Ring Opening Metathesis Polymerization Review

Ring Opening Metathesis Polymerization Review-45
The mesophase type and the thermal transition temperatures are influenced not only by the attached mesogenic moiety but also by the stiffness of the polymer backbone, the spacer lengths between the main chain and the liquid crystalline entity, the isomerism, the tacticity, and so on.In addition, the use of acyclic diene metathesis polymerization (ADMET) or alternating diene metathesis polycondensation (ALTMET) offer new possibilities for creating new main chain liquid crystalline polymers (MCLCPs).Ring opening metathesis polymerization (ROMP) is a versatile tool for preparing side chain liquid crystalline polymers (SCLCPs) with different mesogenic units.

The mesophase type and the thermal transition temperatures are influenced not only by the attached mesogenic moiety but also by the stiffness of the polymer backbone, the spacer lengths between the main chain and the liquid crystalline entity, the isomerism, the tacticity, and so on.In addition, the use of acyclic diene metathesis polymerization (ADMET) or alternating diene metathesis polycondensation (ALTMET) offer new possibilities for creating new main chain liquid crystalline polymers (MCLCPs).Ring opening metathesis polymerization (ROMP) is a versatile tool for preparing side chain liquid crystalline polymers (SCLCPs) with different mesogenic units.

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Many strained cycloalkenes, e.g norbornene, are suitable monomers via ring-opening metathesis polymerization.

Ring-opening polymerization has been used since the beginning of the 1900s to produce polymers.

Mechanisms and thermodynamics of ring-opening polymerization were established in the 1950s.

Additionally, radical ROP is useful in producing polymers with functional groups incorporated in the backbone chain that cannot otherwise be synthesized via conventional chain-growth polymerization of vinyl monomers.

Some cyclic monomers such as norbornene or cyclooctadiene can be polymerized to high molecular weight polymers by using metal catalysts.

ROP is a versatile method for the synthesis of biopolymers.

Monomers with a three-member ring structure - such as epoxide, aziridine, and episulfide - undergo anionic ROP.

Cationic initiators and intermediates characterize cationic ring-opening polymerization (CROP).

For example, if the atom bearing the positive charge is stabilized by electron-donating groups, polymerization will proceed by the S When the amount of monomers becomes depleted, termination can occur intra or intermolecularly.

The active end can "backbite" the chain, forming a macrocycle.

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