Bowen Zhang,Yiqi Zhang,Jiufu Zhu,Zhanchen Cui,Wei Wang,Zuosen Shi
High performance polymeric dielectrics are of critical importance for obtaining high carrier mobility and realizing low operating voltage in OTFTs. In this work, copolymers poly(methyl methacrylate) containing 4-fluorostyrene monomer were used as insulating layers for OTFTs devices of C10-DNTT. With the increase of 4-fluorostyrene, the threshold voltage shifted positively, and the random copolymer poly(4-fluorostyrene–methyl methacrylate–glycidyl methacrylate)-5 (P(FSt-co-MMA-co-GMA)-5) exhibited a threshold voltage lower to 1.8 V, a hole mobility of up to 0.518 cm2 V–1 s–1, and a dielectric constant value of 5.66. XRD spectra reveal that C10-DNTT has the best morphology at (001) peak as the dielectric copolymer contains 5% 4-fluorostyrene monomer.
Systematic investigation on the adsorption performance of polystyrene-based nanospheres towards persistent organic pollutants (POPs) is of great importance to the design of high-capacity adsorbent and the toxicological risk assessment of nano plastic. In this study, a series of polystyrene-based nanospheres with controllable microstructures, have been constructed successfully as model adsorbents, by the strategies of emulsion polymerization, hyper-crosslinking and direct carbonization. In the form of Solid phase microextraction (SPME) coatings, the impacts of microstructures on the adsorption performance of constructed nanospheres have been highlighted, by employing benzene series, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) as target adsorbates. Moreover, it is surprisingly found that the grafted F atoms make PS demonstrate better enrichment effects towards PCBs than the Cl atoms, mainly due to stronger sigma (σ)-hole interactions between F atoms and PCBs. In consideration of the most outstanding performance, the F-functionalized nanospheres (xFFNs)-coated SPME fiber is employed for the enrichment of PCBs from water samples, and the enrichment factors range from 1500 to 10030. After coupling the xFFNs-coated fiber with gas chromatography-mass spectrometry (GC-MS), highly sensitive analytical method is developed with detection limits of 0.08–0.89 ng L −1 , realizing precise quantifications of trace PCBs in treated sewage samples.
危险品化学品经营许可证（带存储）