Radical Polymerization in the Presence of Chain Transfer Monomer: An Approach to Branched Vinyl Polymers

Abstract

An approach to branched vinyl polymers through radical polymerization in the presence of 3mercaptohexyl methacrylate (MHM) as the chain transfer monomer is reported in this paper. In the case of polymerization at styrene 100 −MHM 5.0 −AIBN 2.0 , the molecular weight increased with conversion and reached a value of >7.3 × 10 5 g/mol at 99% conversion; in addition, the Zimm branching factor, g′, was less than 1 and decreased with conversion, when the formation of the branched chain and development of branching was supposed. The bridging units in the obtained polymer, generating from MHM, were cleaved to yield the primary chains. These results have confirmed the formation of branched polymers. Moreover, this study successful prepared branched poly(methyl methacrylate) and poly(vinyl acetate). This methodology proposes good prospects for scaling-up and thereby offers a wide range of branched vinyl polymers at low cost.

Applying Multidimensional Method of Moments for Modeling and Estimating Parameters for Arborescent Polyisobutylene Production in Batch Reactor

“…When the chloride group is removed by a Lewis acid (LA), a tertiary carbocation forms that can initiate polymerization. In recent years, a variety of polymers have been produced by copolymerizing IMs with other vinyl monomers, resulting in self‐condensing vinyl copolymerization (SCVCP). Materials produced by SCVP and SCVCP tend to be arborescent (tree‐like) in structure because the IM units lead to T‐shaped branch points.…”

“…Materials produced by SCVP and SCVCP tend to be arborescent (tree‐like) in structure because the IM units lead to T‐shaped branch points. These new polymers often have relatively low molecular weight . However, Puskas et al copolymerized IM and isobutylene to produce polymers with high molecular weight (>100 000 g mol −1 ) …”

Influence of solvent on branching via atom transfer radical polymerisation using 1,6-bismaleimidohexane as branching agent

“…The lower value of g' indicates higher branching degree of polymer. 23,24 In the two reaction systems, the values of g' were lower than one and decreased with increasing molecular weight, demonstrating the formation of branched structure and the development of branching. The average g' of the anisole with NMP system was always lower than that of the anisole alone system at the same molecular weight, indicating that the branched structure of the anisole with NMP system was formed 2 Relationships of molecular weight and PDI with styrene conversion for copolymerisation of styrene and BMIH initiated by t-BBiB in different solvents at 80uC rapidly than that in the anisole system and the former system has higher branching degree compared with that in the latter system.…”

Ultrafast preparation of branched poly(methyl Acrylate) through single electron transfer living radical polymerization at room temperature

“…The weight fractions of the branched chain ( W br .) were obtained by splitting the SEC‐DRI curves using Gaussion function , Fig. shows the changes of W br.…”