Effect of biaxial drawing on morphology and properties of copolyamide nanocomposites produced by film blowing

Garofalo, Emilia; Fariello, Maria Letizia; Maio, Luciano Di; Incarnato, Loredana

doi:10.1016/j.eurpolymj.2012.09.024

Cited by 25 publications

(17 citation statements)

References 33 publications

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“…The formation of a network structure, that leads to an elastic reinforcement and to the transformation from the liquid‐like to the solid‐like response at low frequencies, has been previously documented for CNTs composites as well as for nanocomposites containing carbon nanofibers , layered silicates composites , graphene , carbon black , and for thermotropic liquid crystalline polymers . Compared to traditional fillers , nanofillers reach the rheological percolation threshold at much lower concentrations, due to their high aspect ratio and high surface area that means contacts with polymer chains are much greater.…”

Section: Resultsmentioning

confidence: 95%

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Nobile

Valentino

Morcom

et al. 2017

Polymer Engineering & Sci

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The morphological, rheological and electrical properties of nanocomposites based on multi‐walled carbon nanotubes (MWNTs) and high density polyethylene (HDPE), prepared by melt mixing, have been investigated. The effects of temperature, MWNT concentration and nanotube surface treatment have been analyzed. A good dispersion of oxidized nanotubes in the HDPE matrix was found using electron microscopy investigations, as has also been found in the case of related nonfunctionalized MWNTs. The rheological oscillatory shear tests in the melt state have been carried out with strain amplitude values within the linear viscoelastic region. The rheological measurements on the nonfunctionalized MWNT/HDPEs revealed that the percolation threshold was temperature dependent with lower values at higher temperatures. At low frequencies, the oxidized MWNTs/HDPE composites showed storage modulus and complex viscosity values lower than the corresponding values measured for nanocomposites prepared with nonfunctionalized MWNTs. The conductivity decrease is more than 2 orders of magnitude for the sample with 2.5 wt% oxidized MWNTs, compared to the un‐oxidized comparator materials. A constant voltage, long‐term stability test allowed to estimate the average number of electrically active percolation paths and showed that stepwise conductivity loss is preceded by a strong increase in the noise amplitude related to the electrical current. POLYM. ENG. SCI., 57:665–673, 2017. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 95%

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Nobile

Valentino

Morcom

et al. 2017

Polymer Engineering & Sci

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“…Previous studies have demonstrated that elongational flow can actually modify the nanomorphology of polymer nanocomposites, enhancing exfoliation degree and promoting orientation along stretching direction [26][27][28]. Applied drawing can also induce clay-clay electrostatic interactions, which can translate into three-dimensional silicate arrangements and/or aggregation of the filler [24][25][26][27][28][29][30]. Moreover, in an our recent work the extensional behavior of copolyamide-based nanocomposites was analyzed and correlated to bubble stability in the film blowing processing of these materials [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of polymer/organoclay composition on morphology and rheological properties of polylactide nanocomposites

et al. 2015

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In this work the relationships between system composition, polymer–organoclay interaction, morphology and rheological response, under shear, and elongational flow, of different melt compounded polylactic acid (PLA)/organoclay nanocomposites are investigated, with the aim to properly select the better organoclay for a well-specified PLA grade and processing technology. Polylactide nanocomposites are prepared using two commercial polylactide grades (PLA 4032D and PLA 2003D) and two different organomodified montmorillonites (Cloisite 30B and Nanofil SE3010). FTIR analysis evidences the occurrence of stronger polymer/organoclay interactions for the system PLA4032D+C30B, resulting in a higher clay dispersion and exfoliation levels. Moreover, rheological tests at low shear rates show that, if PLA 2003D is used as polymer matrix (differing from PLA4032D by the presence of a high molecular weight tail), a better dispersed nanomorphology can be obtained with Nanofil SE3010, characterized by a double d-spacing compared to Cloisite 30B, despite the higher polar character of this latter nanofiller. On the other hand, elongational rheological measurements evidence for NSE3010-based hybrids a marked extensional thickening, whilst the stronger polar interactions between the phases in both the polylactide grades filled with C30B, determine increments in elongational viscosity, but inhibit the strain hardening behavior

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“…The color, represented as color difference Δ E *, was calculated as:

Δ E^{*} = {[{true(Δ L^{*} true)}^{2} + {true(Δ a^{*} true)}^{2} + {true(Δ b^{*} true)}^{2}]}^{1 / 2}

where Δ L *, Δ a *, and Δ b * are the differences between the color parameters of the samples and the white standard ( L * = 93.49, a * = −0.77, b * = 1.40) . L *, a *, and b * are parameters of the CIELAB system . In this system, L * represents lightness, and its value extends from 0 (black) to 100 (white); a * Indicates the color ranging from red to green; and b * indicates the color ranging from yellow to blue .…”

Section: Methodsmentioning

confidence: 99%

Thermoplastic biodegradable material elaborated from unripe banana flour reinforced with metallocene catalyzed polyethylene

Martı́nez

Méndez

Solís

et al. 2014

Polymer Engineering & Sci

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To meet the challenge of procuring new sources of natural polymers without affecting the demands for food crops, a thermoplastic unripe banana flour (TPF) was produced, characterized, and blended with metallocene‐catalyzed polyethylene (mPE). Both the pulp and peels of unripe banana were used to produce flour, whose stability and thermoplastic properties allowed blending with mPE in high proportions, that is, 50, 60, 70, and 80%. The blends were injection molded, and the thermal, mechanical, microstructural, and infrared spectral properties of the resulting samples were characterized. The blend containing 50% TPF yielded a robust, elastic, and nonbrittle material. Maleic anhydride grafting on mPE (mPE‐g‐MA) promoted interphase adhesion of the polymers and homogeneity in the blends. Grafting also influenced the mechanical, thermal, and microstructural properties of the blends. The characteristics of the blends make them ideal for designing biodegradable plastics while exploiting banana peels, which are usually considered agricultural waste. POLYM. ENG. SCI., 55:866–876, 2015. © 2014 Society of Plastics Engineers

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Effect of biaxial drawing on morphology and properties of copolyamide nanocomposites produced by film blowing

Cited by 25 publications

References 33 publications

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Effect of polymer/organoclay composition on morphology and rheological properties of polylactide nanocomposites

Thermoplastic biodegradable material elaborated from unripe banana flour reinforced with metallocene catalyzed polyethylene

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