We prepared a series of thermally remendable and recyclable polyurethanes crosslinked via reversible furan-maleimide Diels–Alder reaction based on TDI end-caped branched Voranol 3138 terminated with difurfurylamine and 4,4′-bis(maleimido)diphenylmethane (BMI). We showed that Young modulus strongly depends on BMI content (from 8 to 250 MPa) that allows us to obtain materials of different elasticity as simple as varying BMI content. The ability of DA and retro-DA reactions between furan and maleimide to reversibly bind material components was investigated by NMR spectroscopy, differential scanning calorimetry, and recycle testing. All polymers obtained demonstrated high strengths and could be recovering without significant loss in mechanical properties for at least five reprocessing cycles.
In article the review of assessment methods of the energy supplied to the surface of solar panels. Need of increase in accuracy of calculation of the solar energy entering on the panel is proved due to accounting of the additional influencing factors. A technique for estimating solar energy to the surface of panels has been developed. The degree of cloudiness influence on the solar energy input for the area under consideration is identified. Comparison of results of modeling with use of the developed technique and specialized computer programs is carried out. The comparison showed satisfactory results. Modeling of incoming solar energy for the existing solar power station showed a higher quality of the developed technique compared with specialized software. The optimal angle of inclination of the solar panel is calculated and the reduction of the incoming energy is analyzed when the angle deviates from the optimal value. The application of modeling of incoming solar energy intake to obtain daily graphs for the electricity generation of a solar power station and comparing them with daily graphs of the electrical load of the consumer is considered. Conclusions by results of researches are drawn.
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