Anomalous Isomeric Effect on the Properties of Bisphenol F-based Benzoxazines: Toward the Molecular Design for Higher Performance

作者：Liu Jia; Ishida Hatsuo^*

来源：Macromolecules, 2014, 47(16): 5682-5690.

DOI：10.1021/ma501294y

A series of 2,2%26apos;-, 2,4%26apos;-, and 4,4%26apos;-substituted benzoxazine monomers based on isomeric bisphenol F and aniline has been synthesized in order to obtain a basic set of design rules toward making higher performance polybenzoxazines. All the monomer structures are confirmed by H-1 and C-13 NMR, and the purity is calculated by H-1 NMR. The polymerization behavior is studied by differential scanning calorimetry (DSC) and in situ Fourier transform infrared spectroscopy (FT-IR), The rate of polymerization increases in the order 4,4%26apos;-, 2,4%26apos;-, and 2,2%26apos;-substituted monomer. After polymerization, the thermal stability and glass transition temperature (T-g) of each polymer are studied by thermogravimetric analysis (TGA) and temperature-modulated DSC. The polymer obtained from 2,2%26apos;-substituted monomer gives highest thermal stability as well as T-g, which is against many of such examples available in the literature. Discussions on understanding benzoxazine structure property relationships have been provided.

• 出版日期2014-8-26