title: Effect of hydrogen bonds on the modulus of bulk polybenzoxazines in the glassy state.
abstract: In this paper, the critical role of hydrogen bonds on the modulus of bulk polybenzoxazines in the glassy state was proved through introducing an additional hydrogen bond, C=O···HO, into the polybenzoxazine. Thorough studies were carried out to resolve the different modulus behaviors of polybenzoxazines with and without this additional hydrogen bond as the temperature increases. With the aid of dynamic mechanical analysis and in situ Fourier transform infrared spectroscopy, we found that the different performances in modulus were in accordance with the changes of C=O···HO and, therefore, revealed that the hydrogen bonds played a crucial role on the modulus of bulk polybenzoxazines in the glassy state. We believe this improved insight into the roles of hydrogen bonds is expected to help researchers explore novel polybenzoxazine resins with excellent thermal and mechanical properties.
authors.affiliation: State Key Laboratory of Polymeric Materials Engineering (Sichuan University), College of Polymer Science and Engineering, Sichuan University, Chengdu, P. R. China. guyi@scu.edu.cn.
authors.forename: Po
authors.initials: P
authors.lastname: Yang
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Wang
authors.forename: Haojun
authors.initials: H
authors.lastname: Fan
authors.forename: Yi
authors.initials: Y
authors.lastname: Gu