Properties Of High Impact Polystyrene Research Articles

Mechano-chemical surface modification of calcium carbonate particles by polymer grafting

Mechanical energy released during stirred grinding of calcium carbonate particles can promote the polymerization reactions of styrene monomers on particle surfaces, allowing us to obtain modified calcium carbonate particles by polymer grafting with less initiating reagent for reducing reaction time. This paper investigates the process of polymer grafting modification activated by mechano-chemical effects, the changes of mechanical and fluid properties of High Impact Polystyrene (HIPS) plastics with modified calcium carbonate fillers, the interactions between the modifying reagents and the surface of the filler particles and the action of the mechano-chemical effect in polymer grafting modification.

815 耐衝撃性ポリスチレンの力学的性質に及ぼすシリコーンオイル添加の影響

Tensile and Izod impact tests were used to evaluate effect of silicone oil on mechanical properties of high impact polystyrene (HIPS). Two types of HIPS were used for the study. One contains core-shell type particles with average diameter of 0.4 μm (0.4CSL), and the other salami type particles with average diameter of 1.0 μm (1.0SH). Results show that by adding the silicon oil, total fracture energy for 0.4CSL was increased only at the addition of 0.5 wt% under tensile test, but decreased under Izod impact test; while for 1.0SH the addition of silicone oil increased total fracture energy for both tensile and Izod impact tests. The study also included deformation analysis using optical microscopy. In this paper, the relationship between the fracture energy and the size of the whitening zone is discussed.

Effect of Styrene-Butadiene-Styrene Block Copolymer on Dynamic-Mechanical Properties of High-Impact Polystyrene

For the selection of the polymer materials and polymer blends for various fields of applications, dynamic-mechanical properties, the primary viscoelastic functions as well as the stability of materials on different loads are very important. Since polymer materials are viscoelastic, their mechanical properties are dependent on temperature and time. The dynamic-mechanical properties of high-impact polystyrene, (PS-HI) and blends of PS-HI and styrene-butadiene-styrene block copolymer, (SBS) were investigated. Under the conditions of dynamic-mechanical load, the investigated systems will have different behavior due to the various content of the hard phase, polystyrene and soft phase, polybutadiene. The investigations were done by DMA analysis. The primary viscoelastic functions were determined. The influence of the constant stress on the strain and moduls at various temperatures was examined. The effects of the time on moduls changes was obtained by generating the master curves. The viscoelastic functions and the stability on the constant load, the changes of the moduls with time and temperature depend on the amount of polystyrene in the examined copolymers and blends. This investigation presents the possibility of predicting a useful lifetime of materials.

Empirical Modelling of the Tensile Properties of High Impact Polystyrene in Terms of Its Secondary Phase Morphology

Empirical Modelling of the Tensile Properties of High Impact Polystyrene in Terms of Its Secondary Phase Morphology

Influence of the microstructural morphology on the mechanical properties of high-impact polystyrene

The stress-strain and dynamic mechanical curves and impact strength of different high-impact polystyrenes (HIPS) have been studied as a function of their microstructure. We have found that the values of the Young and dynamic moduli are very similar since damping of these materials is minor at room temperature. Also, we have found that both moduli depend on particle volume fraction. The impact strength improves to a larger extent with the incorporation of polybutadiene into polystyrene. However, this improvement depends also on the morphology of the material. The impact strength is affected largely by the rubber particle size. We have found that the impact energy absorbed is proportional to the ligament area.

Effect of Triaryl Phosphate, Zinc and Zinc Borate on Fire Properties of High Impact Polystyrene and High Impact Polystyrene-Polyphenylene Oxide Blend (Modified-Polyphenylene Oxide

Samples of m-PPO (virgin and flame retarded) and high impact polystyrene blended with zinc and zinc borate (2ZnO·3B2O3·3.5H 2O), were pre pared. The effect of triaryl phosphate on the flame retardancy of PPO-HIPS in conjunction with zinc and zinc borate was studied. For polystyrene zinc borate shows some reduction in smoke generation. Zinc, however does not show any effect on smoke generation for high impact polystyrene. Triphenyl phosphate shows minimal flame retardancy in HIPS which is not enhanced by zinc. Addition of zinc gives an increase in oxygen index for FR m-PPO, whereas zinc borate decreases the OI values. Zinc borate may sequester triaryl phos phate and thus eliminate its vapor phase activity. Zinc borate shows a signifi cant reduction in smoke generation and rate of heat release for m-PPO.

The effect of rubber particle size on the impact properties of high impact polystyrene (HIPS) blends

AbstractThe impact fracture of nominally identical high impact polystyrene resins having different and well‐characterized rubber particle size distributions is discussed. A numerical model for craze termination is presented and its predictions are compared with experimental data. An alternative explanation for the observed effect of particle size on fracture energy is considered.

The continuous measurement of the damping and fatigue properties of high‐impact polystyrene with a controlled‐amplitude torsion pendulum

AbstractTorsional damping and fatigue studies were made on high‐impact polystyrene using a controlled‐amplitude, continuously recording torsion pendulum. The damping behavior was measured as a function of the angular displacement, axial tensile stress, and the number of repeated cycles. At a critical axial tensile stress, the damping behavior changed from amplitude‐independent to amplitude‐dependent behavior. Damping measurements on high‐impact polystyrene specimens that had been previously crazed in tension showed that both the damping and the tensile stress necessary to produce amplitude‐dependent damping varied with the orientation of the craze. Repeated cycling of HIPS specimens produced crazing and amplitude‐dependent damping at a tensile stress below that expected from simple static tensile loading. Scanning electron micrographs of fracture surfaces from these specimens revealed that the rubber particles could be clearly distinguished from the surrounding matrix.