Study of microstructure and flexural properties of microcellular acrylonitrile-butadiene-styrene nanocomposite foams: experimental results

In this paper, acrylonitrile-butadiene-styrene （ABS） nanocomposite foams are produced using carbon dioxide through the solid-state batch process. Microcellular closed-cell foams are produced with the relative density ranging from 0.38 to 0.97. The effects of the processing conditions on the density, morphology, and flexural properties of ABS and its nanocomposite foams are studied. It is found that nanoclay particles, as nucleating sites, play an important role in reducing the size of cells and increasing their number in the unit volume of foamed polymer, as well as increasing the flexural modulus of foam through reinforcing its matrix.

阻燃ABS树脂的发展现状与未来展望

首先对ABS树脂的性质、现状和阻燃的重要性进行了简要介绍。之后分别对溴系、磷系和无机金属化合物等阻燃剂在丙烯腈—丁二烯—苯乙烯三元共聚物(ABS)树脂中的应用现状及存在的问题进行了阐述,最后对今后阻燃ABS树脂的发展趋势进行了简单的分析和预测。

PHASE SEPARATION BEHAVIOR OF ACRYLONITRILE-BUTADIENE-STYRENE COPOLYMER INDUCED BY SURFACES OF VARIOUS POLYMERS

This paper reports the phase separation behavior of ABS films cast on the surfaces of homopelymers or random copolymers.It is found that phase separation of ABS films was induced by the surfaces of the substrate polymers.The relationship between the miscibility of the sub- strate polymers and the phase separation behavior of ABS films was also examined.

Effects of ABS-g-MAH on the properties of Nylon 6/ABS alloy

The alloy of Nylon 6/acrylonitrile-butadiene-styrene （ABS） was used for a compatibilizer to generate the maleic anhydride （ABS-g-MAH）, in which the proportion of PA6/ABS is 90/10. The results of the mechanical tests show that when the content of ABS-g-MAH is 20 %, the impact strength of the alloy with the compatibilizer increased by around 41%, compared with that of the PA6/ABS alloy; Besides, the tensile strength has been significantly improved. Furthermore, in accordance with the dynamic mechanical analysis, a relaxation temperature of Nylon 6 has raised from 70 ℃ to 110 ℃with the addition of ABS and ABS-g-MAH; moreover, and the obvious relaxations of β and 7 occur at about 60 ℃ and - 60 ℃, respec- tively. It can be seen from the scanning electron microscope （SEM） photographs that the compatibility has been improved through the addition of ABS-g-MAH. The water absorption of Nylon 6 has also been improved by the addition of ABS and ABS-g-MAH. When the content of ABS-g-MAH is 10%, the water absorption of the alloy will fall by 50%.

Investigation of tensile deformation behavior of PC, ABS, and PC/ABS blends from low to high strain rates

This paper experimentally studies the tensile deformation behavior of poly- carbonate （PC）, acrylonitrile-butadiene-styrene （ABS）, and PC/ABS blends （with the blending ratios of PC to ABS being 80：20, 60：40, 50：50, and 40：60） from low to high strain rates. Using the universal MTS-810 machine and the split Hopkinson tension bar （SHTB） testing system, the quasi-static and impact tension tests are carried out at the room temperature. The curves of the true stress and the true strain are obtained. The deformation behaviors of PC, ABS, and PC/ABS blends are characterized in detail. The linear relationship between the strain rate and the yielding stress is given.

A Study of Melt Flow Analysis of an ABS-Iron Composite in Fused Deposition Modelling Process

Fused deposition modelling (FDM) is a filament based rapid prototyping system which offers the possibility of introducing new composite material for the FDM process as long as the new material can be made in feedstock filament form. Swinburne has been undertaking extensive research in development of new composite materials involving acrylonitrile-butadiene-styrene (ABS) and other materials including metals. In order to predict the behaviour of new ABS based composite materials in the course of FDM process, it is necessary to investigate the flow of the composite material in liquefier head. No such study is available considering the geometry of the liquefier head. This paper presents 2-D and 3-D numerical analysis of melt flow behaviour of a representative ABS-iron composite through the 90-degree bent tube of the liquefier head of the fused deposition modelling process using ANSYS FLOTRAN and CFX finite element packages. Main flow parameters including temperature, velocity, and pressure drop have been investigated. Filaments of the filled ABS have been fabricated and characterized to verify the possibility of prototyping using the new material on the current FDM machine. Results provide promising information in developing the melt flow modelling of metal-plastic composites and in optimising the FDM parameters for better part quality with such composites.

Volatile Substances in Polymer Toys Made from Butadiene and Styrene

The residual levels and migration behavior of volatile substances were detected using HS-GC/MS for acrylonitrile-butadiene-styrene copolymer (ABS) toys, thermoplastic elastomer toys, and rubber toys made from 1,3-butadiene and styrene found on the Japanese market. The maximum residual level of these volatile substances was 2600 μg/g of styrene in ABS toys. In particular, the levels of known carcinogens 1,3-butadiene, benzene, and acrylonitrile are 5.3, 2.5 and 55 μg/g, which are much lower than the EU limit of 0.1%. Furthermore, some volatile substances migrated from ABS toys into water in amounts of 3 -40 ng/mL. Thermoplastic elastomer toys and rubber toys contained these volatile substances at significantly lower levels than ABS toys.

FINITE ELEMENT SIMULATION FOR YIELD STRESS OF HARD POLY(VINYL CHLORIDE)/ACRYLONITRILE-BUTADIENE-STYRENE BLENDS AT DIFFERENT CROSSHEAD SPEEDS

Hard poly（vinyl chloride） （PVC）/acrylonitrile-butadiene-styrene （ABS） blends were prepared using injection- molding and influence of crosshead speed on mechanical properties was examined. Based on morphology parameters obtained from transmission electron microscopy photography and the material parameters from true stress-strain curves of neat PVC and ABS, yield stresses of the blends at different crosshead speeds were simulated employing a two-dimensional nine-particle model based on the finite element analysis （FEA）. The FEA results were compared with the experimental yielding stress and the good agreement validated the simulation approach. The FEA approach allowed establishing a yielding criterion related to local yielding of the interstitial matrix between ABS particles.