Segmental dynamics in hybrid polymer/POSS nanomaterials

Raftopoulos, Konstantinos N.; Pielichowski, Krzysztof

doi:10.1016/j.progpolymsci.2015.01.003

Cited by 161 publications

(124 citation statements)

References 222 publications

(246 reference statements)

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“…The effect of increased storage modulus and decreased glass transition temperature was found, for example, for PLA/nanocrystalline cellulose nanocomposites by Fortunati et al (2012b). On the other hand, the polymer-filler interactions are known to have opposite effect of rendering the a relaxation of polymer matrix and shifting it towards higher temperatures (Ahn et al 2009;Papon et al 2012;Raftopoulos and Pielichowski 2015). Slight increase of T g was reported for instance for acetylated cellulose nanoparticles blended with PLA (Abdulkhania et al 2014;Lin et al 2011).…”

Section: Dynamic Mechanical Analysis Of Pa410/mfc-ac Compositesmentioning

confidence: 97%

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

2015

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Novel bio-polyamides obtained from renewable resources, e.g. PA4.10, are considered nowadays as promising 'green' engineering materials consisting of building blocks derived from castor oil. In this work the composites of heterogeneously acetylated microfibrillated cellulose (MFC) and biopolyamide 4.10 have been prepared by melt blending. Thermoplastic processing of PA4.10/MFC composites was possible in a narrow temperature window due to significant improvement of thermal stability of acetylated MFC as compared to raw MFC. The increase of thermooxidative stability of filler was due to removal of non-cellulosic components from the raw material and introduction of acetic moieties that had additional slight stabilizing effect on MFC. Moreover, the modified MFC showed significant changes in morphology that favoured its dispersibility in viscous polymer melt. Combined treatment of MFC by chemical agents, which caused partial hydrolysis of amorphous regions, and physical disintegration by ultrasonic waves resulted in formation of fibrous material with low degree of entanglement and submicron or nanometric diameters. In the tested range of screw speeds it was found that at screw speed of 100 rpm the shearing forces were sufficient for dispersing MFC agglomerates and the melt pressure secured evacuation of gases introduced to plasticizing system of extruder with MFC-Ac aerogel. The dynamic mechanical properties of obtained (nano)-composites were influenced by both mechanical strengthening of rigid cellulose micro and nanofibers as well as susceptibility of biopolymers towards oxidation and thermomechanical degradation during processing.

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Section: Dynamic Mechanical Analysis Of Pa410/mfc-ac Compositesmentioning

confidence: 97%

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

2015

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“…Reproduced with permission from American Chemical Society of dispersion. That said, we would like to point out that the mechanisms by which POSS affect the dynamics of any polymer-not only copolymers like PUs-are very complex [18]. The reason is that POSS themselves are moieties with size smaller than a nanoparticle and comparable to an oligomer: their siliceous core is of size * 0.5 nm [76], smaller than that of a conventional filler.…”

Section: Glass Transitionmentioning

confidence: 99%

“…The backbone of those cages substituents determines to a large extent the compatibility of these molecules to the polymer, possible chemical reactions and thus the final structure of the POSS composite. It will directly or indirectly alter, to an extent, the thermal, barrier, flammability reduction and other physical properties [12][13][14][15][16][17][18].…”

Section: Polyhedral Oligomeric Silsesquioxanes (Poss)-definition and mentioning

confidence: 99%

The influence of POSS nanoparticles on selected thermal properties of polyurethane-based hybrids

Pielichowski

Raftopoulos

Pielichowski

2017

J Therm Anal Calorim

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Organic-inorganic hybrid materials, prepared via chemical synthesis route or physical blending of functionalized nanofillers within polymer matrix, have gained an increased attention in the recent years. Polyhedral oligomeric silsesquioxane (POSS) nanoparticles, due to their nanometer size and functionalization possibilities, are applied as effective modifiersboth chemical and physical, for polymer matrices, including polyurethanes (PU). In this work, we describe the synthesis and processing of polyurethane/POSS hybrid nanocomposites and discuss the influence of POSS moieties on the thermal properties of PU matrices. Glass transition, the crystallinity of the soft phase, as well as the order-disorder transitions are affected by the incorporation of POSS in the polyurethane structure. Direct polymer-POSS interaction, or -indirect-due to the suppression or enhancement of microphase separation by the POSS moieties are discussed in terms of topology of the polymeric structure with the key role of POSS functionalization.

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“…In particular, various types of organic chains can be attached to the POSS cage, which can modify its solubility in different polymers, providing a better dispersion in the matrix [56]. The groups attached to the Si atoms of POSS can be used to enhance the compatibility with the host polymer taking benefit of the properties of inorganic nanoparticles [57]. POSS, when grafted with reactive functional groups, can be copolymerized with more conventional monomers.…”

Section: Introductionmentioning

confidence: 99%

vQRS Based on Hybrids of CNT with PMMA-POSS and PS-POSS Copolymers to Reach the Sub-PPM Detection of Ammonia and Formaldehyde at Room Temperature Despite Moisture

Sachan¹,

Castro

Choudhary³

et al. 2017

Chemosensors

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Nanocomposite-based quantum resistive vapour sensors (vQRS) have been developed from the assembly of hybrid copolymers of polyhedral oligomeric silsesquioxane (POSS) and poly(methyl methacrylate) (PMMA) or poly(styrene) (PS) with carbon nanotubes (CNT). The originality of the resulting conducting architecture is expected to be responsible for the ability of the transducer to detect sub-ppm concentrations of ammonia and formaldehyde at room temperature despite the presence of humidity. In particular, the boosting effect of POSS is evidenced in CNT-based nanocomposite vQRS. The additive fabrication by spraying layer-by-layer provides (sLbL) is an effective method to control the reproducibility of the transducers' chemo-resistive responses. In dry atmosphere, the two types of sensors showed a high sensitivity towards both hazardous gases, as they were able to detect 300 ppb of formaldehyde and 500 ppb of ammonia with a sufficiently good signal to noise ratio (SNR > 10). They also exhibited a quick response times less than 5 s for both vapours and, even in the presence of 100 ppm of water, they were able to detect small amounts of gases (1.5 ppm of NH 3 and 9 ppm of CH 2 O). The results suggest promising applications of POSS-based vQRS for air quality or volatolome monitoring.

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Segmental dynamics in hybrid polymer/POSS nanomaterials

Cited by 161 publications

References 222 publications

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

The influence of POSS nanoparticles on selected thermal properties of polyurethane-based hybrids

vQRS Based on Hybrids of CNT with PMMA-POSS and PS-POSS Copolymers to Reach the Sub-PPM Detection of Ammonia and Formaldehyde at Room Temperature Despite Moisture

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