Ring-opening metathesis polymerization (ROMP) produces unsaturated polymers from cycloalkenes or bicycloalkenes. It requires organometallic catalysts. The mechanism for ROMP follows similar pathways as olefin metathesis.
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What is produced by ring-opening polymerization?
Ring-opening metathesis polymerization (ROMP) produces unsaturated polymers from cycloalkenes or bicycloalkenes. It requires organometallic catalysts. The mechanism for ROMP follows similar pathways as olefin metathesis.
Which compounds undergo ring-opening polymerization?
The cyclic monomer structures that can be used for ring-opening polymerization include alkanes, alkenes, and compounds containing heteroatoms from different groups, for example, the sulfur family (polysulfur, sulfides, etc.), the nitrogen family (amines, amides, imides, etc.), the oxygen family (acetals, ethers, esters …
What is ring-opening polymerization of caprolactam?
The ring-opening polymerization of caprolactam is more complex; the proposed mechanism involves the abstraction of an acidic H-N proton from the caprolactam in the presence of a strong base. The activated monomer anion then attacks another lactam molecule to induce ring-opening.
What is anionic ring-opening polymerization?
Anionic ring-opening polymerization is a kind of chain growth polymerization where the initiation and propagation steps accompany ring-opening reaction of cyclic monomers induced by nucleo- philic addition of anionic initiator and anionic chain end, respectively.
What is a ring-opening reaction?
Ring-opening reactions of epoxides by a halide ion are important transformations that afford a 1,2-halohydrin system with two successive chiral carbon centers. The obtained products may be converted to various functional groups (Figure 1) and used as synthetic intermediates for natural products and pharmaceuticals.
What is the importance of ring-opening polymerization?
The ring-opening polymerization has been used in the polymerization of commercial important polymers such as curing of epoxy resin from 3-membered ring cyclic ethers (epoxides), polyesters from cyclic ester (lactones), polyamides from cyclic amides (lactams), polysiloxanes from cyclic siloxanes, and so on.
Which is an example of ring-opening polymerization?
Some examples of cyclic monomers that polymerize through anionic or cationic ring-opening polymerization include cyclic ethers, lactones, lactams, carbonates, aziridines, and epoxides. Ring-opening polymerization can also proceed via free radical polymerization.
Where is ring-opening polymerization used commercially?
What is the monomer of nylon 6 polymer?
It, and nylon 6, are the two most common for textile and plastic industries. Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name….Nylon 66.
| Names | |
|---|---|
| ChemSpider | None |
| ECHA InfoCard | 100.130.739 |
| PubChem CID | 3032893 |
| CompTox Dashboard ( EPA ) | DTXSID6027973 |
What is radical ring-opening polymerization?
Free-radical ring-opening polymerization is a kind of chain-growth polymerizations where the free radical at the propagating chain end reacts with the radical-accepting cite of cyclic monomer, and this reaction is followed by the ring-opening reaction of the cyclic structure.
Is ring-opening exothermic or endothermic?
exothermically
ROP proceeds (mostly) exothermically, because cyclic monomers are usually strained species.