Synthesis of linear and star poly(ε-caprolactone) with controlled and high molecular weightsviacyclic trimeric phosphazene base catalyzed ring-opening polymerization

Abstract

Linear and star PCLs with controlled and high molecular weights are efficiently prepared by a catalytic system of CTPB/alcohol.

Facile Preparation of Stereoblock PLA From Ring-Opening Polymerization of rac-Lactide by a Synergetic Binary Catalytic System Containing Ureas and Alkoxides

“…Dimeric phosphazene with 1-pyrenebutanol as initiator produced PLAs with a P i of 0.72 at 20°C and a P i of 0.95 at −75°C, but the activity tremendously decreased to 1/50 (Zhang et al, 2007 ). Recently, we developed a new type of organic phosphazene base ( CTPB ) (Li et al, 2017 ; Zhao et al, 2017 ) and catalyzed ROP of rac -LA at −75°C with high stereoselectivity ( P i = 0.93) (Liu et al, 2018 ). In our current case, the increased isotacticity up to 0.93 was observed along with decreasing temperature (Table 1 , runs 3 and 5–7).…”

Ultrafast ring-opening copolymerization of lactide with glycolide toward random poly(lactic-co-glycolic acid) copolymers by an organophosphazene base and urea binary catalysts

“…The unexpected result was probably ascribed to the bulkier molecular size of CTPB compared to t -BuP 2 , which is also consistent with our previous studies that CTPB exhibited higher catalytic activities over the ROP of lactones and lactide. 26,38,39…”

Organoselenium chemistry-based polymer synthesis

“…In recent years, because of its high efficiency, ring-opening polymerization has become a prominent research area. [65][66][67][68][69][70] In particular, the method is used in the synthesis of polyester materials, including β-butyrolactone, γ-butyrolactone, ε-capro-lactone, etc. 71,72 Accordingly, some selenium-containing polymers were also prepared in this way with Se monomers.…”