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Ring-opening metathesis polymerisation

About: Ring-opening metathesis polymerisation is a research topic. Over the lifetime, 3479 publications have been published within this topic receiving 121231 citations. The topic is also known as: Ring-opening metathesis polymerization.


Papers
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DissertationDOI
01 Jan 2009
TL;DR: In this article, the synthesis and development of functionalized polymers using ring-opening metathesis polymerization (ROMP) is discussed, and the structure-property relationships of these materials are studied to better understand how polymer architecture affects polymer properties.
Abstract: The focus of the research presented in this thesis deals with the synthesis and development of functionalized polymers using ring-opening metathesis polymerization (ROMP). The approach taken in developing the polymers presented within, feature the careful design and synthesis of a number of functionalized and unique monomers. A basic history and overview of olefin metathesis and polymer science is given in Chapter 1. Chapters 2 and 3 describe the development of controlled polymer architectures for use as barrier materials. This work was done in collaboration with Kuraray, Inc, which is a major manufacturer of commercial barrier materials. Also the structure-property relationships of these materials were studied to better understand how polymer architecture affects polymer properties. Chapter 4 discusses the controlled living ROMP of highly strained trans-cyclooctene. The knowledge and understanding of solvent effects during ROMP was also explored as a means to attenuate the rate of propagation during ROMP. Block copolymers containing polynorbornene and PCO were also synthesized and hydrogenated to form block copolymers containing blocks of linear, narrowly dispersed polyethylene. Chapter 5 describes the development of photodegradable polymer. By incorporating photodegradable links into a polymer chain, using ROMP, the polymer chain may be degraded upon irradiation with light.
Patent
16 Apr 1997
TL;DR: An improved olefin metathesis catalyst system is described in this paper, which consists of a transition metal halide catalyst and an organo transition metal hydride co-catalyst of the formula Rx'-Cu-H.
Abstract: not available for EP0677074Abstract of corresponding document: US5316994An improved olefin metathesis catalyst system is disclosed. The catalyst system comprises a transition metal halide metathesis catalyst and an organo transition metal hydride co-catalyst of the formula Rx'-Cu-H The copper hydride co-catalyst of this invention has the general formula Rx'-Cu-H wherein R' is a complexing ligand preferably an organically substituted phosphine, and x is 1 or 2. The organic substituents on the phosphine group are optionally substituted C1-20 hydrocarbons, such as C1-20 alkyls or alkenyls, C3-20 cycloalkyls or cycloalkenyls having 3 to 8 carbon atoms in the ring, or optionally substituted C6-20 aryl or fused aryl. The optional substituents on the hydrocarbons include halogens, preferably chloride and fluoride; C1-6 alkyl; C1-6 alkenyl; or C1-6 alkoxy. The co-catalysts of this invention are combined with molybdenum, tungsten, or tantalum metathesis catalysts to provide an active catalytic system for the polymerization of cycloolefins, particularly dicyclopentadiene.
Posted ContentDOI
05 Apr 2017
TL;DR: In this article, the second-generation Grubbs catalyst (G2) was used in experiments at 20 and 50 oC for 24 and 48h, respectively, with the latter also being investigated in the presence or absence of SnCl2 as co-catalyst.
Abstract: Olefin metathesis of ethyl linoleate (EL) was investigated under different conditions of substrate amount, temperature, and catalyst. Second-generation Grubbs catalyst (G2) was used in experiments at 20 and 50 oC for 24 and 48h, whereas first-generation Grubbs catalyst (G1) and [RuCl2(PPh3)2perhydroazepine] (LN) were used in experiments at 50 oC for 24h, with the latter also being investigated in the presence or absence of SnCl2 as co-catalyst. Catalytic products were analyzed for GC-MS and discussed in terms of relative percent of the metathesis products. With G2 as catalyst, GC-MS chromatograms were similar in all the amounts of EL investigated at 50 oC for 24h, except for ethyl hexadec-9-enoate (compound K), which was obtained with different percentage as a function of EL amount (55% for 2 and 5 mL and 65% for 8 mL). An α,ω-dicarboxylic acid with m/z = 444.00 (compound L) was produced from the experiments at 50 oC for 24h with similar percentage as a function of EL amount. However, the relative percentage of L changed with the increase of EL volume in the experiments at 20 oC (ca. 18, 27, and 28%, with 2, 5, and 8 mL of EL, respectively). The olefin metathesis of EL conducted by G1 reached lower selectivity than that conducted by G2 for 24h at 50 oC. Several intense peaks reached with G1 were similar to those obtained with G2, in addition to new peaks of medium intensity. Compound L showed higher m/z, similar to that presented with G2, but with lower relative proportion in the mixture. LN was inert for olefin metathesis of EL; however, it was activated in the presence of SnCl2 at 50 oC for 24h. Different compounds and selectivity as a function of the catalyst type and reaction conditions were obtained.
Journal ArticleDOI
TL;DR: In this paper, a ring-opening metathesis polymerization (ROMP) of two monomers using Grubbs II catalyst as an initiator was used to synthesize all-optical photorefractive (PR) polymers.
Abstract: Abstract Non-conjugated multi-functionalized all-optical photorefractive (PR) polymers were designed and synthesized via ring-opening metathesis polymerization (ROMP) of two monomers using Grubbs II catalyst as an initiator. The polymers were characterized by infrared (IR) spectrum, gel permeation chromatography (GPC), UV-visible spectrum (UV-Vis), differential scanning calorimetry (DSC), thermogravimetry (TG) and so on. The number-average molar mass (M n) of the polymers is no less than 8.5 × 104 while their glass transition temperatures of 52°C and 45°C are close to the room temperature, which is helpful to the enhancement of PR orientation and the fabrication of PR devices. The polymers have good thermal stability and great solubility in tetrahydrofuran (THF). Without any plasticizer, the transparent optical films can be prepared by solution-casting with THF solution of polymers. Their PR properties at 633 nm were evaluated by two beam coupling (TBC) experiments under zero electric field without prepoling. It is shown that the single-component polymer has obvious all-optical PR behavior.
Patent
30 Jul 2020
TL;DR: Group Transfer Polymerization (GTP) as mentioned in this paper is a group transfer polymerization technique for brush polymers that uses two separate catalysts for the first and second stages.
Abstract: The present invention provides efficient processes for preparing brush polymers. In general, the process comprises three distinct reaction steps utilizing two separate catalysts. In the first step, the initiating compound comprising norbornene is contacted with a silane in the presence of a catalyst, thereby forming a silated intermediate. This silated intermediate is then contacted with a monomer in the presence of a catalyst via Group Transfer Polymerization (GTP). The resulting compound from GTP is contacted with a ring opening metathesis polymerization (ROMP) catalyst to prepare the brush polymer. Surprisingly, the brush polymers obtained from the above process are accessed in an efficient and rapid GTP methodology as compared to prior methods.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202328
202270
202160
202069
201971
201864