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Trends in Chemical Engineering   Volumes    Volume 17 
Crystallinity and chain orientation of injection-molded poly(butylene terephthalate) depending on the depth profile at the surface
Masanori Haga, Takahiko Nakaoki, Hideaki Ishihara, Katsuhisa Yamashita, Kenichi Funaki
Pages: 1 - 9
Number of pages: 9
Trends in Chemical Engineering
Volume 17 

Copyright © 2019 Research Trends. All rights reserved

The proposed study aims to investigate the relationship between the crystallinity and chain orientation of injection-molded poly(butylene terephthalate) (PBT) as a function of depth profile using thermal analysis, X-ray diffraction, and polarized infrared (IR) spectroscopy. The crystallinity determined by differential scanning calorimetry (DSC) decreased from the skin to core layers, whereas that determined by X-ray diffraction increased from the skin to core layers. The difference in crystallinity determined by DSC and X-ray diffraction is due to the formation of a mesophase, which is formed in the skin layer due to the presence of the shear stress. The chain orientation was observed by polarized attenuated total reflection (ATR)-IR spectroscopy. At the gate of PBT plate, the dichroic ratio at 874 cm-1 was about 0.8 and 0.5 near the skin layer, whereas it reached around 1.0 and 0.75 at the core layer for PBT formed at injection molding rates of 40 and 80 mm/s, respectively, corresponding to the increased chain orientation in the skin layer. This indicated that more mesophase was formed due to the shear stress at the skin layer.
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