A novel functional MgO ∙ SiO₂/polyhedral oligomeric silsesquioxane hybrids as an active filler of polypropylene

Abstract

New organic/inorganic hybrid fi llers were obtained by mechanical modifi cation of magnesium silicate with selected polyhedral oligomeric silsesquioxane and characterized afterwards. MgO • SiO 2 was precipitated in a water system. The effect of chemical modifi cation of magnesium silicate surface on their physicochemical properties was determined. Functionalization was carried out with the use of different amount of (1-(3-hydroxypropyl)dimethylsiloxy-3,5,7,9,11,13,15-hepta(isobutyl)pentacyclo-[9.5.1.1 3,9 .1 5, 15 .1 7,13 ]octasiloxane). The polypropylene composites of 0.5, 1.0 and 1.5 wt.% modifi ed by 10 weight parts by the mass of the fi ller were also produced. For the obtained polypropylene composites measurements of the tensile strength, Young's modulus and elongation at break were performed.

Thermo‐rheological properties and miscibility of linear low‐density polyethylene‐silsesquioxane nanocomposites

“…Modification of polymers with silsesquioxanes received a considerable interest among researches nowadays. An influence of POSS additives on thermal, rheological, mechanical, and structural properties of thermoplastics and curable polymeric materials has been investigated . In case of polyolefins, it is proved that small amounts of POSS, less than 1 wt %, rarely lead to significant changes in polymer properties .…”

Modern concepts and methods in the chemistry of polyhedral metallasiloxanes

“…1), but only a few previous studies have described cage molecules containing 4, 6, 10, or 12 silsesquioxane fragments. By contrast, over 1000 previous studies have reported octameric cage molecules [RSiO 1.5 ] 8 (cubic structures) with different organic groups at the silicon atom [2,[11][12][13][14][15][16][17][18][19][20][21][22] (see Table 1). M a n u s c r i p t 3 This prevalence of octameric structures among structures with the same composition but different sizes is not accidental, and there are several possible explanations.…”

Application of in-line rheological measurements for characterization of polypropylene/opoka rock powder composites

“…The filler can be of either natural or synthetic origin and may have a different form [1,2]. Nowadays many researches are also being conducted into the production and application of multicomponent, and thereby multifunctional, fillers (that modify more than one property), so-called hybrid fillers [5][6][7]. Examples of this type of fillers are systems con- 1) Poznan University of Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, 60-965 Poznań, Poland.…”

“…2) University of Adam Mickiewicz in Poznan, Center for Advanced Technology, Umultowska 89c, 61-614 Poznań, Poland. * ) Author for correspondence: e-mail: Arkadiusz.Klozinski@put.poznan.pl taining polyhedral oligomeric silsesquioxanes (POSS), such as POSS/silica [5], POSS/lignin [6], POSS/MgO•SiO 2 [7], or the system phosphorylated cashew nut shell liquid prepolymer (PCNSL)/kaolin [8]. A hybrid filler, e.g., POSS/silica, not only constitutes a modern multifunctional system, but also allows an expensive filler (a POSS--type nanofiller) to be introduced to the polymer matrix by applying it onto the surface of an inexpensive and readily available carrier, which is silica.…”