Electrical conductivity of a sitall

Magrupov, M.A.; Umarov, A. V.; Khamidov, Sh. R.; Makhmudov, R. Kh.

doi:10.1007/bf00677447

Cited by 6 publications

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“…In comparatively high doses (1200 g/ha) it suppresses the causative agents of root rot and wilt. The preparation prevents the shedding of fruit organs and thereby increases the yield of raw cotton to 3800 kg/ha and the oil content of the seeds to 1% [112].…”

Section: Preparation "Roslin"mentioning

confidence: 99%

Cotton plant lignins

Abduazimov¹,

Smirnova²

1997

Chem Nat Compd

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This paper generalizes the results of studies on lignins isolated from the stems, bolls, and seed hulls of cotton plants of a number of varieties as functions of the vegetation periods of the plants. The UV, IR and 1H and 13C NMR spectra It was impossible to characterize the MWL from cotton seed hulls because of its low yield. The molecular masses of the lignins were determined, and they were subjected to nitrobenzene oxidation and to cleavage with sodium in liquid ammonia [4, 5]. The oxidation and cleavage products were found to include substances with gnaiacyl and syringyl structures. The process of isolating MWLs is lengthy and laborious, and the yields of lignins axe low. In view of this, Pepper's method and one involving ultrasound have been used for the isolation of ligrtins [6].However, the results of a study of the lignin obtained with the aid of ultrasound led to the conclusion that during isolation under the action of ultrasound the syringyl structures of the lignin are demethoxylated and the C3 side-chains are destroyed [7, 8]. Isolation of Dioxane Liotmins from the Cotton PlantAs already mentioned, one of the methods of isolating lignin from plants in a little-changed form and with good yield is Pepper's method [3]. It is based on the fact that lignin is extracted by aqueous dioxane (1:9) in the presence of catalytic amounts of hydrochloric acid with heating under a current of nitrogen. It has been confirmed with various plants that the lignin obtained by this method is very similar to the BjOrkman lignin [9][10][11][12][13][14][15].In order to obtain lignin from ripe cotton plant stems in unchanged form we have used a method perfected by V. M. Reznikov the essence of which is that all the operations, beginning with extraction and ending with precipitation of the li~min in water, are carried out under a current of nitrogen. To study the dynamics of the process, we performed the stepwise extraction of lignin for one, two, and three hours [16], so that the lignin being isolated did not undergo elaanges due to its Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (3712) 40 64 75.

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Section: Preparation "Roslin"mentioning

confidence: 99%

Cotton plant lignins

Abduazimov¹,

Smirnova²

1997

Chem Nat Compd

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Polymer-bitumen composition for insulation purpose

2023

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The aim of the work is to develop a polymer-bitumen insulating composition based on petroleum bitumen and secondary products of the chemical industry. Investigated the physical and chemical properties of the secondary product of the production of polypropylene, the adsorbent of the oil and gas industry, the powder of crushed tires. It has been established, the technology of their introduction into the compositions and their influence on the technological and physical-mechanical properties of polymer-bitumen compositions has been investigated, and their optimal content has been determined.

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Study of structure formation processes in matrices of mixed components with reinforcing natural fillers

Ziyamukhamedova,

Bakirov,

Donaev

et al. 2023

E3S Web of Conf.

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The article presents the results of a study on the development of compositions of heterocomposite materials based on natural dispersed and reinforcing fillers. Using the mechano-chemical modification method, structures were obtained that ensure the compatibility of elements of heterocomposites at the interfacial level at the interface of complex phases where components of different nature and composition are present. By studying the wetting process of the reinforcing filler - spruce fiber obtained from waste, the concentration of the chemical modifier was selected. It has been established that the activity of charged particles of mineral dispersed filler mechanically activated by an unconventional method, crushed with natural stones, lasts for 10-12 hours, which makes it possible to provide time for the maximum use of activity in the formation of stable structures.

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Electrical conductivity of a sitall

Cited by 6 publications

References 0 publications

Cotton plant lignins

Cotton plant lignins

Polymer-bitumen composition for insulation purpose

Study of structure formation processes in matrices of mixed components with reinforcing natural fillers

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