J-GLOBAL ID:200904077562830920  Research Project code:9910001190 Update date:Nov. 13, 2003

Study on Environmental degradation and morphology of polyolefin materials.

Study period:1998 - 2000
Organization (1):
Investigating Researcher (1):
Research overview:
We prepared films with different degrees of crystallinity and orientation by changing the preparation condition such as heat-treatment times and draw ratio. All the sample films were exposed to UV-rays in air at 63°C for different periods between 1 and 12 days using a weather meter. We measured IR, DSC, density, dynamic viscoelastic property for both the films before and after exposing of UV-rays. For all films, the absorbance increased after the exposure time passed approximately from 2 to 4 days. This suggests that there exists an induction period for oxidation. For drawn films the induction period was longer and also the rate of increase in the absorbance was lower. The heat of fusion increased stepwisely with increasing exposure time. Density, however varied very complicatedly. It is suggested that the molecular aggregation state in amorphous region significantly changes in the induction period of degradation.
Keywords (10):
polyolefin ,  degradation ,  morphology ,  molecular aggregation ,  molecular mobility ,  induction period ,  degree of crystallinity ,  非晶領域 ,  密度 ,  融解熱 dynamic viscoelastic property, weather meter, estimation
Research program: Ordinary Research

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