What is ROMP in chemistry?
General Information. Ring Opening Metathesis Polymerization (ROMP), a term coined by CalTech chemist Robert Grubbs, is a variant of the olefin metathesis reaction. The reaction uses strained cyclic olefins to produce stereoregular and monodisperse polymers and co-polymers.
Is ROMP a living polymerization?
Given the right reaction conditions ring-opening metathesis polymerization (ROMP) can be rendered living.
Is ROMP step growth?
ROMP is thus a chain-growth polymerization and belongs, together with Ziegler-Natta-type polymerizations and group transfer polymerizations, to the family of polyinsertions. The mechanism is based on olefin metathesis.
What is ring opening metathesis reaction?
Ring opening metathesis polymerization (ROMP) is a process of one or more cyclic olefins transformation to polymer catalyzed by metal carbene compounds. Indeed, the number of double bonds both in polymer and in monomer is equal [1, 2, 3, 4].
What is meant by group transfer polymerization?
Group transfer polymerization (GTP) is an effective method for the synthesis of poly(methyl methacrylate) (pMMA) with controlled molecular weights and narrow polydispersities. Silyl ketene acetals initiate the polymerization of methyl methacrylate in the presence of either nucleophilic or Lewis acid catalysts.
How does Ziegler Natta catalyst work?
Mechanism Of Ziegler–Natta Catalyst Polymerisation usually takes place by insertion of monomers where the transition metal ions are attached to the end of the growing chain. The incoming monomers are simultaneously coordinated at vacant orbital sites, and there is a formation of long polymer chains.
Why anionic polymerization is called living polymerization?
Thus, since the propagating chain end maintains its reactivity and is still “living,” the resulting polymer and the polymerization system are called as “living polymer” and “living polymerization,” respectively.
How do you make norbornene?
Norbornene is made by a Diels–Alder reaction of cyclopentadiene and ethylene. Many substituted norbornenes can be prepared similarly. Related bicyclic compounds are norbornadiene, which has the same carbon skeleton but with two double bonds, and norbornane which is prepared by hydrogenation of norbornene.
What is cross metathesis reaction?
Cross-metathesis is synthetically equivalent to (and has replaced) a procedure of ozonolysis of an alkene to two ketone fragments followed by the reaction of one of them with a Wittig reagent.
What is main driving force of the ring-opening metathesis polymerization reaction?
Ring-opening metathesis polymerization (ROMP) is a type of olefin metathesis chain-growth polymerization. The driving force of the reaction is relief of ring strain in cyclic olefins (e.g. norbornene or cyclopentene). A variety of heterogeneous and homogeneous catalysts have been developed.
What is the structure of polymers?
Polymers have very large molecules . The atoms in a polymer molecule are joined together by strong covalent bonds in long chains. There are variable numbers of atoms in the chains of a given polymer. One example of a polymer is poly(ethene).
How do you achieve stereospecific polymerization using Ziegler-Natta catalyst?
The Cossee–Arlman mechanism describes the growth of stereospecific polymers. This mechanism states that the polymer grows through alkene coordination at a vacant site at the titanium atom, which is followed by insertion of the C=C bond into the Ti−C bond at the active center.
Why is romp so popular for polymerization?
Thus, ROMP has emerged as one of the most popular polymerization techniques due to its high functional group tolerance and the possibility of obtaining narrow dispersity polymers under mild reaction conditions and short reaction times. Fig. 1: Structure of the metathesis catalysts, CTAs and monomers investigated in this study.
What is ring-opening metathesis polymerization (ROMP)?
Ring-opening metathesis polymerization (ROMP) is a polymerization driven by the relief of the ring strain of cyclic olefins to form polymers 1.
Which monomers can be successfully polymerized under living catalytic ROMP conditions?
Furthermore, highly functional monomers carrying ferrocene, coumarin or a triisopropylsilyl-protected primary alcohol in the side chain were also successfully polymerized under living catalytic ROMP conditions.
Can a reversible chain-transfer agent be used to produce living romp polymers?
Here, a reversible chain-transfer agent was used to produce living ROMP polymers from norbornene derivatives using catalytic amounts of Grubbs’ ruthenium complexes.