Wagener " Acyclic Diene Metathesis Polymerization" in , A.-D.

Wagener, "Functionality Dependent Olefin Activity in Acyclic Diene Metathesis Polymerization: Mass Spectrometry Characterization of Amino Acid Functionalized Olefins" Analytical Chemistry , 78, 3624-3631 (2006).

Copolymers via Acyclic Diene Metathesis Polymerization and Living ..

Ring-Opening Metathesis Polymerization by Molybdenum Imido Alkylidene Complexes-- R.R.

Acyclic diene metathesis polymerization: History, …

Another method of achieving the desired molecular weight is byaddition of a small amount of monofunctional monomer, a monomerwith only one functional group. The monofunctional monomer, oftenreferred to as a chain stopper, controls and limits thepolymerization of bifunctional monomers because the growing polymeryields chain ends devoid of functional groups and thereforeincapable of further reaction.

Acyclic Diene Metathesis (ADMET) Polymerization

A more general functionality factor fav is definedfor multi-chain polymerization, as the average number of functionalgroups present per monomer unit. For a system containingN0 molecules initially and equivalent numbers of twofunction groups A and B, the total number of functional groups isN0fav.

Initiation, Propagation and Termination of Olefin Metathesis Reactions-- L.

Ring-opening polymerization; Acyclic diene metathesis; ..

The distinction between "step-growth polymerization" and"chain-growth polymerization" was introduced by in , and refers to the , respectively:

Living ring-opening metathesis polymerization ..

A monomer with functionality 3 will introducebranching in a polymer and will ultimately form amacrostructure or network even at low fractional conversion. Thepoint at which this three-dimensional structure is formed is knownas the becauseit is signalled by an abrupt change in . One of the earliest so-called is known as . It is not always water that isreleased in step-growth polymerization: in orADMET dienes polymerize with loss of .

Triptycene-Containing Polyetherolefins Via Acyclic Diene Metathesis Polymerization Stefanie A.

Acyclic Diene Metathesis Polymerization

The driving force in designing new polymers is the prospect ofreplacing other materials of construction especially metals usinglightweight and heat-resistant polymers. The advantages oflightweight polymers include: high strength, solvent and chemicalresistance, contributing to a variety of potential uses, such aselectrical and engine parts on automotive and aircraft components,coatings on cookware, coating and circuit boards for electronic andmicroelectronic devices, etc. Polymer chains based on aromaticrings are desirable due to high bond strengths and rigid polymerchains. High molecular weight and crosslinking are desirable forthe same reason. Strong dipole-dipole, hydrogen bond interactionsand also improve heatresistance. To obtain desired mechanical strength, sufficientlyhigh molecular weights are necessary, however, decreased solubilityis a problem. One approach to solve this problem is to introduce ofsome flexibilizing linkages such as isopropylidene, C=O, and SO2into the rigid polymer chain by using an appropriate monomer orcomonomer. Another approach involves the synthesis of reactivetelechelic oligomers containing functional end groups capable ofreacting with each other, polymerization of the oligomer giveshigher molecular weight, referred to as chain extension.

"Triptycene-Containing Polyetherolefins via Acyclic Diene Metathesis Polymerization" J.

metathesis polymerization, acyclic diene ..

Wagener, "Functionalized Polyethylene via Acyclic Diene Metathesis Polymerization: Effect of Precise Placement of Functional Groups", , 33, 8963-8970 (2000).

Wagener, "Ethylene/Vinyl Acetate Copolymers via Acyclic Diene Metathesis Polymerization.

Ring-opening metathesis polymerization ..

Several new triptycene-containing polyetherolefins were synthesized via acyclic diene metathesis (ADMET) polymerization. The well-established mechanism, high selectivity and specificity, mild reaction conditions, and well-defined end-groups make the ADMET polymerization a good choice for studying systematic variations in polymer structure. Two types of triptycene-based monomer with varying connectivities were used in the synthesis of homopolymers, block copolymers, and random copolymers. In this way, the influence of the triptycene architecture and concentration in the polymer backbone on the thermal behavior of the polymers was studied. Inclusion of increasing amounts of triptycene were found to increase the glass transition temperature, from 44 degrees C in polyoctenamer to 59 degrees C in one of the hydrogenated triptycene homopolymers (H-PT2). Varying the amounts and orientations of triptycene was found to increase the stiffness (H-PT1), toughness (PT11-b-PO1) and ductility (PT11-ran-PO3) of the polymer at room temperature. (c) 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013, 51, 1695-1706