Synthesis and properties of polybenzoxazole-clay nanocomposites |
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Authors: | Steve Lien-Chung Hsu Keng-Chuan Chang |
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Affiliation: | Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, ROC |
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Abstract: | A novel polybenzoxazole (PBO)/clay nanocomposite has been prepared from a PBO precursor, polyhydroxyamide (PHA) and an organoclay. The PBO precursor was made by the low temperature polycondensation reaction between isophthaloyl chloride (IC) and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane with an inherent viscosity of 0.5 dl/g. The organoclay was formed by a cation exchange reaction between a Na+-montorillonite (Na+-Mont) clay and an ammonium salt of dodecylamine. The PHA/clay was subsequently thermal cured to PBO/clay. Both X-ray diffraction and transmission electron microscope analyzes showed that the organoclay was dispersed in the PBO matrix in a nanometer scale. The in-plane coefficient of thermal expansion (CTE) of PBO/clay film decreased with increasing amounts of organoclay. The CTE of PBO/clay film containing 7 wt% clay was decreased by 21% compared to the pure PBO film. Both of the glass transition temperature (Tg) and the thermal decomposition temperature of PBO/clay increased with increasing amounts of organoclay. The thermal decomposition temperature and the Tg of PBO/clay containing 7 wt% clay increased to 12 and 16 °C, respectively. |
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Keywords: | Nanocomposite Polybenzoxazole Organoclay |
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