Cure behavior and compatibilization of epoxide hyperbranched polyurethane on silica/benzoxazine blend

Abstract

The compatibility of polymer blends is pivotal for their performance enhancement due to the large surface tension and weak interaction among individual components. In this work, epoxide hyperbranched polyurethanes (EHPU) was used to realize the compatibility between silica (SiO2), generated in situ from tetraethoxysilane, and benzoxazine (BZ). The compatibilization effect and mechanism of EHPU on SiO2/BZ were investigated via the differences of cure characteristics and kinetics between BZ, SiO2/BZ, and EHPU‐SiO2/BZ blend. EHPU‐SiO2/BZ blend exhibited lower initial curing temperature and wider curing window than those of SiO2/BZ and neat BZ. In addition, the co‐curing reaction was existed between EHPU and BZ, which contributed to the reactive compatibilization. More importantly, the growth of SiO2 particles was hindered by the nonreactive compatibilization due to the hydrogen interaction between EHPU and the silanols. Thus, the compatibilization of EHPU on SiO2/BZ blend is a result of the synergetic effect of the hydrogen interaction and the co‐curing. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46879.

Bio‐based benzoxazines based on sesamol: Synthesis and properties

“…Although benzoxazine resin has various advantages as described above, it needs to be modified to broaden its range of applications. There are two main strategies for modification of benzoxazines: (1) selection of different phenolics and amines to alter the performance of benzoxazine resin and (2) preparation of composite materials by blending or copolymerizing with other materials …”

“…There are two main strategies for modification of benzoxazines: (1) selection of different phenolics and amines to alter the performance of benzoxazine resin and (2) preparation of composite materials by blending or copolymerizing with other materials. [19][20][21][22][23][24][25][26] However, most of the raw materials used for the synthesis of benzoxazine are derived from petroleum resources. To protect the environment and mitigate the depletion of petroleum resources, the use of renewable resources has become an important topic in various fields.…”