Morphology and mechanical behaviors of rigid organic particles reinforced polycarbonate

Abstract

For the purpose of promoting mechanical properties of bisphenol-A polycarbonate (PC) reinforced by rigid organic styrene-acrylonitrile copolymer (SAN) particles, styrene/acrylonitrile/glycidyl methacrylate terpolymer (SAG) was synthesized and applied as compatibilizer for PC/SAN blends. It is found that the phase morphology of PC/SAN/SAG blends is closely related with their mechanical properties. Large continuously distributed SAN phase or spherical dispersed SAN particles with average diameter over 2 μm tend to trigger premature tensile failure of blends due to stress concentration. The incorporation of SAG can simultaneously reinforce and toughen PC/SAN blends by controlling the size and distribution of the dispersed SAN particles. For the blends with fixed PC/SAN ratio, the elongation at break and fracture energy are markedly improved when SAN domain size is reduced by adding appropriate amount of SAG. Typically, for blends with a PC/SAN ratio of 75/25, adding 3 wt% SAG will cause the average diameter of SAN particles to reduce from 2.35 ± 1.20 to 0.74 ± 0.25 μm, meanwhile up to 95% increment in elongation at break and 115% increment in fracture energy is achieved.

Synergistic improvement of mechanical and thermal properties in epoxy composites via polyimide microspheres

“…To date, many researches have shown that organic particles have several distinct modes to toughen the brittle polymer matrix 51,52 . Some important factors are also related to the fracture behavior of particle‐polymer composites such as particle‐matrix interface bonding strength, particle size and volume fraction, particle modulus and ductility 53 .…”

Recent advances in fire‐retardant carbon‐based polymeric nanocomposites through fighting free radicals

“…This is particularly important for the polymers, such as EP, PET, PC, PU, UP etc. that do not experience a free‐radical pyrolysis process 159–162 . In particular, free radical capturers can be designed by integrating the gas and condensed phase mechanisms.…”

“…that do not experience a free-radical pyrolysis process. [159][160][161][162] In particular, free radical capturers can be designed by integrating the gas and condensed phase mechanisms. For example, regarding EP and polyesters, the scavengers are more efficient for the LOI and UL-94 tests but will only lead to limited heat release reductions.…”

Fabrication and Characterization of Aluminum Nanoparticle-Reinforced Composites

“…To confirm the microstructure morphology of the nanocomposite, a scanning electron microscope (SEM, S-4700, Hitach, Tokyo, Japan) was used to observe the dispersion of nanoparticles in the sample. The thermal properties of the samples were measured using differential scanning calorimetry (DSC, Q2000 system, TA instrument, New Castle, DE, USA) [21][22][23][24][25][26]. Stopping and range of ions in matter (SRIM) simulation was performed to estimate the thickness of the ion beam penetration into the composite, and ion beam injection was performed at different flow rates/energies using two ion species (N and Cr) at room temperature.…”