《Synthesis and Characterization of Rigid-Rod Polymers with Silsesquioxanes in the Main Chain》 was written by Guan, Jun; Zhang, Zijing; Laine, Richard M.. Application of 172222-30-9This research focused onvinyl silsesquioxane main chain metathesis photopolymerization. The article conveys some information:
Two double-decker silsesquioxane-based rigid-rod polymers/oligomers were synthesized using olefin self-metathesis and photolysis. In both synthetic routes, double-decker (DD) silsesquioxanes (SQs) with di- and tetra-vinyl functionalities were studied, and all products were characterized in detail by NMR (NMR), MALDI-TOF, GPC, TGA, and Fourier transform IR (FTIR) spectroscopy. The catalytic self-metathesis of di-vinyl-functionalized DD SQs results in rigid-rod oligomers with a simple ethene bridge linking SQ cages with a decomposition temperature Td5% of ~530° C in air. Due to steric hindrance, only one ethene bridge forms between tetra-vinyl-functionalized DD SQs using either Grubb’s 1st or 2nd generation catalysts, with other vinyl groups remaining unreacted, as indicated by MALDI-TOF. As an alternative approach, photolysis of di-vinylDD SQs in the UVA and UVB regions leads to linear polymers with cyclobutane linkers between SQ cages and a Td5% of ~530° C. In both configurations, the degrees of freedom are limited solely to rotation around the single bonds joining the ethene or cyclobutane groups to the DD SQs along the chain axis, leading to rigid-rod polymers. Rigid-rod polymers remain both highly thermally stable and soluble in common solvents such as dichloromethane and THF, which points to new opportunities in easily processable rigid-rod polymers. In contrast, photolysis of tetra-vinylDD SQs leads to insoluble and unmeltable products, implying a high degree of crosslinking. The results came from multiple reactions, including the reaction of Benzylidenebis(tricyclohexylphosphine)dichlororuthenium(cas: 172222-30-9Application of 172222-30-9)
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.Application of 172222-30-9
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics