Step‐Growth Polymerization

Synthesis of differentiated sulfur-containing polymers by regiodivergent polymerization of Morita–Baylis–Hillman acetates and thiols

“…Furthermore, an extended reaction time from 5 to 12 h effectively promoted the polymerization with a high M n of 18.9 kDa, suggesting the step-growth characteristics of these polymerizations. 10 As such, further extending the reaction time could still improve the M n , but slightly (Table 1, entries 4–6). Considering the polymerization results and time cost, we adopted 12 h as the reaction time for further research.…”

Mathematical modelling of the reaction of condensation telomerization and the investigation of the model

“…This means that the equilibrium constants for processes of the same type can be considered identical. It is believed that polymers are present in the equilibrium state according to the polymerization degree from 1 to ∞ [3,8]. Equation 1only roughly conveys the composition of the products, because condensation telomerization, as a polycondensation process, proceeds statistically [3,7].…”

“…It is believed that polymers are present in the equilibrium state according to the polymerization degree from 1 to ∞ [3,8]. Equation 1only roughly conveys the composition of the products, because condensation telomerization, as a polycondensation process, proceeds statistically [3,7]. If to consider the interaction of only monomer substances, it is possible to distinguish the following basic linearly independent reactions: In (2) the equilibrium constants K 1 and K 2 are associated, respectively, with the processes of growth and chain termination.…”

“…Process (1) should be considered as an equilibrium polycondensation with an open circuit. Despite the fact that the theory of polycondensation processes is well developed [2][3][4][5][6][7], mathematical models of equilibrium condensation telomerization processes are still lacking. Development of such models is an urgent task, since its presence will allow a more focused approach to the selection of optimal conditions for the synthesis of compounds with a given composition (polymerization degree).…”

Organocatalytic synthesis of poly(hydroxymethylfuroate) via ring-opening polymerization of 5-hydroxymethylfurfural-based cyclic oligoesters

“…2 Common methods for the synthesis of PEs include the step-growth polymerization of hydroxy acids or diol/diacid pairs, and the ring-opening polymerization (ROP) of lactones. 3 Among bio-based PEs, 4 polyfuranoates are of particular interest as sustainable alternatives to industrial PEs derived from terephthalic acid such as poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT). 5 Indeed, poly(ethylene furanoate) (PEF) and poly(butylene furanoate) (PBF) are going to be produced on a large scale due to their favorable mechanical and barrier properties, recyclability, and integration within the context of a circular economy.…”