Preparation and Characterization of Thermally Stable Polybenzoxazole Copolymer Films Fabricated from Their Precursors 


Vol. 20,  No. 12, pp. 2443-2452, Dec.  2019
10.1007/s12221-019-1110-3


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  Abstract

The polyhydroxyamide copolymers (F-PHAs) were synthesized by low-temperature solution polycondensation of 2,2-bis(3-amino-4-hydroxyphenyl) hexafluoropropane (BAHHFP) and/or 3,3'-dihydroxybenzidine (DHB) with terephthaloyl chloride (TPC) in N,N-dimethylacetamide (DMAc) with the aid of lithium chloride (LiCl). A series of polybenzoxazole copolymer (F-PBO) films were fabricated via an efficient solution-casting and thermal-treatment technique, using their precursors (F-PHA films) with different BAHHFP fractions (25-100 mol%). The solubility results show that F-PHAs with higher BAHHFP content (75 mol%) are readily soluble in anhydrous DMAc and N-methyl-2-pyrrolidinone (NMP) without LiCl at room temperature. Differential scanning calorimetry (DSC) indicates that the thermal cyclization temperature of the F-PHA films decreases with increasing BAHHFP content. Thermogravimetric analysis (TGA) reveals that the F-PHA and FPBO films are well prepared and completely converted. The UV-visible spectra indicate that the F-75-PBO film (BAHHFP content: 75 mol%) has reasonable transparency, with 84.9 % transmittance at 600 nm and 397-nm UV cut-off wavelength. It also has lower coefficient of thermal expansion (CTE) (48 ppm/oC) and water absorption (WA) values (0.14 %). The BAHHFP as diamine component provides the final F-PBO film with desirable properties, e.g., flexibility, thermal stability, transparency, and WA values.

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  Cite this article

[IEEE Style]

C. S. K. a. D. H. Baik, "Preparation and Characterization of Thermally Stable Polybenzoxazole Copolymer Films Fabricated from Their Precursors," Fibers and Polymers, vol. 20, no. 12, pp. 2443-2452, 2019. DOI: 10.1007/s12221-019-1110-3.

[ACM Style]

Chan Sol Kang and Doo Hyun Baik. 2019. Preparation and Characterization of Thermally Stable Polybenzoxazole Copolymer Films Fabricated from Their Precursors. Fibers and Polymers, 20, 12, (2019), 2443-2452. DOI: 10.1007/s12221-019-1110-3.

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pISSN : 1229 - 9197
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