Investigation on phosphorus halogen‐free flame‐retardancy systems in short glass fiber‐reinforced PC/ABS composites under rapid thermal cycle molding process condition

Abstract

In this study, standard test specimens with flameretarded short glass fiber-reinforced PC/ABS materials were fabricated under rapid thermal cycle injection molding condition by selecting a potassium perfluorobutane sulfonate flame retardant specially used for PC, FR2025, and two kinds of aryl phosphorus halogen-free flame retardants, UN707 and PX-220. The flame-retardancy effect of the above different flame retardants on the studied systems was compared through combustion tests of the specimens. Meanwhile, the thermal and mechanical properties of flame-retarded composites were studied by using the thermogravimetry analysis, dynamic mechanical thermal analysis (DMTA), and universal testing machine. The results show that the "candlewick effect" of fibers exacerbates the fire behavior of composites. With the increase of the aryl phosphorus halogen-free flame retardants, the flame-retardancy effect of composites is obviously improved, and the maximum thermal degradation rate of composites is significantly decreased. The UL94 combustion rating is improved, and the time of residual flame is substantially reduced with the increase of PC content under the same content of flame retardant. The DMTA results show that the flame retardants have a reinforcement action on PC/ABS matrix. However, the macroscopic mechanical properties are slightly decreased in the glass fiber-reinforced composites because of the destructive effect of the flame retardants on the interface compatibility between matrix and fibers; the scanning electron microscopic micrographs of tensile fracture fully prove this action mechanism of flame retardants. In addition, the addition of toughener and antidripping additive significantly affects the flame retardancy and mechanical properties of composites. POLYM. COMPOS., 00:000-000, 2014.

Influence of phosphorous‐based flame retardants on the mechanical and thermal properties of recycled PC/ABS copolymer blends

“…E ’ at 30 °C of r‐PC/r‐ABS/FR blends are higher than E ’ of r‐PC/r‐ABS blend (Table ), suggesting a reinforcing effect of the FRs BDP, TPP, and OPE at this temperature, which is characteristic of better compatibility and miscibility of phases ascribed to improved interactions between constituents of blends. Such an effect was already reported for virgin PC/ABS blends with 10 wt % of aryl phosphates, phosphorus‐containing POSS/PC composites, and short glass fiber‐reinforced PC/ABS composites with phosphorus‐based FRs …”

“…Wang et al . reported that the addition of FRs reduced the impact strength of a virgin short glass fiber‐reinforced PC/ABS blend although the SAN phase in ABS contributed to the impact strength of PC/ABS, but the compatibility of FRs and SAN was poor . In our case, the addition of 5 wt % MBS to r‐PC/r‐ABS highly improved impact strength and the test specimens did not break.…”

“…This can be explained by lower melting points of FR than r‐ABS and r‐PC, their partial dissolution in r‐PC/r‐ABS blend upon heating, and, consequently, improved miscibility of r‐PC/r‐ABS blend, manifested by lowered T g of the PC phase in r‐PC/r‐ABS/FR blends. The increase in storage modulus at 30 °C is related to increased rigidity of r‐PC/r‐ABS/FR blends because of restricted mobility of polymer chains due to improved interfacial adhesion among FR, r‐ABS, and r‐PC, as shown from tan δ values. The impact modifier MBS also shows a slight reinforcing effect by increasing E ′ at 30 °C of r‐PC/r‐ABS/MBS from 1.93 to 2.08 GPa.…”

Potential of Rapid Tooling in Rapid Heat Cycle Molding: A Review

“…Studies have shown that, by using the RHCM process to eliminate weld lines, the surface roughness of molded parts can be significantly reduced. As a result, processes such as spraying and coating can be eliminated, reducing energy, material, and production costs while also protecting the environment [ 55 , 56 , 57 , 58 ]. Thus, it is being considered as a possible manufacturing technology in the plastic injection molding industry.…”

Optimization of welding parameters of hot plate welded PC/ABS blends by using the Taguchi experimental design method

“…For example, Khan et al 11 investigated the rheological and mechanical properties of the PC/ABS blends so as to develop alloys comprising as much recycled plastics as manufacturable. Wang et al 12 evaluated the flame-retardant effect of the various flame retardants and fibers in the short glass fiberreinforced PC/ABS composites. The mechanical behavior of PC/ABS blends was also studied experimentally during monotonic and cyclic loading by Wang et al 13 Wegrzyn et al 14 reported the quality of morphology and mechanical behavior of PC/ABSmultiwalled carbon nanotube (MWCNT) nanocomposites with different volume fractions of carbon nanotubes manufactured at different injection velocities.…”