Publication: Isothermal decomposition behavior and dynamic mechanical properties of in situ-reinforcing elastomer composites based on thermoplastic elastomers and thermotropic liquid crystalline polymer
Issued Date
2007-01-15
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ISSN
10974628
00218995
00218995
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2-s2.0-33845998876
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Applied Polymer Science. Vol.103, No.2 (2007), 917-927
Suggested Citation
Sunan Saikrasun, Taweechai Amornsakchai Isothermal decomposition behavior and dynamic mechanical properties of in situ-reinforcing elastomer composites based on thermoplastic elastomers and thermotropic liquid crystalline polymer. Journal of Applied Polymer Science. Vol.103, No.2 (2007), 917-927. doi:10.1002/app.25238 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/24376
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Title
Isothermal decomposition behavior and dynamic mechanical properties of in situ-reinforcing elastomer composites based on thermoplastic elastomers and thermotropic liquid crystalline polymer
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Abstract
In situ-reinforcing composites based on two elastomer matrices very different in melt viscosity, styrene-(ethylene butylene)-styrene triblock copolymer (Kraton G1650), and styrene-(ethylene propylene) diblock copolymer (Kraton G1701), and a thermotropic liquid crystalline polymer (TLCP), Rodrun LC3000, were prepared using a twin-screw extruder. The isothermal decomposition behavior and dynamic mechanical properties of the extruded strands were investigated by means of thermogravimetry (TG) and dynamic mechanical analysis (DMA), respectively. No significant change in the shape of TG curves for the neat matrices and their LC3000-containing blends was observed under isothermal heating in nitrogen. In air, G1650 and G1701 showed a single weight-loss stage and rapid decomposition whereas their blends with 30 wt % LC3000 showed different profiles of weight loss depending on isothermal temperatures. The calculated kinetic parameters indicated mat the thermal stability of the polymers is much higher in nitrogen than in air and suggested an enhancement of thermal resistance of the elastomer matrices by addition of TLCP. DMA results showed a great enhancement in dynamic moduli for the blend with 10 wt % LC3000 when compared with the neat matrix. The tan 5 peaks corresponding to the elastic and hard phases in both matrices mostly shifted to the lower temperature with LC3000 loading. © 2006 Wiley Periodicals, Inc.