Effect of organophosphorus complexing agents of the double metal cyanide catalysts on the ring-opening polymerizations of epoxide and lactones Lee Eungyeong and Il Kim Pusan National University, South Korea Double metal cyanide (DMC) materials are well-known catalyst for the polymerization of epoxides and propylene oxide (PO) for polyether polyols used in a wide range of polyurethane applications and copolymerizations with CO 2 . Due to pure DMC are too stable to be used as catalysts, organic complexing agents (CAs) play an important role to generate active species [1−2]. Organophosphorus compounds are highly versatile, biodegradable and environmentally friendly. They have been used as ligands in organometallic chemistry as well as catalysts for ring-opening polymerization of lactones [3−5]. In this context, we attempt to employ these organophosphorus compounds as CAs for the complexation of DMC catalysts (Figure 1(a)). The complexation structure of CA onto the catalyst matrix were determined using general techniques such as infrared, nuclear magnetic resonance, and X-ray photoelectron spectroscopies. The resultant DMC catalysts showed high activity in the ring-opening polymerization of PO and ε-caprolactone (CL), and copolymerization of PO with CO 2 (Figure 1(b−c)).
Figure 1. Structure of the DMC catalyst bearing various organophosphorus CAs (a), and catalytic activities for the ROP of propylene oxide (b) and for copolymerization of propylene oxide with CO 2 (c).
Table 1. Summary of the polymerization results.
Catalyst ROP of PO ROP of CL Copolymerization of PO
with CO 2 TOF a (min −1 ) M n b
(g mol −1 ) Ð c TOF (h −1 )
Yield of PPC d (%) S CO 2 e (%)
TBC
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