Novel hybrid polyurethane/POSS materials via bulk polymerization

Prządka, Dawid; Jȩczalik, Jerzy; Andrzejewska, Ewa; Marciniec, Bogdan; Dutkiewicz, Michał; Szłapka, Maria

doi:10.1016/j.reactfunctpolym.2012.09.006

Cited by 39 publications

(36 citation statements)

References 66 publications

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“…Octa isocyanate-functional POSS was in-built to a PU hyperbranched structure prepared using a mixture of polyoxipropylene diol and triol as soft segments and either isophore diisocyanate or 1.6-hexametrhylene diisocyanate [148]. The glass transition was governed by the soft segments, so only minor increases in T g by a few degrees were observed upon addition of POSS, for both the hard segments.…”

Section: Crosslinked Systemsmentioning

confidence: 99%

Segmental dynamics in hybrid polymer/POSS nanomaterials

Raftopoulos

Pielichowski

2016

Progress in Polymer Science

159

105

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Section: Crosslinked Systemsmentioning

confidence: 99%

Segmental dynamics in hybrid polymer/POSS nanomaterials

Raftopoulos

Pielichowski

2016

Progress in Polymer Science

159

105

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“…15 Increases in T g of POSS-modified PU systems have been reported and are attributed to nanoreinforcement and restriction of mobility due to constraints imposed by crosslinking. 12,13 In the case of PU−POSS network systems, particle aggregation appears to partially counteract the reinforcing effect of the POSS cross-linker.…”

Section: ■ Introductionmentioning

confidence: 99%

Reduced Phase Separation and Slowing of Dynamics in Polyurethanes with Three-Dimensional POSS-Based Cross-Linking Moieties

et al. 2015

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Octa-OH-functional POSS has been incorporated into a model polyurethane elastomer as a comparatively massive and notionally "robust" 3-dimensional cross-linking core. The effects of this cross-linking moiety on the morphology and molecular dynamics of the system are studied over a range of size and time scales. Microscopy, scattering, spectroscopic, thermal, and dielectric techniques, in agreement with each other, show that the covalent inclusion of the crosslinking particles restricts microphase separation, inhibits the formation of hard-block domains, and decelerates the motional dynamics of the polyurethane backbone. The effects on both the morphology and the dynamics of the polyurethane system are not continuous but occur in a steplike manner in the loading region of 4−6 wt % POSS. This critical region is thought to correspond to a sterically induced transition from one dominant morphology (microphase segregated) to an increasingly homogeneous nanophase segregated domain morphology. Contrary to expectations, cross-linking, even by the presumably rigid siliceous nanoparticles, reduces the mechanical modulus. In conjunction with the reduction of microphase separation, this observation indicates that the hard microdomains reinforce the polymer more effectively than the chemical cross-links.

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“…The covalent incorporation of reactive silsesquioxane monomers into polymers is the greatest advantage of the proposed fillers. The formation of covalent bonds between the polymer matrix and the filler permits obtaining inseparable hybrid material based on organic, functional polymers (e.g., epoxides, polyamides, methacrylates, or polyurethanes) [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Polyurethane composites based on silsesquioxane derivatives of different structures

Szołyga

Dutkiewicz

Marciniec

2018

J Therm Anal Calorim

Self Cite

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A series of siloxane-silsesquioxane resins with Q 8 structures, as network nodes containing reactive Si-H groups in the siloxane backbone, connecting silsesquioxane moieties, were prepared in a hydrolytic condensation process and successfully functionalized by hydrosilylation of allyl alcohol. The proposed material being an alternative to the well-defined silsesquioxanes has been characterized and used for preparation of a series of polyurethane (PU)-based composites by simple reaction of 3-hydroxypropyl groups of siloxane-silsesquioxane resin with 1,6-diisocyanatohexane and subsequently with 1,6-hexanediol to get polyurethane composite. A series of composites based on PU and octakis(3-hydroxypropyldimethylsiloxy)octasilsesquioxane were prepared in the same manner to investigate the influence of the filler amount (1, 3 or 5%) and its structure on thermal properties of the obtained materials.

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Novel hybrid polyurethane/POSS materials via bulk polymerization

Cited by 39 publications

References 66 publications

Segmental dynamics in hybrid polymer/POSS nanomaterials

Segmental dynamics in hybrid polymer/POSS nanomaterials

Reduced Phase Separation and Slowing of Dynamics in Polyurethanes with Three-Dimensional POSS-Based Cross-Linking Moieties

Polyurethane composites based on silsesquioxane derivatives of different structures

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