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Analysis of contributing factors to production of highly transparent isotactic polypropylene extrusion sheets. Part I by Akira Funaki; Toshitaka Kanai; Yuta Saito; Toshiro Yamada is a Materials Science article available to read on EtoBox.

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## Abstract To obtain highly transparent isotactic polypropylene sheet by an industrial process, various factors contributing to transparency were analyzed. Two kinds of sheets were prepared for analysis. The one was extruded by a direct single belt process as the quick quenching system. And the other was extruded by a conventional air knife process as the slow cooling system. The higher order structure of each sample sheet was investigated by phase‐contrast microscopy, polarizing microscopy, light scattering, wide‐angle X‐ray diffraction (WAXD), small angle X‐ray scattering (SAXS), and transmission electron microscope (TEM). In the case of the quick quenching sheet, many spherical substances were generated near sheet surfaces. Comparing with static cooling experiments, it was thought that the main cause was the orientation crystallization by the residual stress. The spherical substances in a phase‐contrast micrograph were extremely coincident with the maltese cross pattern in a polarizing micrograph. Other analysis results also showed that these spherical substances were spherulites. And after the heat treatment, the matrix was transformed from smectic structure to α‐monoclinic cr

Who reads Analysis of contributing factors to production of highly transparent isotactic polypropylene extrusion sheets. Part I?

Author

Akira Funaki; Toshitaka Kanai; Yuta Saito; Toshiro Yamada

Publisher

Society for Plastic Engineers; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0032-3888)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)