A novel UV-curable prepolymer polypropyleneglycol diglycidyl ether diacrylate （PPGGEA） was synthesized by utilizing polypropyleneglycol diglycidyl ether （PPGGE） and acrylic acid （AA） as starting materials, N, N-...A novel UV-curable prepolymer polypropyleneglycol diglycidyl ether diacrylate （PPGGEA） was synthesized by utilizing polypropyleneglycol diglycidyl ether （PPGGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were in the following： the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ~C, and the molar ratio of PPGGE to AA was 1：2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized PPGGEA to prepare a kind of UV-cured coating. The mechanical properties of the UV-cured films were determined, giving 29.99 MPa of tensile strength, 834.27 MPa of the Young＇s modulus and 5.66% of elongation at tear.展开更多
A novel UV-curable prepolymer hexanediol diglycidyl ether diacrylate （HDGEA） was synthesized by utilizing hexanediol diglycidyl ether （HDGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine ...A novel UV-curable prepolymer hexanediol diglycidyl ether diacrylate （HDGEA） was synthesized by utilizing hexanediol diglycidyl ether （HDGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimal synthetic conditions were that the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ℃, and the molar ratio of HDGE to AA was 1︰2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-curing initiator was added to the synthesized HDGEA to prepare a kind of UV-curing coating. The mechanical properties of the UV-cured films were determined, giving 31.87 MPa of tensile strength, 871.88 MPa of Young＇s modulus and 6.77% of elongation at tear.展开更多
Transparent wood has potential application in intelligent building,solar cell,electronics,and other advanced materials,while its single functionability hinders its further development.Flexible transparent wood(FTW)was...Transparent wood has potential application in intelligent building,solar cell,electronics,and other advanced materials,while its single functionability hinders its further development.Flexible transparent wood(FTW)was prepared by alkaline pretreatment and bleaching treat-ment of paulownia wood followed by impregnation of epoxy resin and ethylene glycol diglycidyl ether(EDGE).The eff ect of delignifi cation degree on the optical and mechani-cal properties of FTW was studied,and the infl uence of the epoxy/EDGE ratio on the fl exibility and mechanical proper-ties of FTW was also investigated.The results showed that higher delignifi cation degree resulted in higher transmit-tance of FTW.More EDGE addition led to better fl exibility of FTW,while overmuch addition of EDGE will reduce the mechanical properties.The optimal FTW sample resulted in a high transmittance of 89%and an ultrahigh haze value of 97%with outstanding fl exibility and excellent mechanical properties.The investigation of FTW broadens the research fi eld of transparent wood,and provides great possibility for its application in fl exible wearable devices and fl exible materials.展开更多
A novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate (NPGGEA) was synthesized by using neopentyl glycol diglycidyl ether (NPGGE) and acrylic acid (AA) as starting materials, N, N-dimethylbenzylam...A novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate (NPGGEA) was synthesized by using neopentyl glycol diglycidyl ether (NPGGE) and acrylic acid (AA) as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were taken as follows: The concentration of N,N-dimethylbenzylamine, 0.80% of reactants; the concentration of p-hydroxyanisole, 0.3% of reactants; the reaction temperature, 90-110 ; the molar ratio of NPGGE to AA, 1:2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized NPGGEA to prepare a kind of UV-cured coating. Mechanical properties of the UV-cured films were determined, giving 28.75 MPa of tensile strength, 923.82 MPa of Young’s modulus and 5.51% of elongation at tear.展开更多
Despite high production and usage,little is known about exposure to bisphenol diglycidyl ethers(BDGEs)and their derivatives in pregnant women and fetuses.In this study,we determined nine BDGEs in 106 paired maternal a...Despite high production and usage,little is known about exposure to bisphenol diglycidyl ethers(BDGEs)and their derivatives in pregnant women and fetuses.In this study,we determined nine BDGEs in 106 paired maternal and cord serum samples collected from e-waste dismantling sites in South of China.Bisphenol A bis(2,3-dihydroxypropyl)glycidyl ether(BADGE⋅2H_(2)O),bisphenol A(3-chloro-2-hydroxypropyl)(2,3-dihydroxypropyl)glycidyl ether(BADGE⋅HCl⋅H_(2)O),and bisphenol F diglycidyl ether(BFDGE)were the major BDGEs,with median concentrations of 0.57,4.07,and 1.60 ng/mL,respectively,in maternal serum,and of 3.58,5.61,and 0.61 ng/mL,respectively,in cord serum.The transplacental transfer efficiencies(TTEs)were estimated for BDGEs found in samples,and median values were in the range of 0.98(BFDGE)to 5.91(BADGE⋅2H_(2)O).Our results suggested that passive diffusion plays a role in the placental transfer of BADGE⋅HCl⋅H_(2)O and BFDGE,whereas several mechanisms contribute to the high accumulation of BADGE⋅2H_(2)O in cord serum.Multiple linear regression analysis indicated significant associations between maternal serum concentrations of BDGEs and blood clinical biomarkers,especially those related to liver injuries,such as alanine aminotransferase(ALT),aspartate aminotransferase(AST),alkaline phosphatase(ALP),and adenosine deaminase(ADA)(P<0.05).To our knowledge,this is the first study to report the occurrence of BDGEs in paired maternal–fetal serum samples and provide new insights into prenatal and fetal exposures.The newly discovered TTEs in maternal–fetal pairs contribute to a fuller inventory of the transmission activity of pollutants in the human body,ultimately adding to a more significant comprehensive risk evaluation.展开更多
基金the Innovatory Group Program of the Natural Science Foundation of Hubei Province(No.2004ABC001)the National"863"Hi-tech Foundation of China(No.2002AA6Z3083)
文摘A novel UV-curable prepolymer polypropyleneglycol diglycidyl ether diacrylate （PPGGEA） was synthesized by utilizing polypropyleneglycol diglycidyl ether （PPGGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were in the following： the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ~C, and the molar ratio of PPGGE to AA was 1：2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized PPGGEA to prepare a kind of UV-cured coating. The mechanical properties of the UV-cured films were determined, giving 29.99 MPa of tensile strength, 834.27 MPa of the Young＇s modulus and 5.66% of elongation at tear.
基金Funded by the Natural Science Foundation of Jiangxi Province (No.2008GZC0021)the National "863" Hi-tech Foundation of China (No.2002AA6Z3083)
文摘A novel UV-curable prepolymer hexanediol diglycidyl ether diacrylate （HDGEA） was synthesized by utilizing hexanediol diglycidyl ether （HDGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimal synthetic conditions were that the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ℃, and the molar ratio of HDGE to AA was 1︰2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-curing initiator was added to the synthesized HDGEA to prepare a kind of UV-curing coating. The mechanical properties of the UV-cured films were determined, giving 31.87 MPa of tensile strength, 871.88 MPa of Young＇s modulus and 6.77% of elongation at tear.
基金funded by the National Natural Science Foundation of China(31760183)the Natural Science Foundation of Guangxi(2016GXNSFCA380025)+1 种基金the Project Funded by China Postdoctoral Science Foundation(2017M620361)the Scientifi c Research Foundation of Guangxi University(XGZ150513).
文摘Transparent wood has potential application in intelligent building,solar cell,electronics,and other advanced materials,while its single functionability hinders its further development.Flexible transparent wood(FTW)was prepared by alkaline pretreatment and bleaching treat-ment of paulownia wood followed by impregnation of epoxy resin and ethylene glycol diglycidyl ether(EDGE).The eff ect of delignifi cation degree on the optical and mechani-cal properties of FTW was studied,and the infl uence of the epoxy/EDGE ratio on the fl exibility and mechanical proper-ties of FTW was also investigated.The results showed that higher delignifi cation degree resulted in higher transmit-tance of FTW.More EDGE addition led to better fl exibility of FTW,while overmuch addition of EDGE will reduce the mechanical properties.The optimal FTW sample resulted in a high transmittance of 89%and an ultrahigh haze value of 97%with outstanding fl exibility and excellent mechanical properties.The investigation of FTW broadens the research fi eld of transparent wood,and provides great possibility for its application in fl exible wearable devices and fl exible materials.
基金supported by the National High-Technology Research and Development Program of China (Grant No.2002AA6Z3083)
文摘A novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate (NPGGEA) was synthesized by using neopentyl glycol diglycidyl ether (NPGGE) and acrylic acid (AA) as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were taken as follows: The concentration of N,N-dimethylbenzylamine, 0.80% of reactants; the concentration of p-hydroxyanisole, 0.3% of reactants; the reaction temperature, 90-110 ; the molar ratio of NPGGE to AA, 1:2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized NPGGEA to prepare a kind of UV-cured coating. Mechanical properties of the UV-cured films were determined, giving 28.75 MPa of tensile strength, 923.82 MPa of Young’s modulus and 5.51% of elongation at tear.
基金The Natural Science Foundation of China(Nos.22022612,41877375,22036004,and 21677184)Natural Science Foundation of Guangdong Province,China(No.2020A0104006 and No.2021A1515010243)the Guangdong Provincial Key Laboratory Project(2019B121203011)for their partial research support.
文摘Despite high production and usage,little is known about exposure to bisphenol diglycidyl ethers(BDGEs)and their derivatives in pregnant women and fetuses.In this study,we determined nine BDGEs in 106 paired maternal and cord serum samples collected from e-waste dismantling sites in South of China.Bisphenol A bis(2,3-dihydroxypropyl)glycidyl ether(BADGE⋅2H_(2)O),bisphenol A(3-chloro-2-hydroxypropyl)(2,3-dihydroxypropyl)glycidyl ether(BADGE⋅HCl⋅H_(2)O),and bisphenol F diglycidyl ether(BFDGE)were the major BDGEs,with median concentrations of 0.57,4.07,and 1.60 ng/mL,respectively,in maternal serum,and of 3.58,5.61,and 0.61 ng/mL,respectively,in cord serum.The transplacental transfer efficiencies(TTEs)were estimated for BDGEs found in samples,and median values were in the range of 0.98(BFDGE)to 5.91(BADGE⋅2H_(2)O).Our results suggested that passive diffusion plays a role in the placental transfer of BADGE⋅HCl⋅H_(2)O and BFDGE,whereas several mechanisms contribute to the high accumulation of BADGE⋅2H_(2)O in cord serum.Multiple linear regression analysis indicated significant associations between maternal serum concentrations of BDGEs and blood clinical biomarkers,especially those related to liver injuries,such as alanine aminotransferase(ALT),aspartate aminotransferase(AST),alkaline phosphatase(ALP),and adenosine deaminase(ADA)(P<0.05).To our knowledge,this is the first study to report the occurrence of BDGEs in paired maternal–fetal serum samples and provide new insights into prenatal and fetal exposures.The newly discovered TTEs in maternal–fetal pairs contribute to a fuller inventory of the transmission activity of pollutants in the human body,ultimately adding to a more significant comprehensive risk evaluation.
