Orientational measurements on a crosslinkable thermotropic main-chain copolyester using FTIR spectrometry
✍ Scribed by K. Sahre; K.-J. Eichhorn; N. Reichelt; D. O. Hummel
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 407 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0323-7648
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✦ Synopsis
The orientation capability of thin solution-cast films of a new synthesized crosslinkable thermotropic main chain copolyesterwith itaconoyl units was demonstrated by means ofpolarized FTIR spectrometry.The isotropic films with a thickness of about 10 p m were drawn uniaxially and annealed to get a preferential alignment of the polymer backbone in the drawing direction and an increase of the state of order.The resulted state should be fixed by a following crosslinking reaction of the itaconoyl unit to obatin a thermostable polymeric material with reduced anisotropy of mechanical properties.The orientation effects of mesogenic units dominate in the drawn films of the ternary copolyester. WAXS and DSC results show that annealing of the films produce an increase in crystallinity. More ordered regions in the solid polymer are formed which cause typical changes in the IR spectra.