Polyethylene-based nanodielectrics containing octaisobutyl polyhedral oligomeric silsesquioxanes obtained by solution blending in xylene

Dielectric Properties of Epoxy/POSS and PE/POSS Systems

“…8 showing a gradual decrease of breakdown strength as the concentration of POSS is increased with the almost inevitable simultaneous increase of agglomeration. Similarly, results reported by Takala Much more detail results were reported by Guo and coauthors in a series of paper [12][13][14][15][16][17][18], with [17] summarizing the main findings for the case of LDPE/OibPOSS composites. Figures 11 and 12 illustrate the variation of the AC breakdown strength of LDPE-based composites as a function of type and the amount of POSS when the composites were fabricated by chemical blending (Fig.…”

“…3b) and octaisooctyl-POSS (OioPOSS, Fig 3c), bear in common alkyl-type radical groups that are expected to provide an adequate compatibility with an olefin host polymer. Accordingly, they have been investigated by several authors [7][8][9][10][11][12][13][14][15][16][17][18] as a potential enhancement-additive to polyethylene or polypropylene. OmPOSS and OibPOSS are crystalline solids with densities of respectively 1.5 g/cm 3 and 1.13 g/cm 3 , and are commercially available in the form of a white powder (Fig.…”

“…In the case of PE, good dispersion of POSS has been found even more difficult than in the case of PP. An extensive study on the effect of processing parameters and processing techniques on the microstructure of PE/POSS composites has been conducted by Guo and coauthors [11][12][13][14][15][16][17][18]. Figure 5 illustrates the SEM micrographs of Ultra High Molecular Weight Polyethylene (UHMWPE)/OibPOSS composites compounded by mechanical alloying.…”

Silsesquioxane Derivatives as Functional Additives for Preparation of Polyethylene-Based Composites: A Case of Trisilanol Melt-Condensation

“…As organosilicon hybrid compounds, SSQs tend to improve thermal stability of polymer matrices they are introduced into, but also modify materials rheology (e.g., as plasticizers or thixotropic agents) or improve mechanical properties, such as tensile or flexural modulus, tensile strength, heat deflection temperature. Different structures have been tested, including homo-(R n [SiO 1.5 ] n ) and heterosubstituted (R n-m R’ m [SiO 1.5 ] n ) systems, bearing either alkyl [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ], alkenyl [ 41 , 48 ], aryl [ 24 , 25 , 26 ], or other functional groups [ 26 , 41 , 49 , 50 , 51 , 52 ], introduced mostly by condensation, hydrosilylation, or substitution reactions. It has been proven that a choice of introduced functional groups plays a major role in miscibility of silsesquioxanes and polymer matrix and the additive tendency towards agglomeration, but also the processing method and parameters have an impact on the obtained additive dispersion in the final composite or nanocomposite [ 40 ].…”

“…Very good dispersion of the additives has been obtained when high-shearing-forces processes have been applied, such as twin-screw extrusion [ 22 , 23 , 44 ] or injection moulding [ 32 ]. Among other methods, ball milling [ 30 , 31 , 33 , 37 ], solution blending [ 34 , 35 ], or reactive melt blending [ 51 , 52 ] have been reported with moderate to good results. The dispersion level plays a huge factor on the properties of the obtained materials, and effective dispersing of the organosilicon additive is crucial to observe effects such as (nano)reinforcing action or thermal stabilization of the composition [ 11 , 12 , 13 , 14 , 15 ].…”