Polymer solar cells(PSCs)consisting of a polymer donor and a small molecular acceptor is a promising photovoltaic technology,whose device performance is determined by both polymer donor and small molecular acceptor.Ha...Polymer solar cells(PSCs)consisting of a polymer donor and a small molecular acceptor is a promising photovoltaic technology,whose device performance is determined by both polymer donor and small molecular acceptor.Halogen atoms such as fluorine or chlorine atoms were usually introduced onto the polymer donors to downshift the highest occupied molecular orbital(HOMO)energy levels and improve the open-circuit voltage(VOC)of the PSCs.However,the introduction of the halogen atoms especially fluorine atoms greatly complicates the polymer synthesis.Herein,we report the use of a structural simple and easily synthesized building block,3,4-dicyanothiophene(DCT),to construct a set of halogen-free polymer donors PBCNTx(x=25,50,75)via ternary random copolymerization.The introduction of DCT units not only simplified the synthesis,but also downshifted the HOMO energy levels of the polymers and improved the V_(OC) of PSCs effectively.Encouragingly,the PBCNT75 afforded a power conversion efficiency up to 15.7%with a V_(OC) of 0.83 V,which are among the top values for halogen-free polymer donors.This work shows that the introduction of DCT units is a simple yet effective strategy to construct halogen-free and low-cost polymer donors for high-performance PSCs.展开更多
This study was to develop the flame retardant (FR) protective clothing which had multifunction such anti-bacterial, UV cut, FR function with water repellent and water vapor permeable laminating textiles for industrial...This study was to develop the flame retardant (FR) protective clothing which had multifunction such anti-bacterial, UV cut, FR function with water repellent and water vapor permeable laminating textiles for industrial workers. First of all, the FR yarn and FR textiles were developed for this purpose. Second, the comparison analysis between the halogen laminating textiles and halogen-free laminating textiles were tested to figure out the eco-friendly laminating method. Third, the flame retardant ability was compared the halogen laminated textiles to halogen-free laminated textiles. LOI, UV protection ratio, antibiosis after 50 laundry test, water proof pressure, and moisture permeability of developed textiles were tested. GC-HR-TOF-MS was used for analysis of laminating film (halogen and halogen-free). 4.1 wt% TiO2 yarn showed antibacterial function (Pneumococcus & Staphylococcus aureus: 99.9%), UV Protection (UVA: 90.8, UVB: 92.1), and LOI (33.6). The chosen optimal compounding ratio for PU compound of HRF and HFFR were as followed: PU resin 58.3%, DMF (Dimethyl formamide, δ = 12.2) 8.3%, MEK (Methylethylketone) 8.3% and FR (flame retardants) 25.0%. Binder for laminating should not be included over 10% of FRs because of adhesion between textiles and FR laminating film. There were detected phosphorus compounds in the textiles treated by halogenated type flame retardants and halogenated-free type flame retardants. There were not any detected harmful compounds from all textile samples.展开更多
基金The work was financially supported by the Ministry of Science and Technology of China(Nos.2017YFA0206600 and 2019YFA0705900)the National Natural Science Foundation of China(Nos.21875072,U20A6002 and 51973169)+2 种基金Guangdong Innovative and Entrepreneurial Research Team Program(No.2019ZT08L075)This study also received financial support from Science and Technology Foundation of Guangdong Province(No.2021A0101180005)Special Projects in Key Areas for the University of Guangdong Province(No.2021ZDZX1009).
文摘Polymer solar cells(PSCs)consisting of a polymer donor and a small molecular acceptor is a promising photovoltaic technology,whose device performance is determined by both polymer donor and small molecular acceptor.Halogen atoms such as fluorine or chlorine atoms were usually introduced onto the polymer donors to downshift the highest occupied molecular orbital(HOMO)energy levels and improve the open-circuit voltage(VOC)of the PSCs.However,the introduction of the halogen atoms especially fluorine atoms greatly complicates the polymer synthesis.Herein,we report the use of a structural simple and easily synthesized building block,3,4-dicyanothiophene(DCT),to construct a set of halogen-free polymer donors PBCNTx(x=25,50,75)via ternary random copolymerization.The introduction of DCT units not only simplified the synthesis,but also downshifted the HOMO energy levels of the polymers and improved the V_(OC) of PSCs effectively.Encouragingly,the PBCNT75 afforded a power conversion efficiency up to 15.7%with a V_(OC) of 0.83 V,which are among the top values for halogen-free polymer donors.This work shows that the introduction of DCT units is a simple yet effective strategy to construct halogen-free and low-cost polymer donors for high-performance PSCs.
文摘This study was to develop the flame retardant (FR) protective clothing which had multifunction such anti-bacterial, UV cut, FR function with water repellent and water vapor permeable laminating textiles for industrial workers. First of all, the FR yarn and FR textiles were developed for this purpose. Second, the comparison analysis between the halogen laminating textiles and halogen-free laminating textiles were tested to figure out the eco-friendly laminating method. Third, the flame retardant ability was compared the halogen laminated textiles to halogen-free laminated textiles. LOI, UV protection ratio, antibiosis after 50 laundry test, water proof pressure, and moisture permeability of developed textiles were tested. GC-HR-TOF-MS was used for analysis of laminating film (halogen and halogen-free). 4.1 wt% TiO2 yarn showed antibacterial function (Pneumococcus & Staphylococcus aureus: 99.9%), UV Protection (UVA: 90.8, UVB: 92.1), and LOI (33.6). The chosen optimal compounding ratio for PU compound of HRF and HFFR were as followed: PU resin 58.3%, DMF (Dimethyl formamide, δ = 12.2) 8.3%, MEK (Methylethylketone) 8.3% and FR (flame retardants) 25.0%. Binder for laminating should not be included over 10% of FRs because of adhesion between textiles and FR laminating film. There were detected phosphorus compounds in the textiles treated by halogenated type flame retardants and halogenated-free type flame retardants. There were not any detected harmful compounds from all textile samples.
