Self-assembly of polyhedral oligomeric silsesquioxane structures through ion exchange

Luvison, Caroline; Wanke, Cesar Henrique; Moura, Sidnei; Manchado, Giovanna; Farias, M.C.M.; Bianchi, Otávio

doi:10.1016/j.mseb.2019.03.019

Cited by 2 publications

(4 citation statements)

References 55 publications

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“…The POSS crystallization phenomenon is described in the literatures. [7,10,12] POSS crystallization in POSS-containing polymer nanocomposites has also been addressed in other studies. [ 15,16,19] The threshold for the crystallization in POSS-containing polymer nanocomposites is dependent on the physical-chemical interactions among the polymer chains and POSS pendant groups (R), along with the mixing intensity.…”

Section: Phase Morphology and Crystalline Structure Of Pp-poss Matementioning

confidence: 99%

“…Based on the TEM images of solidified PP-POSS systems ( Figure 3A-C), it is possible to estimate that POSS droplets dispersed in the PP-POSS in the molten state are around 1 μm in diameter, assuming they are spherical. Considering that the diameter of each POSS molecule is approximately 5 nm, [12] it is possible to estimate that each POSS droplet should contain around 8 × 10 6 POSS molecules. As the POSS droplets dispersed within the PP matrix are much larger compared to the size of the PP chains, the effect of steric barriers preventing the flow is suppressed and, therefore, they are unlikely to offer effective resistance to the movement of the PP chains.…”

Section: Rheological Properties Of Pp-poss Materialsmentioning

confidence: 99%

“…Moreover, the chemical nature of the pendant group (R) defines the POSS solubility in organic solvents and its dispersion in polymers. [9][10][11][12] In many cases, POSS is copolymerized into polymer chains, forming a homogeneous structure. [13] Several POSS-filled polymer-matrix nanocomposites have been reported in the literature in the past two decades.…”

Section: Introductionmentioning

confidence: 99%

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A survey of the rheological properties, phase morphology, and crystallization behavior of PP‐POSS materials with weak phase separation

Bianchi

Ornaghi

Martins

et al. 2020

Polymer Engineering & Sci

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Polypropylene (PP) compounds with varying amounts (0.4‐8.2 vol%) of tailored allyl‐isobutyl polyhedral oligomeric silsesquioxane (POSS) were prepared by melt‐blending. The dependence of the crystallization behavior and crystalline structure of PP on the melt‐state phase morphology of PP‐POSS materials is addressed. PP‐POSS systems were predicted to exhibit weak phase separation in both the molten and solid states based on Bagley plot using Hansen solubility parameters. Small‐amplitude shear rheometry analysis suggested that the highest loaded (8.2 vol%) PP‐POSS system behaves as a two‐liquid emulsion, whereas the low‐content POSS (0.4‐4.0 vol%) systems deviate from this model, resembling a polymer nanocomposite. Based on these findings we hypothesized the formation of a heterogeneous phase morphology in the molten state comprised of nano‐size “pseudo‐solid” POSS clusters and micrometer‐size “pseudo‐liquid” POSS droplets dispersed within the PP matrix, depending on the POSS content. Upon cooling, POSS droplets comingle, forming cube‐like micrometer‐sized crystal domains. The nonisothermal crystallization of PP is enhanced by the presence of POSS clusters. Small‐angle X‐ray scattering analysis revealed the formation of thinner and more heterogeneous folded chain PP lamellae in the PP‐POSS systems.

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Section: Phase Morphology and Crystalline Structure Of Pp-poss Matementioning

confidence: 99%

Section: Rheological Properties Of Pp-poss Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A survey of the rheological properties, phase morphology, and crystallization behavior of PP‐POSS materials with weak phase separation

Bianchi

Ornaghi

Martins

et al. 2020

Polymer Engineering & Sci

Self Cite

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“…It is mainly composed of two parts: (i) The cage structure core of the inorganic hexahedron is composed of a Si–O–Si bond, which makes the molecule have good thermal stability. (ii) The shell formed by organic functional groups is connected to the eight vertices of a Si atom, where the R group can be an active or inert group, including a hydrogen group, alkyl group, enyl group, aryl group and their derivative groups [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Graphene Nanofiller on the Surface Structure and Performance of Epoxy Resin–Polyhedral Oligomeric Silsesquioxane (EP-POSS)

Fang

Wang

Sun³

et al. 2021

Nanomaterials

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Epoxy resin–polyhedral oligomeric silsesquioxane (EP-POSS) has excellent mechanical properties and hydrophobic properties. In order to adapt for application in sensor and photovoltaic fields, graphene, nano-SiO2 and nano-ZnO were used to modify EP-POSS. FTIR was used to characterize changes on the surface structure after introducing nanoparticles. The change of hydrophobicity was measured using a contact angle test. TEM test results showed that nanoparticles were successfully inserted between the graphene sheets. However, the content of Si on the surface was low, as the cage structure of POSS in the molecular chain was coated by epoxy groups. XRD tests indicated that nanoparticles facilitated the dispersion of graphene in EP-POSS. XPS characterized the chemical state and content of the elements, confirming that the addition of graphene can induce the enrichment of Si on the surface of EP-POSS, which had a shielding effect on the main chain and improved the hydrophobicity. Wear resistance and adhesion tests showed that, after the introduction of nanoparticles, the EP-POSS coating film met the requirements of graphene materials.

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Self-assembly of polyhedral oligomeric silsesquioxane structures through ion exchange

Cited by 2 publications

References 55 publications

A survey of the rheological properties, phase morphology, and crystallization behavior of PP‐POSS materials with weak phase separation

A survey of the rheological properties, phase morphology, and crystallization behavior of PP‐POSS materials with weak phase separation

The Effect of Graphene Nanofiller on the Surface Structure and Performance of Epoxy Resin–Polyhedral Oligomeric Silsesquioxane (EP-POSS)

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