The interaction between poly(methymethacrylate) (PMMA) and poly(vinyl chloride) (PVC) has been studied indilute urea solutions of dimethylformamide (DMF) at 28℃ using a dilute solution viscometry method. The results ...The interaction between poly(methymethacrylate) (PMMA) and poly(vinyl chloride) (PVC) has been studied indilute urea solutions of dimethylformamide (DMF) at 28℃ using a dilute solution viscometry method. The results show thatthe polymer mixtures are compatible in DMF solution in the absence of urea. The influence of urea addition on the degree ofcompatibility of the polymer mixtures has been studied in terms of the compatibility parameters (△b_m and △[η]_m). It wasfound that the compatibility of the polymer mixtures is decreased with increasing urea addition, passing through a minimumat 0.5 M urea.展开更多
With performance improvements,organic photovoltaics(OPVs)are an increasingly competitive technology for renewable energy.However,most high-performance OPVs are small-area devices processed from toxic halogenated solve...With performance improvements,organic photovoltaics(OPVs)are an increasingly competitive technology for renewable energy.However,most high-performance OPVs are small-area devices processed from toxic halogenated solvents via spin-coating,posing a challenge for mass production.We study a low-cost polymer donor(PTQ10)and a nonfullerene acceptor(DTY6)in a halogen-free solvent using industrially relevant blade coating.The non-inverted architecture performed best,achieving 12%efficiency,with the blade-coating deposition surpassing spin-coating.Active layers processed from the two coating techniques exhibited similar exciton quenching,likely due to the same measured nanodomain size and purity.However,blade-coated devices exhibited a higher charge carrier lifetime correlated with increased acceptor pi-stacking despite decreased donor pi-stacking.This suggests that optimizing crystallinity in bladecoated devices could result in even higher performance.Additionally,high performance in upscaled blade-coated devices(1 cm2)processed in air with a green solvent demonstrated the industrial potential of this system.展开更多
MgAl-LDH（layered double hydroxides） were prepared with CO（NH2）2, NH4 Cl and NH3·H2O by the coprecipitation method, respectively. Corresponding composite membranes were prepared by the coating method. LDHs wer...MgAl-LDH（layered double hydroxides） were prepared with CO（NH2）2, NH4 Cl and NH3·H2O by the coprecipitation method, respectively. Corresponding composite membranes were prepared by the coating method. LDHs were characterized by WAXS, CO2-TPD and SEM. The morphology of the PVC/LDHs composite membranes were characterized by means of SEM. The thermal stability of the membranes was analyzed by air aging box and TGA-FTIR. The SEM results show that nano-particles can be compatible with poly（vinyl chloride）（PVC） matrix homogeneously by the stirring-ultrasound blend method with two steps. Furthermore, the air aging box results proved that MgAl-CO（NH2）2-LDH has the best effect on thermal stability of PVC. TGA-FTIR results show that MgAl-CO（NH2）2-LDH could adsorb more HCl that resulted from the degradation of PVC and improve the pyrolysis temperature of the first degradation stage by 15 K compared with PVC.展开更多
文摘The interaction between poly(methymethacrylate) (PMMA) and poly(vinyl chloride) (PVC) has been studied indilute urea solutions of dimethylformamide (DMF) at 28℃ using a dilute solution viscometry method. The results show thatthe polymer mixtures are compatible in DMF solution in the absence of urea. The influence of urea addition on the degree ofcompatibility of the polymer mixtures has been studied in terms of the compatibility parameters (△b_m and △[η]_m). It wasfound that the compatibility of the polymer mixtures is decreased with increasing urea addition, passing through a minimumat 0.5 M urea.
基金the US National Science Foundation(NSF),Division of Materials Research,Electronic and Photonic Materials Program under grant#2247711support from the Bio Voltaico project n.A0613-2023-078175 of the POR FESR 2021/2027 Riposizionamento Competitivo RSI-Economia del Mare,Green Economy e Agrifood initiative,and Integrated Terrestrial And Non-Terrestrial Networks(ITANTN)project under the Research and innovation on future Telecommunications systems and networks,to make Italy more smart(RESTART)initiative of the PNRRsupported by the NSF Division of Physics Research Experience for Undergraduates under grant#2349426。
文摘With performance improvements,organic photovoltaics(OPVs)are an increasingly competitive technology for renewable energy.However,most high-performance OPVs are small-area devices processed from toxic halogenated solvents via spin-coating,posing a challenge for mass production.We study a low-cost polymer donor(PTQ10)and a nonfullerene acceptor(DTY6)in a halogen-free solvent using industrially relevant blade coating.The non-inverted architecture performed best,achieving 12%efficiency,with the blade-coating deposition surpassing spin-coating.Active layers processed from the two coating techniques exhibited similar exciton quenching,likely due to the same measured nanodomain size and purity.However,blade-coated devices exhibited a higher charge carrier lifetime correlated with increased acceptor pi-stacking despite decreased donor pi-stacking.This suggests that optimizing crystallinity in bladecoated devices could result in even higher performance.Additionally,high performance in upscaled blade-coated devices(1 cm2)processed in air with a green solvent demonstrated the industrial potential of this system.
基金supported by the Shanghai Municipal Education Commission with“Twelfth Five”scientific connotation construction project(No.nhky-2012-05)foreign visiting scholar fellowship program(No.B-8938-12-0406)Opening Project of Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering
文摘MgAl-LDH（layered double hydroxides） were prepared with CO（NH2）2, NH4 Cl and NH3·H2O by the coprecipitation method, respectively. Corresponding composite membranes were prepared by the coating method. LDHs were characterized by WAXS, CO2-TPD and SEM. The morphology of the PVC/LDHs composite membranes were characterized by means of SEM. The thermal stability of the membranes was analyzed by air aging box and TGA-FTIR. The SEM results show that nano-particles can be compatible with poly（vinyl chloride）（PVC） matrix homogeneously by the stirring-ultrasound blend method with two steps. Furthermore, the air aging box results proved that MgAl-CO（NH2）2-LDH has the best effect on thermal stability of PVC. TGA-FTIR results show that MgAl-CO（NH2）2-LDH could adsorb more HCl that resulted from the degradation of PVC and improve the pyrolysis temperature of the first degradation stage by 15 K compared with PVC.
