Epoxide Polymerization and Copolymerization with Carbon Dioxide Using Diethylaluminum Chloride-25,27-Dimethoxy-26,28-dihydroxy-p-tert-butyl-Calix[4]arene System as a New Homogeneous Catalyst

Copolymerization of carbon dioxide and epoxide

“…38 Propylene oxide or cyclohexene oxide was copolymerized with carbon dioxide (yield with respect to epoxide: 38% in 168 h and 26% in 264 h, respectively) at 35°C under 60 atm of carbon dioxide pressure. The average molecular weights of the polycarbonates obtained were not very high (M n ϭ 5620 and 1930, respectively), and the carbon dioxide contents of the copolymers were fairly low (13 and 18%, respectively).…”

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“…Table 4 also illustrates that molecular weight and melting point of polyethylenes prepared by C 6 Nd or C 8 Nd 2 system are around 90 × 10 4 and 134°C, respectively. Table 5 lists the results of ethylene polymerization with various rare earth calix [4]arene and calix [6]arene complexes (Ln = La, Sm, Nd, Dy and Y). Although rare earth elements are very similar in chemical properties, their catalytic activities in the ethylene polymerization are quite different.…”

“…A few papers have reported that metal calixarene complexes used as polymerization catalysts, such as a Cl-containing titanium p-tert-butylcalixarene/methylaluminoxane system for ethylene polymerization [5] , a Cl-containing aluminum p-tert-butylcalix [4]arene system for propylene oxide polymerization [6] , and a [p-tBuCalix [4]-(OMe) 2 -(O) 2 Zr(CH 2 Ph)] + BPh 4 − compound for tetrahydrofuran (THF) polymerization [7] .…”

Effect of polymerization conditions on the polymer properties of CO2-cyclohexene oxide copolymer prepared by double metal cyanide catalyst

“…Since 1990s, there have been active development efforts for obtaining high efficient catalysts with a variety of central metals. There have been also efforts to expand a variety of monomer from propylene oxide (PO) to other aliphatic epoxide, such as cyclohexene oxide (CHO) [5][6][7][8][9][10][11][12]. Double metal cyanide (DMC) has been reported to synthesize polyether polyol on the basis of epoxide homo-polymerization, such as propylene oxide [13].…”