Flame retardancy and thermal stability of polyhedral oligomeric silsesquioxane nanocomposites

Wei, Ping; Zhao, Xiaomin; Jiang, Pingkai; Yu, Haizhou

doi:10.1002/fam.1126

Cited by 45 publications

(19 citation statements)

References 78 publications

(111 reference statements)

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“…It is in accordance with the results of previous investigations [23,28,29]. However, the fire behavior of foamed polyurethane materials is strongly influenced by their cellular structure that is modified in the presence of POSS nanocages.…”

Section: Flammability Studiessupporting

confidence: 92%

“…Large reduction of peak of heat release rate (PHRR) in comparison with pristine TPU was observed, and the protection mechanism was found to occur via an intumescent mechanism [22]. Recently, an attempt to evaluate the thermal stability and flame retardancy of POSS-containing polymer nanocomposites, including determination of structure-property relationships, was made by Qian and coworkers [23]. Generally, metal-containing POSS show good catalytic charring ability, whereby vinyl-and phenylcontaining POSS promote the strength of char.…”

Section: Introductionmentioning

confidence: 99%

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Thermal stability and flammability of polyurethane foams chemically reinforced with POSS

Michałowski

Hebda

Pielichowski

2017

J Therm Anal Calorim

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This work reports on the thermal stability and flammability of a novel class of rigid polyurethane foams chemically modified by functionalized 1,2-propanediolisobutyl POSS (PHI-POSS) as a pendant group and octa (3-hydroxy-3-methylbutyldimethylsiloxy) POSS (OCTA-POSS) as a chemical cross-link. The foamed hybrid materials were prepared in a three-step process using a sorbitol-based polyether polyol, polymeric 4,4 0 -diphenylmethane diisocyanate and dimethyl propane phosphonate as a flame retardant. The addition of the POSS modifier influences the PU cellular structure as evidenced by a change in anisotropy index of the cross section parallel to the growth direction. Based on thermogravimetric data and flammability results, one can suggest that there is char formation at the surface and the formed layer acts as an insulating barrier limiting heat and mass transfer with flame retardant and thus leading to decreased heat release rate, especially for systems containing OCTA-POSS.

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Section: Flammability Studiessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Thermal stability and flammability of polyurethane foams chemically reinforced with POSS

Michałowski

Hebda

Pielichowski

2017

J Therm Anal Calorim

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“…The capability of POSS for governing chain motion usually results in its usage as temperature boosting for nearly all types of thermoplastics (Joshi & Butola, 2004;Kuo & Chang, 2011). In addition to rigidity, dyeability and weight reduction characteristics, polymers containing POSS display delayed combustion and decrease in heat release rate as fire resistance behavior (Baykus et al, 2017;Gnanasekaran et al, 2009;Qian et al, 2013;Turgut et al, 2018;Zhang & Muller, 2013;Zhang et al, 2017;Zhao et al, 2008).…”

Section: Composites Extrusion Hybrid Compositesmentioning

confidence: 99%

Hybrid nanocomposites of elastomeric polyurethane containing halloysite nanotubes and POSS nanoparticles: tensile, hardness, damping and abrasion performance

Mohamed

Tirkeş

Akar³

et al. 2020

Clay miner.

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Thermoplastic polyurethane (TPU) matrix was reinforced with polyhedral oligomeric silsesquioxane (POSS) and halloysite nanotubes (HNT), both separately and combined. Composite samples were fabricated using a melt-compounding method. Characterization of the composites obtained was performed via tensile and hardness tests, melt-flow index measurements (MFI), abrasion tests, dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) to investigate the mechanical performance, flow behaviour, tribological characteristics, thermo-mechanical response and morphological properties. The greatest tensile strength value was obtained for the smallest HNT content. Further addition of HNT resulted in agglomerations for both POSS and HNT particles. The shore hardness of TPU was enhanced by filler inclusions. The TPU/POSS composites displayed significant improvement in terms of abrasion resistance compared to TPU at lower loading levels. The DMA study showed that composites containing 0.5% POSS and 1.0% HNT displayed the greatest storage modulus. The glass-transition temperature of TPU shifted to smaller values with the addition of both nanoparticles. The HNT inclusions increased the MFI value of TPU because of their large aspect ratio. Homogeneous mixing of nanoparticles in the TPU matrix was confirmed by a SEM study of the composites. Their dispersion decreased as the concentrations of POSS and HNT increased. An adjuvant effect of POSS with HNT was achieved in their hybrid composites.

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“…Even matched with a high loading LiFePO 4 cathode (≈12 mg cm −2 ), LMBs with PDMS‐OCH 3 grafted anode still enable highly reversible capacities over 120 and 100 mAh g −1 at 0.5C and 1C respectively. Polyhedral oligomeric silsesquioxane (POSS) terminated by eight phenyl‐groups is also employed as solid additive (another classic inert siloxane) for a comparison with PDMS liquid . This in situ “graft” strategy aided with liquid additive provides a new solution to the lithium dendrite hazard.…”

Section: Introductionmentioning

confidence: 99%

Liquid Polydimethylsiloxane Grafting to Enable Dendrite‐Free Li Plating for Highly Reversible Li‐Metal Batteries

Meng

Chu

et al. 2019

Adv Funct Materials

164

119

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Li-metal is considered as the most promising anode material to advance the development of next-generation energy storage devices owing to its unparalleled theoretical specific capacity and extremely low redox electrochemical potential. However, safety concerns and poor cycling retention of Li-metal batteries (LMBs) caused by uncontrolled Li dendrite growth still limit their broad application. Herein, liquid polydimethylsiloxane (PDMS) terminated by -OCH 3 groups is proposed as a graftable additive to reinforce the anode dendrite suppression for LMBs. Such a grafting triggers the formation of a conformal hybrid solid electrolyte interphase (SEI) with increased fractions of LiF and Li-Si-O-based moieties, which serve as a rigid barrier and ionic conductor for uniform Li-ion flow and Li-mass deposition. The grafting protected anode endows Li/Li symmetric cells with a long lifetime over 1800 h with a much smaller voltage gap (≈25 mV) betweenLi plating and stripping, than the naked anode. The coulombic efficiency values for Li/Cu asymmetric cells in carbonate electrolyte can reach up to 97% even at a high current density of 3 mA cm −2 or high capacity up to 4 mAh cm −2 . The liquid PDMS additive shows advantage over solid siloxane additives with poor grafting ability in terms of Li surface compaction and SEI stabilization.

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Flame retardancy and thermal stability of polyhedral oligomeric silsesquioxane nanocomposites

Cited by 45 publications

References 78 publications

Thermal stability and flammability of polyurethane foams chemically reinforced with POSS

Thermal stability and flammability of polyurethane foams chemically reinforced with POSS

Hybrid nanocomposites of elastomeric polyurethane containing halloysite nanotubes and POSS nanoparticles: tensile, hardness, damping and abrasion performance

Liquid Polydimethylsiloxane Grafting to Enable Dendrite‐Free Li Plating for Highly Reversible Li‐Metal Batteries

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