Use of nanoparticles for improving the foaming behaviors of linear PP

Zheng, Wenge; Lee, Y. H.; Park, C. B.

doi:10.1002/app.32253

Cited by 116 publications

(109 citation statements)

References 18 publications

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“…The blend of TPO shows a marginal increase in melting point due to nanoclays and further increase of compatibiliser [23][24][25]. The melting point slightly increased in the case of treated nanoclay in TPO matrix due to the reinforcing and/or nucleating effect.…”

Section: Dsc and Tgamentioning

confidence: 99%

Polypropylene-blended organoclay nanocomposites – preparation, characterisation and properties

Nalini

Nagarajan

Reddy

2012

Journal of Experimental Nanoscience

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Intercalated/exfoliated nanocomposites of thermoplastic polyolefin (TPO) blended nanoclay (Cloisite 20 A and Cloisite 30B) were fabricated using melt extrusion process. Polypropylene grafted maleic anhydride (PP-g-MA) was used as a compatibiliser to improve the dispersibility of clay. TPO/nanoclay composites were prepared with different percentages of clay loading (3, 5 and 7 wt%) by adding PP-g-MA as a compatibiliser. The nanocomposites having 5 wt%C20A/5 wt% compatibiliser exhibited a remarkable improvement in mechanical (tensile modulus, flexural modulus and impact strength) and thermal (heat distortion temperature, HDT) properties. The thermal measurements have been carried out by differential scanning calorimetry, thermogravimetric analysis and HDT methods. Dynamic mechanical analysis studies indicated that PP macromolecules were intercalated or exfoliated between the interlayer of silicates. The morphology of nanocomposites was characterised by scanning electron microscopy (SEM) and X-ray diffraction (XRD) was used to find out the arrangement of crystals in the nanocomposites. The SEM and XRD clearly demonstrated the progressive break up of particles and results in decreased particle size with the optimised combination.

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Section: Dsc and Tgamentioning

confidence: 99%

Polypropylene-blended organoclay nanocomposites – preparation, characterisation and properties

Nalini

Nagarajan

Reddy

2012

Journal of Experimental Nanoscience

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“…Regardless the aforementioned handicaps, both linear and highly branched PP grades have been foamed with more or less success using different foaming processes such as extrusion, compression moulding, injection moulding or batch foaming [2,3,[5][6][7][8][9][10][11]. Nonetheless, when the final application of the foamed part requires a certain final shape, the number of suitable foaming processes becomes limited.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature it is possible to find examples of extruded PP foams; they can be classified in two types, low density foamed sheets [2,3] or foamed filaments, [6,7,[9][10][11]. Low density extruded sheets can be shaped by thermoforming but the need for a secondary process can contribute to increase the cost of the final part and thermoforming is only limited to simple shapes.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, by filling PP with inorganic compounds such as talc or nanoparticles [10][11][12] and on the other hand by using special PP grades known as high melt strength PPs, on which by promoting a high degree of branching the melt strength is significantly increased [6,11,13]. Finally the less desirable solution because turn the polymer non-recyclable, is crosslinking the PP matrix [1].…”

Section: Introductionmentioning

confidence: 99%

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Moulded polypropylene foams produced using chemical or physical blowing agents: structure–properties relationship

et al. 2012

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Polypropylene (PP) foams have become\ud essential items due to their excellent properties. Nevertheless,\ud obtaining net-shaped PP foams with medium relative\ud densities is a complicated issue. In this article, two\ud processes able to produce moulded PP foams in this density\ud range are presented. One of them is based on a modification\ud of the pressure quench foaming method and therefore\ud uses a physical blowing agent (CO2). The second one is the\ud improved compression moulding technique which uses a\ud chemical blowing agent (azodicarbonamide). PP foams\ud with relative densities in the range between 0.25 and 0.6\ud and cylindrical shape were prepared using these foaming\ud techniques. A common PP grade (instead a highly branched\ud one) was used to obtain the samples, showing, that by\ud combining the appropriate foaming technique, the adequate\ud moulds, suitable blowing agent and proper foaming\ud parameters, net-shaped PP foams with excellent properties\ud can be produced starting from a conventional PP grade.\ud Samples were characterized by analyzing their cellular\ud structure and their mechanical properties. Results have\ud showed that depending on the chosen foaming route isotropic\ud or anisotropic structures with cell sizes ranging from 40 to 350 lm and open cell content in the range between 0\ud and 65% can be obtained. Moreover, mechanical properties\ud are highly influenced by the production route and chemical\ud composition of the foams. For instance, the stiffer materials\ud at relative densities higher than 0.4 are the ones produced\ud using the chemical blowing agent while at relative densities\ud lower than 0.4 are the ones produced using the physical\ud blowing agent.Peer ReviewedPostprint (published version

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“…The use of clay at lower contents in the foam formation also suppressed the cell coalescence, demonstrating that the nanocomposite is also favorable to produce foams [31].…”

Section: Polypropylene (Pp)mentioning

confidence: 95%

Polymer/ Clay Nanocomposites: Concepts, Researches, Applications and Trends for The Future

Anadão¹

2012

Nanocomposites - New Trends and Developments

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Use of nanoparticles for improving the foaming behaviors of linear PP

Cited by 116 publications

References 18 publications

Polypropylene-blended organoclay nanocomposites – preparation, characterisation and properties

Polypropylene-blended organoclay nanocomposites – preparation, characterisation and properties

Moulded polypropylene foams produced using chemical or physical blowing agents: structure–properties relationship

Polymer/ Clay Nanocomposites: Concepts, Researches, Applications and Trends for The Future

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