Zhang, Yudi; Lund, Ethen; Gossweiler, Gregory R.; Lee, Bobin; Niu, Zhenbin; Khripin, Constantine; Munch, Etienne; Couty, Marc; Craig, Stephen L. published an article in 2021. The article was titled 《Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore》, and you may find the article in Macromolecular Rapid Communications.Category: chlorides-buliding-blocks The information in the text is summarized as follows:
Mol. force probes that generate optical responses to critical levels of mech. stress (mechanochromophores) are increasingly attractive tools for identifying mol. sites that are most prone to failure. Here, a coumarin dimer mechanophore whose mech. strength is comparable to that of the sulfur-sulfur bonds found in vulcanized rubbers is reported. It is further shown that the strain-induced scission of the coumarin dimer within the matrix of a particle-reinforced polybutadiene-based copolymer can be detected and quantified by fluorescence spectroscopy, when cylinders of the nanocomposite are subjected to unconstrained uniaxial stress. The extent of the scission suggests that the coumarin dimers are mol. “”weak links”” within the matrix, and, by analogy, sulfur bridges are likely to be the same in vulcanized rubbers. The mechanophore is embedded in polymer main chains, grafting agent, and crosslinker positions in a polymer composite in order to generate exptl. data to understand how macroscopic mech. stress is transferred at the mol. scale especially in highly entangled crosslinked polymer nanocomposite. Finally, the extent of activation is enhanced by approx. an order of magnitude by changing the regiochem. and stereochem. of the coumarin dimer and embedding the mechanophore at the heterointerface of the particle-reinforced elastomer. In the experimental materials used by the author, we found Benzylidenebis(tricyclohexylphosphine)dichlororuthenium(cas: 172222-30-9Category: chlorides-buliding-blocks)
Benzylidenebis(tricyclohexylphosphine)dichlororuthenium(cas: 172222-30-9) is the first metathesis catalyst to be widely used in organic synthesis. It is useful for acyclic diene metathesis polymerization (ADMET), Ring-Opening Metathesis Polymerization (ROMP) of strained cyclic olefins, ring opening metathesis (ROM), and so on.Category: chlorides-buliding-blocks
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics