TY - JOUR
T1 - Synthesis and properties of polybenzoxazole-clay nanocomposites
AU - Hsu, Steve Lien Chung
AU - Chang, Keng Chuan
N1 - Funding Information:
The authors are indebted to Prof. Chi Wang (National Cheng-Kung University) for his help in obtaining transmission electron micrography. The financial support provided by the National Science Council through project NSC 89-2216-E006-095 is also greatly appreciated.
PY - 2002/5/23
Y1 - 2002/5/23
N2 - 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.
AB - 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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U2 - 10.1016/S0032-3861(02)00249-5
DO - 10.1016/S0032-3861(02)00249-5
M3 - Article
AN - SCOPUS:0037161896
VL - 43
SP - 4097
EP - 4101
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 15
ER -