Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics, 540-36-3, Name is 1,4-Difluorobenzene, SMILES is FC1=CC=C(F)C=C1, belongs to benzoxazole compound. In a document, author is Sidra, Lala Rukh, introduce the new discover, Safety of 1,4-Difluorobenzene.
Processable poly(benzoxazole imide)s derived from asymmetric benzoxazole diamines containing 4-phenoxy aniline: synthesis, properties and the isomeric effect
Two asymmetric diamine monomers, incorporating both aryl ether and non-linear benzoxazole groups, namely 5-amino-2-(4-(4-aminophenoxy)phenyl)benzoxazole (p-BOODA) and 5-amino-2-(3-(4-aminophenoxy)phenyl)benzoxazole (m-BOODA), were designed and synthesized. Two novel series of poly(benzoxazole imide)s (PBOIs), PI-3(a-e) and PI-4(a-e), were prepared via thermal imidization of commercial tetracarboxylic dianhydrides with diamines p-BOODA and m-BOODA, respectively. The effects of chain isomerism on molecular packing and the physical properties of PBOIs are investigated. These PBOIs showed excellent mechanical properties with tensile strengths of 106-168 MPa, tensile moduli of 2.7-5.5 GPa and elongations at break of 4.4-9.3%; in addition, they exhibited good thermal stability (T-5% = 488-570 degrees C) and high glass transition temperatures (T(g)s) up to 333 degrees C. Moreover, BTDA (3,3,4,4-benzophenone tetracarboxylic dianhydride) derived PBOIs, PI-3b and PI-4b, showed crystalline transition in spite of bent groups and the asymmetric chain structure. The incorporation of the asymmetric benzoxazole structure with flexible ether connecting groups improved the solubility of the PBOI system. Furthermore, the controlled molecular weight (M-w) polymer PI-4e-PA derived from m-BOODA demonstrated excellent solution and melt processability with the lowest complex viscosity of 44 Pa s at 380 degrees C.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 540-36-3 is helpful to your research. Safety of 1,4-Difluorobenzene.
Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem