Polymer semiconductors with coplanar, π-extended confirmation and high electron affinity are regarded as the promising candidates for high-mobility ambipolar organic field-effect transistors. Herein a highly electron-deficient, coplanar, π-extended bis-pyridal[2,1,3]thiadiazole (BPT)...
Ladder-like aromatic diketones (LADK), which possess a coplanar π-extended geometry, a high electron deficiency as well as various attractive optoelectronic properties, are demonstrated as the promising candidates in building small-molecule organic electron-transporting materials, yet reports on direct integration of these structural motifs into n-type polymers are rarely accessed. Herein, it is demonstrated that a possibility of realizing unipolar n-type characteristics of such acceptor system by developing two novel donor-acceptor type polymers, in which the newly developed LADK unit, named as 3,8-bis(2-decyltetradecyl)-5,10-difluoro-s-indaceno[1,2-b:5,6-b′] dithiophene-4,9-dione (FIDTO-R), is adopted as the acceptor segments. The resulting polymers present deep-lying unoccupied molecular orbital levels (as low as −3.84 eV), compact π-π stacking (d-spacing, ≈3.57 Å) coupled with uniform nanofiber-like surface morphology. All these factors contribute to excellent unipolar n-type characteristics with high electron mobilities of 0.27 and 1.01 cm 2 V −1 s −1 , together with high inverter gain values of 141 and 80, respectively. The recorded values are among the best in n-type polymer field-effect transistors and associated inverter circuits. These findings unambiguously reveal that the as-prepared FIDTO-R and its analog LADK derivatives are another type of excellent building blocks for the construction of high-mobility n-type polymers.
The architectural heat-insulating coatings were prepared by means of high speed mechanical agitation when the polymer emulsions were used as binder of the coatings and the mixed nanoscale silicate composites and nano-oxides were used in the presences of some assistants. Two types of nanoscale silicate composites architectural heat-insulating coatings were designedly produced out. The wide-angle X-ray powder diffraction patterns and the SEM images of the products show that the coating films are dense. The thermal conductivities of the heat-insulating coatings are in the ranges of 0.094487~0.148973 W/m•°C which are obviously smaller than the standard rubber sheet, for example, the thermal conductivity of the calcium silicate nanowires composite coating is nearly 0.094487 W/m•°C only. The nanoscale silicate composite architectural heat-insulating coatings are in good agreement with the parameters in the GBT 17371-2008 (Silicate composite insulation coating).
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