); rzeczkowski@ipfdd.de (P.R.) Mussel-inspired approach was attempted to non-covalently functionalize the surfaces of boron nitride (BN) with self-polymerized dopamine coatings in order to reduce the interfacial thermal barrier and enhance the thermal conductivity of BN-containing composites. Request PDF | On Feb 15, 2014, D.S. Thermal conductivity is a material property that describes ability to conduct heat. Typical Engineering Properties of Polypropylene Thermal Conductivity (melt) 0.16 W/m /°K Coefficient of Linear Thermal Expansion -Homopolymer 4 - 6 x 10-5 in/(in °F) 8 - 10 x 105 cm/(cm °C) Copolymer 3 - -5 x 10-5 in/(in °F) 6 - 9 x 105 cm/(cm °C) Shrinkage Homopolymer 0.018 – 0.020 in/in 0.046 – 0.051 cm/cm [60] functionalized the surfaces of micrometric BN with a thin layer of polydopamine coatings (f-BN). Polypropylene (PP) being one of the most widely used polymer materials in many fields of modern technology has some well-known disadvantages when it comes to its thermal conductive properties. The effect of acting pressure on TC of polypropylene seemed to be always positive, probably for the induced stress in a longitudinal direction that led to anisotropy of the tested feature. <> All content in this area was uploaded by Antonella Patti on May 06, 2020 . … The association of these fillers in the matrix appeared always more effective in improving the tested feature compared to the potential of each single species. The size and shape of particles, their orientation and distribution in the polymer, the interfacial interaction between filler and matrix and between filler and filler, have been identified as crucial aspects in the optimization of final heat transport in the polymeric composites. The thermal and electrical behaviour of PP matrix filled with two of copper particles (in micron dimensions), was investigated by Boudenne et al. Conversely, the introduction of ceramic fillers allowed acting on heat transfer of the neat matrix without compromising the electrical insulation of the starting material [39]. In the modern car engine, the electronic control unit (ECU) involves both hardware and software, required to perform the functions as mixture formation, combustion and exhaust gas treatment. This approach is considered a successful tool for improving the compatibility and wettability between the two phases of the composite system, and affecting positively the dispersion and the interfacial resistance. [49] added different micro-size particle of magnetite in various proportions to a standard polypropylene copolymer. In this case, when heat flows normally from a hotter body to colder one, interstitial spaces between contact points limit the thermal conduction that takes place only between effective connections. The principal difference concerns the replacement of the main heater with heat flux sensor (HFT) [12]. At a maximum of filler content (50% in vol.) In automobile components, an improved TC of the constituent materials for engine cover, radiator, and coolant reservoir could be convenient to promote the faster diffusion of the heat, in order to avoid the overheating of the overall system and compromise the respective performances. Ren et al. We are IntechOpen, the world's leading publisher of Open Access books. In the FM (Figure 2c), a short but intense energy pulse is sent to one side of the sample and the temperature increase is measured on the opposed side in function of time. These studies confirmed that, as the hydrostatic pressure increased on melt state, also the TC of thermoplastics in general, and of PP in particular, increased for a reduction in free volume. The functionalization, i.e., the introduction of functional groups on filler surface, obtained by covalent or non-covalent means, is a common approach widely adopted for changing the chemistry of inert inorganic particles. Cheewawuttipong et al. Based on the geometric characteristics, three groups of nanosize particles are distinguished: one-dimensional (nanotubes and nanofibres), two-dimensional (layered minerals), three-dimensional (spherical particles).