Fertilizer influence on the productivity of cereal-grass crop rotation and fertility of sod-podzolic light loamy soil

The application of complete organic-mineral fertilizer (N36P60K130 on the background of 8 t/ha manure) has provided a cereal-grass crop rotation productivity of 9.31 c/ha f. u. when the content of humus, phosphorus and potassium in the plough horizon on sod-podzolic light loamy soil is increased. The removal of nitrogen, phosphorus or potassium reduced the crop rotation productivity when the content of mobile phosphorus and potassium compounds in soils was decreased

Synthesis and characterization of fluorinated poly(azomethine ether)s from new core-fluorinated azomethine-containing monomers

<div><p></p><p>In this work, we describe the design and synthesis of novel core-fluorinated Schiff base monomers and conjugated polymers based on them. The new fully aromatic highly fluorinated poly(azomethine ether)s (PAMEs) were prepared by polycondensation of core-fluorinated azomethine-containing compounds. The structure of the monomers and polymers were confirmed by FTIR, ¹H, ¹³C, and ¹⁹F NMR spectroscopic analysis. The influence of synthesis condition on the properties of PAME compounds was investigated. Application of polarization microscopy with a temperature control thermal stage revealed thermotropic liquid crystalline (LC) behavior in the synthesized materials. Transition temperatures and a range of the existence of the LC phase were studied by a combination of the optical microscopy and DSC analysis. According to the TGA analysis, all the synthesized PAMEs show high thermal stability and thus offer a wide range of thermal processibility (up to 410–477 °C), which makes them prospective materials for many modern applications.</p></div

Peculiarities of Raman spectra of polyurethane/carbon nanotube composite

We present a detailed analysis of the Raman spectra of polyurethane (PU)/single wall carbon nanotube (SWCNT) composites obtained at room temperature using 488 and 514.5 nm laser excitation. The spectra reveal a significant influence of the polymeric matrix on the carbon nanotube bundles. The nanocomposite Raman bands become broader and are shifted to higher frequencies in comparison to the corresponding bands of the pristine SWCNT bundles. Redistribution of intensity in the vicinity of a G-band and an increase of splitting of the radial breathing mode are also observed for the nanocomposites. Various spectral features of SWCNT clearly indicate the large interfacial interaction of the PU matrix and the SWCNT, possibly due to the π-π stacking between the PU chains and the SWCNT