In the published article cited above, the following error was discovered.The journal citation was incorrectly cited as: 8. Guo, H.; Nadella, K.; Kumar, V. J. Mater. Sci. 2013, 28, 2374 Below is the correct citation information: 8. Guo, H.; Nadella, K.; Kumar, V.

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In this article, the general-purpose polystyrene was reprocessed four times. The effect of repeated reprocessing of polystyrene on its polymeric properties and on its microcellular, foaming behaviour were investigated. It was observed that reprocessing leads to break of long polymeric chains into short chains, which resulted increment in PDI and MFI. Molecular weight and Glass transition temperature were found to decrease with increasing recycling stages. Reprocessing resulted abruptly decrement in viscosity of neat polystyrene. Effect of reprocessing on foaming behaviour was analysed properly in this report and it was found that reprocessing resulted in improvement in cell sizes and their distribution. A positive effect on expansion ratio was also observed during foaming of reprocessed specimens. Cell density was found to decrease with increasing recycling stages. The effect of saturation pressure and foaming temperature on microcellular foam morphology along with recycling were investigated. Effect of foaming time on cell size, cell size distribution, cell density, expansion ratio and cell wall thickness was investigated.

In this study, the influence of field distribution of ultrasonic waves on the manufacturing of microcellular Acrylonitrile-Butadiene-Styrene (ABS) foam was investigated. In the primary studies, Aluminum foil erosion tests were performed to analyze the spatial field distribution of ultrasonic waves throughout the water bath. It was found that there exists a critical effective distance from the ultrasonic transducer where the maximum cavitation intensity can be achieved. Prior to and beyond this critical effective distance, the cavitation intensity reduces drastically. In the succeeding study, gas saturated polymer pellets were placed inside the ultrasound medium at various effective distances from the transducer for a predefined amount of treatment time and then were microcellular solid-state batch foamed. Intense cell nucleation phenomenon was observed in samples sonicated at the critical effective distance, while at other distances a very mild increment in cell density was observed. The expansion ratio and cell morphology was also found to be significantly affected by the relative placement of gas-saturated polymer with respect to the transducer in sonication medium.

In this work, microcellular acrylonitrile-butadiene-styrene foams were developed with utilization of water as a co-blowing agent and CO2 as the primary blowing agent through the solid-state batch foaming process. The effect of saturation parameters with the content of the co-blowing agent has been studied extensively for various foaming attributes. The co-blowing agent enhanced the average cell size and the expansion ratio which are useful for better thermal insulation. The maximum expansion ratio of 29.9 obtained from the effect of saturation temperature and co-blowing agent, 23.6 from the effect of saturation pressure and co-blowing agent, and 22.4 from the effect of saturation time and co-blowing agent. The co-blowing agent significantly affects the cell morphology of polymeric foam with saturation parameters.

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The lightweight products with superior specific strength are in great demand in numerous applications such as automotive, aerospace, biomedical, sports, etc. This work focussed on the manufacturing of lightweight products using the cellular three dimensional (3D) printing process. In this work, the continuous microcellular morphology has been developed in a single foamed filament using 3 D printing of carbon-di-oxide (CO2) saturated acrylonitrile butadiene styrene (ABS) filaments. The microcellular structures with average cell size in the range of 6–1040 µm were developed. The influence of printing parameters; nozzle temperature, feed rate, and flow rate on the foam characteristics and cell morphology at different levels were investigated. The different kinds of observed foamed extrudate irregularities were discussed.