Search results for "thermal properties"

showing 3 items of 33 documents

Polimeryzacja koordynacyjna alkenylosilseskwioksanów i ich kopolimeryzacja z olefinami lub styrenem

2015

Artykuł stanowi kontynuację przeglądu literatury dotyczącej koordynacyjnej polimeryzacji silseskwioksanów (POSS), zawierających zdolne do polimeryzacji wiązanie podwójne, oraz ich kopolimeryzacji głównie zolefinami, a także ze styrenem. Zastosowanie katalizatorów metalocenowych aktywowanych metyloaluminoksanem (MAO) zapewnia efektywną (ko)polimeryzację silseskwioksanów zarówno z olefinami, jak i styrenem. Wprowadzenie do materiału polimerowego komonomeru POSS korzystnie wpływa na właściwości otrzymanych produktów, które cechują się większą odpornością termiczną oraz wytrzymałością mechaniczną niż ich odpowiedniki niezawierające POSS.

poliedryczne oligomeryczne silseskwioksany (POSS)coordination (co)polymerization(ko)polimeryzacja koordynacyjnametallocene catalyststhermal propertieswłaściwości termicznemechanical propertieskatalizatory metalocenowewłaściwości mechanicznepolyhedral oligomeric silsesquioxanes (POSS)Polimery
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Mapping soil water content under sparse vegetation and changeable sky conditions: comparison of two thermal inertia approaches

2013

A critical analysis of a thermal inertia approach to map surface soil water content on bare and sparsely vegetated soils by means of remotely sensed data is reported. The study area is an experimental field located in Barrax, Spain. In situ data were acquired within the Barrax 2011 research project. An advanced hyperspectral scanner airborne imager provides images in the visible/near-infrared and thermal infrared bands. Images were acquired both in day and night times by the Instituto Nacional de Técnica Aeroespacial between 12th and 13th of June 2011. The scene covers a corn irrigation pivot surrounded by bare soil, where a set of in situ data have been collected both previously and simult…

sparse vegetationCloud covermedia_common.quotation_subjectSettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaHyperspectral imagingcloudiness.soil water contentVegetationthermal inertiaSoil thermal propertiesSkySoil waterThermographyGeneral Earth and Planetary SciencesEnvironmental scienceSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliWater contentSettore ICAR/06 - Topografia E Cartografiamedia_commonRemote sensing
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A library of monoalkenylsilsesquioxanes as potential comonomers for synthesis of hybrid materials

2018

In this paper we demonstrate a facile and efficient synthesis of monoalkenylsubstituted POSS compounds, i.e., R7(Si8O12)-alkenyl and R7(Si8O12)(OSiMe2)-alkenyl with a functional alkenyl group of chain length (from vinyl to dec-9-enyl, with or without additional –OSiMe2– spacer between the silsesquioxane core and alkenyl moiety) and with five types of inert groups (Et, iBu, iOc, Cy, Ph) at the POSS core. These compounds constitute a library of monosubstituted POSS systems, including thorough spectroscopic and thermal characteristics. These findings could be especially useful for material chemists applying the compounds as modifiers or comonomers for copolymerization reaction, e.g., with olef…

thermal propertiespolyhedral oligomeric silsesquioxanes02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesalkenylsubstituted silsesquioxanesthermal stabilitySilsesquioxane0104 chemical scienceschemistry.chemical_compoundChain lengthchemistryCopolymerOrganic chemistryMoietyPhysical and Theoretical Chemistry0210 nano-technologyHybrid materialJournal of Thermal Analysis and Calorimetry
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