Influence of filler structure on microhardness of carbon black–polymer composites

Abstract

The microhardness, H, of carbon black-polycarbonate and carbon blacklow-density polyethylene composites was investigated. Two types of microadditives with different average particle sizes were employed. It has been shown that the morphology of the polymeric matrix conspicuously influences the hardness dependence of the composites with volume concentration of filler, . The microhardness of the carbon black-polycarbonate composites shows a steplike behavior with respect to carbon black content, while the H value of the carbon black-low-density polyethylene composite linearly increases with increasing . The influence of filler structure on the microhardness of the carbon black-polymer composites is also discussed. Results favor the concept that a smaller carbon black particle size (smaller aggregate diameters and interaggregate distances) enhances the microhardness of the composites.

Nonisothermal Crystallization Kinetics and Microhardness of PP/CNT Composites

“…[22] The influence of filler structure on microhardness of carbon black-polymer composites has been studied. [23] Results favour the concept that a smaller carbon black particle size enhances composite microhardness. [23] The present study deals with investigations on the crystallization behaviour of the PP/CNT nanocomposites under nonisothermal conditions.…”

“…[23] Results favour the concept that a smaller carbon black particle size enhances composite microhardness. [23] The present study deals with investigations on the crystallization behaviour of the PP/CNT nanocomposites under nonisothermal conditions. The aim was to evaluate the influence of the presence and the concentration of the CNT on the kinetic parameters of nonisothermal crystallization of three types of polypropylene matrixes.…”

Ferroelectric nanomesa formation from polymer Langmuir–Blodgett films

“…3,21 Although the paraelectric phase is crystalline, the bond fluctuations 16,22 may provide enough free volume for plastic flow 23 necessary to reorganize the film. 17,18 This dynamical picture resembles the "condis" (conformational disorder) phase, [23][24][25][26] which would also explain the effectiveness of annealing VDF copolymers in the paraelectric phase, but not in the all-trans ferroelectric phase, which has a static all-trans conformation. 3,16 The ferroelectric-paraelectric phase transition was evident in capacitance peaks at 63± 3°C on heating and 51± 2°C on cooling (Fig.…”

“…Second, the formation mechanism appears to involve crystalline plastic flow, not fluid flow, as the film restructuring occurs only in the crystalline paraelectric phase. Plastic deformation of crystalline polymers is usually associated with dislocations moving parallel to the polymer chains, 17,18 whereas the circular shape of the nanomesa belies a more isotropic process.…”

Effect of Morphological Features and Surface Area of Hydroxyapatite on the Fatigue Behavior of Hydroxyapatite−Polyethylene Composites

“…19 A decrease in particle size enhances the microhardness, Young's modulus, and flexural modulus of the composite. [20][21][22] Particle size distribution and filler morphology were found to influence mechanical properties. 15,17,23 Cheang and Khor reported that fillers with rough surfaces promote mechanical interlocking and improve interfacial bonding, resulting in higher tensile modulus than powders with smooth surfaces.…”