Octa(aminophenyl)silsesquioxane (OAPS) was prepared from octaphenyl silsesquioxane (OPS) in two steps, first nitration to obtain Octa(nitrophenyl)silsesquioxane (ONPS) then reduction by using the stable, inexpensive, ...Octa(aminophenyl)silsesquioxane (OAPS) was prepared from octaphenyl silsesquioxane (OPS) in two steps, first nitration to obtain Octa(nitrophenyl)silsesquioxane (ONPS) then reduction by using the stable, inexpensive, and readily available hydrazine hydrate as the reducing agent in the presence of Iron(III)Chloride catalyst with a yield of around 87%. Hydrazine is a two-electron reducing agent whereas nitro group is a four-electron reduction process. The activated carbon serves as an adsorbent and electrical conductor enabling the reaction to occur by acting as a mediator between a two-electron reagent and a four-electron process. Adsorption provides a reducing potential and a supply of electrons from many hydrazines making possible the initial four-electron process even though each individual hydrazine is a two-electron donor. The product was characterized by FTIR and 1H NMR. The time period for preparation of ONPS from octaphenyl silsesquioxane was considerably shortened to avoid double nitration of the aromatic rings.展开更多
Various sectors of the industry are searching for new materials with specific requirements,providing improved properties.The study presents novel composite materials based on polylactide that have been modified with t...Various sectors of the industry are searching for new materials with specific requirements,providing improved properties.The study presents novel composite materials based on polylactide that have been modified with the organosilicon compound,(3-thiopropyl)polysilsesquioxane(SSQ-SH).The SSQ-SH compound is a mixture of cage structures and not fully condensed random structures.The composite materials were obtained through injection moulding.The study includes a comprehensive characterization of the new materials that analyze their functional properties,such as rheology(MFR),mechanical strength(tensile strength,Charpy impact strength),and thermal properties.SEM microscopic photos were also taken to analyze the microstructure of the samples.The addition of a 5%by-weight organosilicon compound to polylactide resulted in a significant increase in MFR by 73.8%compared to the neat polymer.The greatest improvement in impact strength was achieved for the 5%SSQ-SH/PLA composite,increasing it by 32.0 kJ/m^(2)compared to PLA,which represents an increase of up to 187%.The conducted research confirms the possibility of modifying the properties of the polymer by employing organosilicon compounds.展开更多
文摘Octa(aminophenyl)silsesquioxane (OAPS) was prepared from octaphenyl silsesquioxane (OPS) in two steps, first nitration to obtain Octa(nitrophenyl)silsesquioxane (ONPS) then reduction by using the stable, inexpensive, and readily available hydrazine hydrate as the reducing agent in the presence of Iron(III)Chloride catalyst with a yield of around 87%. Hydrazine is a two-electron reducing agent whereas nitro group is a four-electron reduction process. The activated carbon serves as an adsorbent and electrical conductor enabling the reaction to occur by acting as a mediator between a two-electron reagent and a four-electron process. Adsorption provides a reducing potential and a supply of electrons from many hydrazines making possible the initial four-electron process even though each individual hydrazine is a two-electron donor. The product was characterized by FTIR and 1H NMR. The time period for preparation of ONPS from octaphenyl silsesquioxane was considerably shortened to avoid double nitration of the aromatic rings.
基金supported by the Smart Growth Operational Programme(No.POIR.04.02.00-00-D003/20-00)European Funds(No.RPWP.01.01.00-30-0004/18)Ministry of Science and Higher Education(No.21/529535/SPUB/SP/2022).
文摘Various sectors of the industry are searching for new materials with specific requirements,providing improved properties.The study presents novel composite materials based on polylactide that have been modified with the organosilicon compound,(3-thiopropyl)polysilsesquioxane(SSQ-SH).The SSQ-SH compound is a mixture of cage structures and not fully condensed random structures.The composite materials were obtained through injection moulding.The study includes a comprehensive characterization of the new materials that analyze their functional properties,such as rheology(MFR),mechanical strength(tensile strength,Charpy impact strength),and thermal properties.SEM microscopic photos were also taken to analyze the microstructure of the samples.The addition of a 5%by-weight organosilicon compound to polylactide resulted in a significant increase in MFR by 73.8%compared to the neat polymer.The greatest improvement in impact strength was achieved for the 5%SSQ-SH/PLA composite,increasing it by 32.0 kJ/m^(2)compared to PLA,which represents an increase of up to 187%.The conducted research confirms the possibility of modifying the properties of the polymer by employing organosilicon compounds.
