Tailor-made chalcogen-rich polycarbonates: experimental and computational insights into chalcogen group-dependent ring opening polymerization was written by Wei, Chao;Lian, Cheng;Yan, Bingkun;Xiao, Yan;Lang, Meidong;Liu, Honglai. And the article was included in Polymer Chemistry in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:
The critical role of abundant chalcogens (with variable types and valences) located in polymer backbones on the properties, functions and bioactivities of final materials underscores the pressing need for versatile and controlled synthetic platforms towards chalcogen-rich polymers. Herein, we reported a universal and robust approach to generate a poly(chalcogen-carbonate) library using com. available organic base-catalyzed ring opening polymerization (ROP) of macrocarbonates containing chalcogen groups. Polymerizations have unique advantages including high control, fast kinetics, mild reaction conditions at room temperature and compatible operation for different monomers. Furthermore, ROP depends sensitively on chalcogen groups, where thioether (-S-), selenide (-Se-) and disulfide (-SS-)-substituted monomers polymerize readily, while the diselenide (-SeSe-) substituted one is difficult to polymerize. A d. functional theory (DFT)-combined exptl. study provided abundant mechanism insights and illuminated the structure/composition-kinetic relationships to rationalize the observed polymerization trends. Polymerization kinetics was gradually suppressed with chalcogen groups evolving from -S-, -Se-, -SS- to -SeSe-, which may offer a powerful support to forecast the polymerization behaviors of other chalcogen-based monomers. This work not only describes a convenient and efficient strategy for chalcogen-rich polymeric materials, but also provides important insights for understanding the influence of chalcogen groups on polymerization behaviors. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Category: esters-buliding-blocks).
Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics