Double bond-functionalized POSS: dispersion and crosslinking in polyethylene-based hybrid obtained by reactive processing

Abstract

Polyethylene-based organic inorganic hybrids were prepared by one-step reactive melt mixing using a mono-functionalized nanofiller, i.e., allyl-heptaisobutyl-substituted polyhedral oligomeric silsesquioxane (1POSS) and a multi-functionalized octavinyl polyhedral oligomeric silsesquioxane (8POSS). The hybrids were also prepared in dicumyl peroxide (DCP) presence and morphological, spectroscopical and calorimetric analysis were carried out. Moreover, rheological measurement and Sohxlet extraction were performed on investigated samples. It was inferred that double bonds of POSS functional groups were triggered by radicals coming from the peroxide decomposition or from the degradation reactions occurring during preparation. The type of the functional groups (mono- or multi-reactive) of the POSS is a leading factor, along with radicals content in the systems, in the formation of a polymeric network. In particular, the presence of multi-reactive groups in 8POSS molecules results in a successful POSS grafting/crosslinking in the polymeric backbone: the covalent bonds formation between nanofillers and matrix during processing improves POSS dispersion within the polyolefin matrix and leads to a network structure formation

Hybrid supramolecular gels of Fmoc-F/halloysite nanotubes: systems for sustained release of camptothecin

“…This behaviour is usually reported for strong polymeric gels. 56,57 However, interestingly, the organogels flow at a lower value of strain than the hydrogels. The presence of f-HNT and f-HNT/CPT does not significantly influence the mechanical properties of the hydrogels in terms of the moduli and tan d values ( Fig.…”

Polymer‐based solid acid catalyst for the green production of diosgenin

“…28 In the spectra of the two reactants (seen Figure S1), there are 1619 cm À1 in SAA and 1628 cm À1 in MBA, corresponding to the C═C bond in the two chemicals. 29 However, the two peaks disappeared in the spectrum of the solid acid, indicating that the polymerization reaction was taken place and poly(MBA-SAA) was successfully prepared. The two reactants are soluble in water, while, the as prepared solid acid is insoluble in water, giving another evidence for the successful synthesis.…”

Unlocking the Potential Use of Reactive POSS as a Coagent for EPDM/PP-Based TPV

“…The authors reported that the resultant formation of a denser cross-linked network and better dispersion of the high-temperature resistant cage structure of DDSQ in the EPDM ablation resistance composites improved its mechanical and ablation performance [ 48 ]. Morici et al reported that a POSS type with vinyl groups was used to crosslink polyethylene with peroxides [ 49 ]. In this study, POSSs and PE were mixed with dicumyl peroxide (DCP) with one-step reactive melt mixing.…”