Preparation and properties of thermally conductive polypropylene composites

Standau, Tobias

doi:10.3139/o999.020616

Cited by 7 publications

(5 citation statements)

References 37 publications

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“…The values of the thermal conductivity of each material are given in the experimental section. In a study by Standau et al [52] on PP-based composites filled with boron nitride particles, the calculated thermal conductivity values were close to the experimental results, suggesting that the Hatta model can provide reliable values.…”

Section: Resultssupporting

confidence: 60%

Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

2019

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Melt-mixed composites based on polypropylene (PP) with various carbon-based fillers were investigated with regard to their thermal conductivity and electrical resistivity. The composites were filled with up to three fillers by selecting combinations of graphite nanoplatelets (GNP), carbon fibers (CF), carbon nanotubes (CNT), carbon black (CB), and graphite (G) at a constant filler content of 7.5 vol%. The thermal conductivity of PP (0.26 W/(m·K)) improved most using graphite nanoplatelets, whereas electrical resistivity was the lowest when using multiwalled CNT. Synergistic effects could be observed for different filler combinations. The PP composite, which contains a mixture of GNP, CNT, and highly structured CB, simultaneously had high thermal conductivity (0.5 W/(m·K)) and the lowest electrical volume resistivity (4 Ohm·cm).

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Section: Resultssupporting

confidence: 60%

Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

2019

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“…1.2 W∕mK and 1.435 W∕mK) 38 and they are not expected to restrict the heat flux when mixed with a much lower thermal conductive material like PP, both in the solid and in the molten state (ca. < 0.24 W/mk) 39 . In fact, SiO2 has been used to increase somewhat the thermal conductivity other polymer materials like epoxy resins 40 .…”

Section: Thermal Stability Under N2mentioning

confidence: 99%

Effect of mesoporous SBA-15 silica on the thermal stability of isotactic polypropylene based nanocomposites prepared by melt extrusion

Barranco‐García

Cerrada

Ressia

et al. 2018

Polymer Degradation and Stability

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The influence of mesoporous SBA-15 on the thermal stability of nanocomposites with isotactic polypropylene has been evaluated in detail, both under inert and air conditions, by performing dynamic weight loss measurements and by tracking the evolution of degradation species in materials prepared by melt extrusion. A superior thermal stability has been found in the composites, both under nitrogen and air, compared with that observed in the pristine PP.An almost identical effect has been found under those two atmospheres, in spite that the mechanisms involved in both of them are completely different. The rheological characteristics of these materials turn out the driving aspect in the observed thermal behaviour, prevailing on other specific detrimental parameters.

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“…This process is illustrated for property values corresponding to polypropylene, which is the major semi-crystalline polymer that is thermoformed. It is assumed that the crystallinity of PP is 50%, [18] and the melting point and heat of melting of PP are taken to be 160 C and 150 J/g, respectively. Also, T 0 , the room temperature, is taken to be 25 C. Additives considered are again calcium carbonate and graphene.…”

Section: Thermoforming Of Semi-crystalline Polymersmentioning

confidence: 99%

Role of additives in influencing heating and melting of polymers during thermoforming

Garapati

Gupta

2022

Vinyl Additive Technology

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The heating stage in thermoforming of amorphous and semi‐crystalline polymers was analyzed for constant heat flux conditions using an energy balance model; candidate polymers were high impact polystyrene and isotactic polypropylene. Using an analytical solution, temperature differences as large as 100°C were predicted to arise between the surface and the interior of the sheet being thermoformed for conditions chosen in this work, and these can limit the heat flux being used. A Matlab program was used to compute temperature and crystallinity profiles for crystal melting. Melting took almost as much time as required to heat the surface of the film to the crystal melting point. High thermal conductivity additives, such as calcium carbonate and graphene, can provide temperature uniformity, and the additive uniformity can be verified using thermogravimetric analysis. The ability of these additives to provide temperature uniformity and to reduce energy consumption and heating time is determined in a quantitative manner. Both additives improve heat transfer, and, at the same added volume fraction, graphene is more effective. However, calcium carbonate has a lower cost. The role of density, specific heat, thermal conductivity, and amount of the polymers and additives in influencing temperature and crystallinity profiles was explored, and methods of carrying out thermoforming in an energy efficient manner are proposed.

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Preparation and properties of thermally conductive polypropylene composites

Abstract: The majority of polymers possesses low thermal conductivity and behaves as electrical insulators. In this work, the thermal conductivity of polypropylene (PP)

Cited by 7 publications

References 37 publications

Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

Thermal Conductivity and Electrical Resistivity of Melt-Mixed Polypropylene Composites Containing Mixtures of Carbon-Based Fillers

Effect of mesoporous SBA-15 silica on the thermal stability of isotactic polypropylene based nanocomposites prepared by melt extrusion

Role of additives in influencing heating and melting of polymers during thermoforming

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