Effect of crystalline structure on the cell morphology and mechanical properties of polypropylene foams fabricated by core‐back foam injection molding

2021 ◽  
pp. 51370
Author(s):  
Minghui Wu ◽  
Fei Wu ◽  
Qian Ren ◽  
Zhengsheng Weng ◽  
Haibin Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Crystalline Structure ◽  
Cell Morphology ◽  
Foam Injection Molding ◽  
Morphology And Mechanical Properties

Cell Morphology and Mechanical Properties of Rigid Polyurethane Foam

2005 ◽  
Vol 41 (3) ◽  
pp. 267-285 ◽  
Author(s):  
Michelle Cameron Hawkins ◽  
Brendan O’Toole ◽  
Dacia Jackovich
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Cell Morphology ◽  
Rigid Polyurethane Foam ◽  
Morphology And Mechanical Properties

Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology

2018 ◽  
Vol 37 (15) ◽  
pp. 1020-1034 ◽  
Author(s):  
Christoph Lohr ◽  
Björn Beck ◽  
Frank Henning ◽  
Kay André Weidenmann ◽  
Peter Elsner
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Injection Molding ◽  
Fiber Orientation ◽  
Polyphenylene Sulfide ◽  
Injection Molding Process ◽  
Fiber Reinforced ◽  
Molding Process ◽  
Glass Fiber Reinforced ◽  
Foam Injection Molding

The MuCell process is a special injection molding process which utilizes supercritical gas (nitrogen) to create integral foam sandwiches. The advantages are lower weight, higher specific properties and shorter cycle times. In this study, a series of glass fiber-reinforced polyphenylene sulfide foam blanks are manufactured using the MuCell injection molding process. The different variations of the process (low-pressure also known as structural foam injection molding) and high-pressure foam injection molding (also known as “core back expansion,” “breathing mold,” “precision opening,” decompression molding) are used. The sandwich structure and mechanical properties (tensile strength, bending strength, and impact behavior) of the microcellular and glass fiber-reinforced polyphenylene sulfide foams are systematically investigated and compared to compact material. The results showed that the injection parameters (injection speed, foaming mechanism) played an important role in the relative density of microcellular polyphenylene sulfide foams and the mechanical properties. It could be shown that the specific tensile strength decreased while increasing the degree of foaming which can be explained by the increased number of cells and the resulting cell size. This leads to stress peaks which lower the mechanical properties. The Charpy impact strength shows a significant dependence on the fiber orientation. The specific bending modulus of the high-pressure foaming process, however, surpasses the values of the other two processes showing the potential of this manufacturing variation especially with regard to bending loads. Furthermore, a high dependence of the mechanical properties on the fiber orientation of the tested specimens can be found.

Influence of graphene on the cell morphology and mechanical properties of extruded polystyrene foam

2015 ◽  
Vol 51 (4) ◽  
pp. 413-426 ◽  
Author(s):  
Chimezie Okolieocha ◽  
Thomas Köppl ◽  
Sabrina Kerling ◽  
Folke J Tölle ◽  
Amir Fathi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Morphology ◽  
Polystyrene Foam ◽  
Extruded Polystyrene Foam ◽  
Morphology And Mechanical Properties

Cell morphology and mechanical properties of microcellular mucell®injection molded polyetherimide and polyetherimide/fillers composite foams

2013 ◽  
Vol 130 (6) ◽  
pp. 4171-4181 ◽  
Author(s):  
Jingli Li ◽  
Zhenglun Chen ◽  
Xianzhong Wang ◽  
Tao Liu ◽  
Yufeng Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Morphology ◽  
Composite Foams ◽  
Injection Molded ◽  
Morphology And Mechanical Properties

Super polyolefin blends achieved via dynamic packing injection molding: the morphology and mechanical properties of HDPE/EVA blends

Polymer ◽  
2002 ◽  
Vol 43 (26) ◽  
pp. 7367-7376 ◽  
Author(s):  
Bing Na ◽  
Qin Zhang ◽  
Qiang Fu ◽  
Gong Zhang ◽  
Kaizi Shen
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Polyolefin Blends ◽  
Morphology And Mechanical Properties

Cell wall components, cell morphology, and mechanical properties of peach slices submitted to drying

2019 ◽  
Vol 38 (13) ◽  
pp. 1776-1789
Author(s):  
Chunju Liu ◽  
Jiaxin Liu ◽  
Dajing Li ◽  
Chunquan Liu ◽  
Zhongyuan Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Cell Morphology ◽  
Cell Wall Components ◽  
Wall Components ◽  
Morphology And Mechanical Properties

Effect of processing condition on properties of polylactic acid parts obtained by foam injection molding

2016 ◽  
Vol 53 (5) ◽  
pp. 491-502 ◽  
Author(s):  
Valentina Volpe ◽  
Roberto Pantani
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Polylactic Acid ◽  
Flow Rate ◽  
Flexural Modulus ◽  
Processing Condition ◽  
Blowing Agent ◽  
Injection Flow Rate ◽  
Injection Flow ◽  
Foam Injection Molding

Foam injection molding is a processing technology particularly interesting for biodegradable polymers, which present a very narrow processing window, with the suitable processing temperatures close to the degradation conditions. The addition of a physical blowing agent, besides decreasing the final part weight, reduces both the viscosity and the glass transition temperature of the polymer melt, allowing the processability of these materials at lower temperatures. In this work, structural foams of polylactic acid with nitrogen as physical blowing agent were obtained by foam injection molding. In particular, the effects of back pressure, namely the pressure imposed inside of the cylinder when the screw is returning back to prepare a new amount of material to be injected, and of the injection flow rate on foaming and mechanical properties of the molded parts was assessed. It was found that the samples molded adopting a higher injection flow rate are shorter than those injected at lower flow rate, and this result was ascribed to the large compressibility of the injected shot. As far as the mechanical properties of the foamed parts, it was found that the modulus decreases with decreasing density. However, the density reduction is not the only significant parameter, but also the morphology of the foams should be taken into account in order to justify the differences between tensile and flexural modulus.

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