Poly（9-phenyl-2,4,8,10-tetraoxaspiro-[5,5]undcane-3-one） （PPTC） was synthesized by the microwave-assisted ring-opening polymerization （MROP） of a six-membered cyclic carbonate monomer 9-phenyl-2,4,8,10-tetraoxas...Poly（9-phenyl-2,4,8,10-tetraoxaspiro-[5,5]undcane-3-one） （PPTC） was synthesized by the microwave-assisted ring-opening polymerization （MROP） of a six-membered cyclic carbonate monomer 9-phenyl-2,4,8,10-tetraoxaspiro- [5,5]undcane-3-one （PTC） with tin（Ⅱ） 2-ethylhexanoate （Sn（Oct）2） or aluminum isopropoxide （Al（OiPr）3） as the catalysts. The obtained polycarbonates were further reduced by apalladium/carbonate catalyst （10% Pd/C） to afford partly deprotected polycarbonates containing hydroxyl groups （HPPTC）. These two types of polycarbonates were characterized by ^1H-NMR, Fourier transform infrared spectroscopy （FTIR）, UV, gel permeation chromatography （GPC）, differential scanning calorimetry （DSC）, and automatic contact-angle measurements. The influence of the feed molar ratio of monomer-to-catalyst, the microwave irradiation power and the reaction time on the polymerization was also studied. The experimental results showed that HPPTC possessed significantly higher hydrophilicity and water absorption rate than PPTC.展开更多
Two kinds of cyclic aryl ester dimers have been synthesized by reaction of phthaloyl dichloride with bisphenols via interfacial polycondensation. The cyclic dimers readily undergo anionic ring-opening polymerization o...Two kinds of cyclic aryl ester dimers have been synthesized by reaction of phthaloyl dichloride with bisphenols via interfacial polycondensation. The cyclic dimers readily undergo anionic ring-opening polymerization or copolymerization in the melt by using sodium benzoate as the initiator, producing linear, high molecular weight polyesters. The contents of cyclic dimers in the homopolymers P1, P2, and copolymer P12 are 13.7%, 10.2%, 2.9%, respectively, which indicates that ring-opening copolymerization of cyclic dimers may impel the conversion of cyclic dimers and decrease the content of cyclic dimers in the resulting copolymer. Moreover, the isothermal chemorheology of the ring-opening copolymeriza- tion of cyclic dimers indicates that the reactive molten mixture has low shear viscosity and the viscosity increases slowly in the initial stage of ring-opening polymerization.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51373128 and 51173140)Key National Research and Development Program(No.2016YFB1101302)+4 种基金Wuhan Science and Technology Innovation Team of Hi-tech Industrial Project,Hubei Province(No.2015070504020217)Wuhan Scientific and Technological Project(No.2013010501010131)University Students’ President Funded Project,Wuhan Institute of Technology(No.2015004)“E+” double-major programInnovation Fund for post-graduate education(Nos.CX2014058 and CX2015007),Wuhan Institute of Technology,China
文摘Poly（9-phenyl-2,4,8,10-tetraoxaspiro-[5,5]undcane-3-one） （PPTC） was synthesized by the microwave-assisted ring-opening polymerization （MROP） of a six-membered cyclic carbonate monomer 9-phenyl-2,4,8,10-tetraoxaspiro- [5,5]undcane-3-one （PTC） with tin（Ⅱ） 2-ethylhexanoate （Sn（Oct）2） or aluminum isopropoxide （Al（OiPr）3） as the catalysts. The obtained polycarbonates were further reduced by apalladium/carbonate catalyst （10% Pd/C） to afford partly deprotected polycarbonates containing hydroxyl groups （HPPTC）. These two types of polycarbonates were characterized by ^1H-NMR, Fourier transform infrared spectroscopy （FTIR）, UV, gel permeation chromatography （GPC）, differential scanning calorimetry （DSC）, and automatic contact-angle measurements. The influence of the feed molar ratio of monomer-to-catalyst, the microwave irradiation power and the reaction time on the polymerization was also studied. The experimental results showed that HPPTC possessed significantly higher hydrophilicity and water absorption rate than PPTC.
基金supported by grants from the National Natural Science Foundation of China(Nos.21001085,20904045)the Natural Science Foundation of Hubei Province(No.2010CDB11104)Doctoral Program Foundation of Wuhan Institute of Technology(No.11105032)
文摘Two kinds of cyclic aryl ester dimers have been synthesized by reaction of phthaloyl dichloride with bisphenols via interfacial polycondensation. The cyclic dimers readily undergo anionic ring-opening polymerization or copolymerization in the melt by using sodium benzoate as the initiator, producing linear, high molecular weight polyesters. The contents of cyclic dimers in the homopolymers P1, P2, and copolymer P12 are 13.7%, 10.2%, 2.9%, respectively, which indicates that ring-opening copolymerization of cyclic dimers may impel the conversion of cyclic dimers and decrease the content of cyclic dimers in the resulting copolymer. Moreover, the isothermal chemorheology of the ring-opening copolymeriza- tion of cyclic dimers indicates that the reactive molten mixture has low shear viscosity and the viscosity increases slowly in the initial stage of ring-opening polymerization.
