Yu, Xiaowang published the artcilePolycondensation in confined nanopores toward the selective formation of narrowly dispersed linear polyesters, Related Products of alcohols-buliding-blocks, the publication is Polymer Chemistry (2022), 13(28), 4136-4143, database is CAplus.
The synthesis of linear polymers with both ends conserved is severely impeded due to the inevitable macrocyclization in step-growth polymerization (SGP). Indeed, macrocyclic polymers are considered as the ultimate destination of polycondensations for AB or A2 + B2 monomer combinations. Here, we present a new strategy to limit the macrocyclization process towards the selective formation of linear polyesters in the polycondensations of ω-hydroxyaliph. acid and the combinations of dicarboxylic acids and diols. By embedding the catalyst (sulfonic acid) in dendritic mesoporous silica nanoparticles (DMSNs), the polyesterifications were ushered to exclusively take place in the confined nanopores of DMSNs. The distribution of the α,ω-ends in different positions in the bundle of polyesters limited the end-to-end cyclization, leading to the selective chain extension especially in the high mol. weight region. NMR, GPC and MALDI-TOF results show that while the polyesters obtained in homogeneous polycondensation or with a nonporous heterogeneous catalyst were mainly with cyclic structures, the selective formation of linear polyesters was found in the confined nanopores of DMSNs. This finding contradicts the general sense that confined geometries are in favor of macrocyclization and provides a new understanding to manipulate the polymerization process towards the control of cyclic and linear topologies.
Polymer Chemistry published new progress about 111-29-5. 111-29-5 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ploymers, name is Pentane-1,5-diol, and the molecular formula is C6H13NO2, Related Products of alcohols-buliding-blocks.
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