Rheological behaviors of plasticized polyvinyl chloride thermally conductive composites with oriented flaky fillers: A case study on graphite and mica

Abstract

In this study, two oriented flaky fillers in plasticized polyvinyl chloride (P‐PVC) matrix were respectively compared on some rheological behaviors such as dynamic rheological behavior, melt flow rate, and Barus effect. By comparing and analyzing the rheological behaviors and thermal conductivity of P‐PVC/graphite and P‐PVC/mica composites with oriented fillers, it is found that the P‐PVC/graphite composites have obvious percolation thresholds of viscosity, modulus and thermal conductivity at 23.6 vol%. However, P‐PVC/mica composites did not show similar phenomenon. Moreover, the variable parameter K′ in the modified Kerner–Nielson equation was used to relate the rheological behavior, percolation concentration and thermal conductivity of the composites, and the formation of the filler network was analyzed through the rheological behavior to explain the influence of the percolation threshold in the composites caused by the change of internal structure on the thermal conductivity. It has important guiding significance for the mechanism research and comprehensive performance improvement of the filled composites.

Fabrication and Characterization of Al2O3-Siloxane Composite Thermal Pads for Thermal Interface Materials

“…In epoxy-resin composites, A fillers increase the strength and elastic modulus of materials for product molding [1 However, there are several challenges that are encountered when adding Al2O3 pow as a filler during the fabrication of thermal pads, such as molding failure and decrea rheological behavior of the Al2O3 paste. Therefore, numerous studies have investiga the material properties of the Al2O3 filling powder, including the particle size, sh crystalline phase, polydispersity of particle size distribution, and elemental composit which significantly influence the characteristics of Al2O3 pastes [5][6][7][8].…”

Recent advances in polyvinyl chloride (PVC) recycling

“…Notably, plasticizers lower the melting point of PVC, complicating uniform melting and homogenization 65 . Additionally, plasticizers influence PVC's rheological behavior, affecting its viscosity and flow characteristics 66 . These alterations necessitate careful consideration when designing recycling methods for PVC materials, including the selection of appropriate recycling techniques and potential strategies to mitigate the challenges posed by plasticizers, ensuring the efficient and sustainable recycling of PVC 67 …”

Poly Vinyl Chloride Additives and Applications-A Review

“…Dioctyl Phthalate (DOP) is the most common plasticizer used in medical industry due to its high efficiency, availability at high purity and low cost. Other plasticizers such as tri, (2-ethyl hexyl) mellitate (TEHM, also called TOTM), n-butyrul, tri n-hexyl citrate (BTHC) and di (n-decyl), phthalate (DnDP) is used for other medical applications such as the platelets storage [21,22].…”

“…The released HCL causes the PVC degradation. The PVC exposure to the UV radiations dissociate the polymer chains but its impact is lesser than the heat degradation [22,23].…”