) rank fourth and fifth in terms of quantities produced.
I. Pasquon, U. Giannini
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Degradable polymers via olefin metathesis polymerization

Progress in Polymer Science, 2021
The development of degradable polymers has commanded significant attention over the past half century. Approaches have predominantly relied on ring-opening polymerization of cyclic esters (e.g., lactones, lactides) and N-carboxyanhydrides, as well as radical ring-opening polymerizations of cyclic ketene acetals.
Hao, Sun, Yifei, Liang, Matthew P, Thompson, Nathan C, Gianneschi   +3 more
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Living Cationic Olefin Polymerization

1987
Recently we have discovered that various tertiary ester and ether boron trichloride complexes induce truly living polymerization of isobutylene, 1,3,5-trimethylstyrene and copolymerization of isobutylene/ isoprene in CH3C1 and CH2C12 diluents over a wide range of temperatures (i.e., from 0° to -70°C).
J. P. Kennedy, R. Faust, M. K. Mishra, A. Fehervari   +3 more
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Olefin Polymerization Catalysts

2011
Catalytic polymerization processes have become increasingly important as the use of plastics has escalated throughout the world. Many common plastics were discovered in the 1930s, and after the 1939–1945 war this created a demand for petrochemical intermediates derived from the refining industry.
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Olefin Polymerization Catalysis Technology

Catalysis Reviews, 1984
Abstract In the mid-1950s a series of patents on a new ethylene polymer was issued. These patents were all similar in that solid catalysts were used to produce polyethylene at relatively low ethylene pressures (Table 1). In contrast to the high pressure process which produced highly branched polymers with densities of 0.910 to 0.930 g/cm3, the new ...
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Hafnocene-Based Olefin Polymerizations

2008
Zirconocenes have been used for a long time in the field of olefin polymerization using MAO as cocatalyst. The equivalent hafnocenes were seldom used due to a lack of productivity while using MAO activation. In the last few years borane and borate activation has come into the focus of research for olefin polymerization.
T. Diesner, C. Troll, B. Rieger
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Scope of Olefin Polymerization Nickel Catalysts

Science, 2000
In their report “Neutral single-component nickel (II) catalysts that tolerate heteroatoms” (21 Jan., p. 460), T. R. Younkin et al. describe the development of a family of polymerization catalysts that are tolerant of many functional groups and low-purity starting materials.
Ostoja Starzewski, K. Aleksander, Younkin, Todd R., Connor, Eric F., Henderson, Jason I., Friedrich, Stefan K., Grubbs, Robert H., Bansleben, Donald A.   +6 more
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Olefin oligomerization and polymerization

2001
This chapter describes the polymerization of olefins, which is the main industrial use of organometallic catalysts. It looks first at polyketones, which can be produced by the co-polymerization of olefins with carbon monoxide. Polyketones are of particular interest as specialty polymers in the context of their superior material performance properties ...
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5627117 Olefin polymerization catalyst and process for olefin polymerization

Journal of Molecular Catalysis A: Chemical, 1997
Teruak Mukaiyama, Makoto Mitani, Kunihiro Oouchi   +2 more
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Carbonyl–Olefin Metathesis

Chemical Reviews, 2021
Ashlee J Davis, Jessica L Gomez-Lopez, Hannah L Vonesh   +2 more
exaly