Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, COA of Formula: C8H3FO3319-03-9, Name is 5-Fluoroisobenzofuran-1,3-dione, SMILES is O=C1OC(C2=C1C=CC(F)=C2)=O, belongs to benzoxazole compound. In a article, author is Kang, Chan Sol, introduce new discover of the category.
Effects of Drawing and Heat-Treatment Conditions on the Structure and Mechanical Properties of Polyhydroxyamide and Polybenzoxazole Fibers
We report the preparation of polybenzoxazole (PBO) fiber from polyhydroxyamide (PHA) precursor fiber which is free from strong acid such as polyphosphoric acid. We prepared the PHA fibers with different spin-draw ratios (SDRs) using a wet-spinning method and the PBO fibers with an SDR of 3.5 (SDR-3.5 PBO fibers) were prepared by various heat-treatment temperatures, and investigated their morphology, crystalline structure, and mechanical properties. The simultaneous thermogravimetric analysis-mass spectrometry (STA-MS) and field-emission scanning electron microscopy (FE-SEM) results confirmed that the diameter of the SDR-3.5 PBO fiber was much smaller than that of the SDR-3.5 PHA fiber, due to the release of water during the thermal cyclization reaction which forms the PBO structure. The wide-angle Xray diffraction (WAXD) pattern of the SDR-3.5 PBO fiber heat-treated at 350 A degrees C (SDR-3.5 PBO 350 fiber) showed two peaks, at 2 theta=14.83 A degrees and 24.38 A degrees, and the diffraction angles dropped with increasing heat-treatment temperature. In addition, the initial modulus and tensile strength of the SDR-3.5 PBO fiber heat-treated at 550 A degrees C (SDR-3.5 PBO 550 fiber) were found to be 19.1 GPa and 449.2 MPa, which were much higher than those of the SDR-3.5 PHA fiber, 9.3 GPa and 227.0 MPa, respectively.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 319-03-9. COA of Formula: C8H3FO3.
Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem