Thermo-mechanical properties of high density polyethylene – fumed silica nanocomposites: effect of filler surface area and treatment

Dorigato, Andrea; D’Amato, Marianna; Pegoretti, Alessandro

doi:10.1007/s10965-012-9889-2

Cited by 75 publications

(68 citation statements)

References 39 publications

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“…On the other hand, as expected, at higher LDH content, the stiffening effect was also counterbalanced by a consistent and progressive reduction of tensile properties at break, in conformity to other literature data [12,45,46]. For instance the strain at break of plates decreased from about 1700% for HDPE plates to 380% for LDH-5.…”

Section: Mechanical Properties Of Plates and Fiberssupporting

confidence: 91%

“…On the other hand, the slow cooling applied for plates (about -20°C/min) determined a slow crystallization rate and hence the formation of more perfect crystals at higher melting temperature, from about 135°C (HDPE) up to 137°C (LDH nanocomposite). Literature data reported various effects of nanofiller on crystallization temperature and crystallinity content of polyethylene matrix, showing negligible [42], or significant [36,43] or small differences [12], in dependence on both processing and composition. In our case, the crystallinity of nanofilled polymer was found almost the same in the case of compression molded plates, whereas the final crystallinity of fiber slightly increased with LDH content, in direct conformity to the density measurements.…”

Section: Thermal Properties Of Plates and Fibersmentioning

confidence: 99%

“…With proper processing conditions, organically modified nanofiller can be melt-dispersed into polyolefins and exfoliated, while it is not very good as that observed in polyamides, polyurethanes, and some other polar polymers [5]. However, significant improvement of thermo-mechanical, flame retardant, barrier, rheological properties and frequently better thermoforming properties were observed in nanofilled polyethylene [6][7][8]12], polypropylene [10] and polybutene [11]. Some polyolefin nanocomposites have been also processed by melt spinning, that is the most common textile process [13].…”

Section: Introductionmentioning

confidence: 99%

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Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

Dabrowska¹,

Fambri²,

Pegoretti³

et al. 2013

Express Polym. Lett.

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Abstract.Organically modified hydrotalcite is a recent class of organoclay based on layered double hydroxides (LDH), which is anionically modified with environmental friendly ligands such as fatty acids. In this paper the influence of hydrotalcite compounded/dispersed by means of two different processes for production of plates and fibers of polyolefin nanocomposites will be compared. A polyethylene matrix, suitable for fiber production, was firstly compounded with various amounts of hydrotalcite in the range of 0.5-5% by weight, and then compression moulded in plates whose thermomechanical properties were evaluated. Similar compositions were processed by using a co-rotating twin screw extruder in order to directly produce melt-spun fibers. The incorporation of clay into both bulk and fiber nanocomposites enhanced the thermal stability and induced heterogeneous nucleation of polyethylene crystals. Hydrotalcite manifested a satisfactory dispersion into the polymer matrix, and hence positively affected the mechanical properties in term of an increase of both Young's modulus and tensile strength. Tenacity of nanocomposite as spun fibers was increased up to 30% with respect to the neat polymer. Moreover, the addition of LDH filler induced an increase of the tensile modulus of drawn fibers from 5.0 GPa (neat HDPE) up to 5.6-5.8 GPa.

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Section: Mechanical Properties Of Plates and Fiberssupporting

confidence: 91%

Section: Thermal Properties Of Plates and Fibersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

Dabrowska¹,

Fambri²,

Pegoretti³

et al. 2013

Express Polym. Lett.

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“…The effect of silica and zirconia nanoparticles on the microstructure of LLDPE nanocomposites synthesized via in situ polymerization with zirconocene was investigated by Jongsomjit et al [17], while Wang et al [18] analyzed the dispersion behaviour of titania (TiO 2 ) nanoparticles in polyolefin nanocomposites. In recent years an extended investigation was carried out by this research group on the viscoelastic and the fracture behavior of polyolefin based nanocomposites [19][20][21][22][23]. It was found that the addition of small quantities of fumed silica nanoparticles could substantially improve both the failure properties and the creep stability of the investigated matrices.…”

Section: Introductionmentioning

confidence: 99%

“…Nano-silica was able to promote lower crystal sizes and higher crystallinity with respect to the neat fibers, with a remarkable enhancement of their mechanical properties and beneficial effects on the interfacial adhesion with an epoxy matrix. In a preliminary work of this group [23], a high density polyethylene matrix was melt compounded with various untreated (hydrophilic) and surface treated (hydrophobic) fumed silica nanoparticles, having different surface areas. The homogeneous distribution of fumed silica aggregates at low filler contents led to remarkable improvements of the thermal stability and of the ultimate tensile mechanical properties, both under quasi-static and impact conditions.…”

Section: Introductionmentioning

confidence: 99%

High performance polyethylene nanocomposite fibers

D’Amato¹,

Dorigato²,

Fambri³

et al. 2012

Express Polym. Lett.

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Abstract.A high density polyethylene (HDPE) matrix was melt compounded with 2 vol% of dimethyldichlorosilane treated fumed silica nanoparticles. Nanocomposite fibers were prepared by melt spinning through a co-rotating twin screw extruder and drawing at 125°C in air. Thermo-mechanical and morphological properties of the resulting fibers were then investigated. The introduction of nanosilica improved the drawability of the fibers, allowing the achievement of higher draw ratios with respect to the neat matrix. The elastic modulus and creep stability of the fibers were remarkably improved upon nanofiller addition, with a retention of the pristine tensile properties at break. Transmission electronic microscope (TEM) images evidenced that the original morphology of the silica aggregates was disrupted by the applied drawing.

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Polymer Composites: Reinforcing Fillers

Pegoretti

Dorigato

2019

Encyclopedia of Polymer Science and Technology

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Addition of reinforcing fillers is a well‐established method to enhance mechanical, electrical, and thermal properties of plastics. Formulation and compounding of polymer matrices with inorganic and organic fillers having peculiar morphology enables the development of new multifunctional materials. Among the physical properties affected by the introduction of fillers in plastics, particular attention has been devoted to the mechanical behavior of the resulting composites. Moreover, introduction of inorganic fillers can reduce the cost of plastics, as they are sometime less expensive than polymers. It is well known that with a correct formulation and compounding, the tensile and impact strength and elastic modulus of polymers can be considerably enhanced, allowing to extend the application of plastics in technical fields previously undreamt of. Many other physical properties, such as friction coefficient, molding shrinkage, and weatherability, can be considerably affected by filler addition. This article aims at providing an overview of the various types of fillers available in the market to reinforce plastic products. After a general introduction, the article discusses both particulate microfillers as well as nanostructured fillers. For all the fillers considered, information on their morphological behavior, important physical properties, and production processes are provided. In addition, select examples of fillers’ effectiveness in improving the properties of polymer matrices (thermoplastic, thermosetting, and elastomers) are also presented.

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Thermo-mechanical properties of high density polyethylene – fumed silica nanocomposites: effect of filler surface area and treatment

Cited by 75 publications

References 39 publications

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

High performance polyethylene nanocomposite fibers

Polymer Composites: Reinforcing Fillers

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