Fuchise, Keita published the artcileOrganocatalytic ring-opening polymerization of cyclotrisiloxanes using silanols as initiators for the precise synthesis of asymmetric linear polysiloxanes, Synthetic Route of 597-52-4, the publication is Polymer Chemistry (2020), 11(48), 7625-7636, database is CAplus.
The organo-catalytic controlled/living ring-opening polymerization (ROP) of cyclotrisiloxanes such as hexamethylcyclotrisiloxane (D3) and 1,3,5-trimethyl-1,3,5-trivinylcyclotrisiloxane (V3) using silanol initiators and guanidine catalysts produced various asym. linear poly(dimethylsiloxane) (PDMS) and poly[methyl(vinyl)siloxane] (PMVS) compounds with controlled number-average molar mass (Mn), narrow molar-mass dispersity, and well-defined terminal structures. An extensive range of solvents and catalysts were tested in order to optimize the conditions for the ROP of D3 and V3 as well as to minimize undesired side-reactions, particularly the condensation of two Si-OH groups. 1,3-Trimethylene-2-n-propylguanidine (TMnPG) and 1,3-trimethylene-2-ethylguanidine (TMEG) were identified as the most appropriate catalysts for the ROP of D3 and V3. Asym. linear polysiloxanes that contain either a functional group on one terminus, i.e., hemi-telechelic polysiloxanes, or two different functional groups on each terminus, i.e., heterotelechelic polysiloxanes, were conveniently obtained from choosing a suitable combination of a functionalized silanol initiator and a functionalized chlorosilane end-capping agent. The controlled synthesis of a PDMS/PMVS diblock copolymer was also achieved by consecutive copolymerizations of D3 and V3. These polymerizations are considered to proceed via the initiator/chain-end activation mechanism, and intensive removal of water from the starting materials is necessary to control the polymerizations
Polymer Chemistry published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, Synthetic Route of 597-52-4.
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