Fine structure and physical properties of poly(buthylene terephthalate) sheets prepared by roller drawing method |
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Authors: | Sun Hee Lee Kazuo Nakayama Hyun Hok Cho |
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Institution: | (1) Macromolecular Technology Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan;(2) Deparment of Organic Material Science and Engineering, Pusan National University, Busan, 609-735, Korea |
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Abstract: | Poly(butylene terephthalate) sheets were prepared by roller-drawing method with various draw ratio. The drawing temperature
is 100 °C and draw ratios were varied 2, 2.5, 3, 3.5 and 4. The effect of draw ratio on the crystal structure, the molecular
orientation, dynamic viscoelastic properties, sonic modulus and tensile properties of the roller-drawn PBT sheets were investigated.
In WAXD results, with increasing of the draw ratio, (010) and (100) planes of preferred orientation have the strongest intensity
on the equator. In the meridional scans, it was confirmed that α and β crystal co-existed in the roller drawn PBT sheets with
various draw ratio. Uniaxially roller-drawn PBT sheets clearly increased orientation along the stretched direction at high
draw ratio. And the four-methylene groups of PBT orient along the surface of the sheet. The mechanical properties of PBT sheets
were improved by orientation-induced crystallization during roller drawing process at 100 °C. |
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Keywords: | Polybutylene terephthalate(PBT) Sheet Roller drawing α crystal β crystal |
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