1. Surface roughness and foam morphology of cellulose acetate sheets foamed with 1,3,3,3-tetrafluoropropene
- Author
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Stefan Zepnik, Frank van Lück, Sven Hendriks, Christian Hopmann, Claudia Spicker, and Publica
- Subjects
bio-based polymers ,Materials science ,Morphology (linguistics) ,Polymers and Plastics ,foams ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,thermoforming ,blowing agent ,chemistry.chemical_compound ,morphology ,Materials Chemistry ,Surface roughness ,1,3,3,3-Tetrafluoropropene ,Composite material ,Cellulose ,cellulose acetate ,extruded sheets ,General Chemistry ,021001 nanoscience & nanotechnology ,Cellulose acetate ,0104 chemical sciences ,chemistry ,surface roughness ,0210 nano-technology - Abstract
Cellulose acetate (CA) is a bio-based polymer suitable to replace foamed polystyrene (PS) in packaging applications. Foam trays can be produced by thermoforming of extruded sheets foamed with physical blowing agents. In this paper, the effects of various process settings and the calibration of the sheet on foam morphology and surface quality of extruded CA sheets are presented. Different contact cooling options were applied in order to investigate their influence on surface roughness, density, and morphology of the sheets. By adjusting cooling parameters, blowing agent formulation, and process settings, smooth foam sheets with a surface roughness below 10 µm and a density in the range of 150 kg m−3 were produced.
- Published
- 2016
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