Hydrogen bonding and mechanical properties of thin films of polyether-based polyurethane–silica nanocomposites

Bistričić, Lahorija; Baranović, Goran; Leskovac, Mirela; Bajsić, Emi Govorčin

doi:10.1016/j.eurpolymj.2010.08.001

Cited by 150 publications

(99 citation statements)

References 39 publications

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“…This morphology can be attributed to the higher site-specific interaction between TPU matrix and Mt-PPy.DBSA. The infrared spectra of neat TPU, TPU/PPy blends and TPU/Mt-PPy nanocomposites filled with 20 wt% is attributed to -NH group of urethane while the bands at 1219 and 1105 cm -1 are assigned to the ether group [43][44][45][46][47][48][49][50]. The spectra of the TPU/PPy and TPU/Mt-PPy exhibited overlapped absorption bands of PPy and TPU.…”

Section: Results and Discussion 31 Characterization Of Conductive Fmentioning

confidence: 97%

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Ramôa¹,

Barra²,

Merlini³

et al. 2015

Express Polym. Lett.

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Abstract. This work describes the production of electrically conductive nanocomposites based on thermoplastic polyurethane (TPU) filled with montmorillonite-dodecylbenzenesulfonic acid-doped polypyrrole (Mt-PPy.DBSA) prepared by melt blending in an internal mixer. The electrical conductivity, morphology as well as the rheological properties of TPU/MtPPy.DBSA nanocomposites were evaluated and compared with those of TPU nanocomposites containing different conductive fillers, such as polypyrrole doped with hydrochloride acid (PPy.Cl) or dodecylbenzenesulfonic acid (PPy.DBSA) or montmorillonite-hydrochloride acid-doped polypyrrole (Mt-PPy.Cl), prepared with the same procedure. The TPU/MtPPy.DBSA nanocomposites display a very sharp insulator-conductor transition and the electrical percolation threshold was about 10 wt% of Mt-PPy.DBSA, which was significantly lower than those found for TPU/Mt-PPy.Cl, TPU/PPy.Cl and TPU/PPy.DBSA. Morphological analysis highlights that Mt-PPy.DBSA filler was better distributed and dispersed in the TPU matrix, forming a denser conductive network when compared to Mt-PPy.Cl, PPy.Cl and PPy.DBSA fillers. This morphology can be attributed to the higher site-specific interaction between TPU matrix and Mt-PPy.DBSA. The present study demonstrated the potential use of Mt-PPy.DBSA as new promising conductive nanofiller to produce highly conductive polymer nanocomposites with functional properties.

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Section: Results and Discussion 31 Characterization Of Conductive Fmentioning

confidence: 97%

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Ramôa¹,

Barra²,

Merlini³

et al. 2015

Express Polym. Lett.

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“…However, the free volume in the nanocomposites increases due to poor wetting [17] and repulsive forces between the silica nanoparticles and the carboxylate groups in the PU chains. [18] The free volume is also increased due to the silica-induced disruption of packing of the hard segments in the PU polymers. [19] The above- mentioned increased free volume compensates for the increased crosslink density, resulting in the slightly decreased T g s for the nanocomposites.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Preparation and Properties of Aqueous Castor Oil‐based Polyurethane–Silica Nanocomposite Dispersions through a Sol–Gel Process

Xia

Larock

2011

Macromol. Rapid Commun.

108

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Waterborne castor oil-based polyurethane-silica nanocomposites with the polymer matrix and silica nanoparticles chemically bonded have been successfully prepared through a sol-gel process. The formation of silica nanoparticles in water not only reinforces the resulting coatings, but also increases the crosslink density of the nanocomposites. The (29)Si solid state NMR spectrum indicates the formation of silica and the TEM indicates that the nanoparticles are embedded in the polymers, resembling a core-shell structure. The silica nanoparticles in the polymer matrix play an important role in improving both the mechanical properties and the thermal stabilities of the resulting nanocomposites. This work provides an effective and promising way to prepare biorenewable, high performance nanocomposite coatings.

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“…Osim toga, punilo MWCNT-COOH zbog jačih međudjelovanja s matricom PU omogućava bolju faznu separaciju mekog i tvrdog segmenta matrice PU, slično kao u sustavu PU-a sa silika nanopunilom. 20 Bolja fazna separacija uzrokuje viši stupanj deformacijom inducirane kristalizacije i u konačnici više prekidne čvrstoće sustava s punilom MWCNT-COOH. Vrijednosti prekidnog istezanja snižavaju se za oba sustava te je nešto znatnije sniženje vidljivo za sustave s punilom MWCNT-COOH.…”

Section: Toplinska Postojanostunclassified

Utjecaj modifikacije višestjenih ugljikovih nanocjevčica na svojstva poliuretana: II. Mehanička svojstva, električna provodnost i toplinska postojanost

et al. 2017

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Hydrogen bonding and mechanical properties of thin films of polyether-based polyurethane–silica nanocomposites

Cited by 150 publications

References 39 publications

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Preparation and Properties of Aqueous Castor Oil‐based Polyurethane–Silica Nanocomposite Dispersions through a Sol–Gel Process

Utjecaj modifikacije višestjenih ugljikovih nanocjevčica na svojstva poliuretana: II. Mehanička svojstva, električna provodnost i toplinska postojanost

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