Supporting Information
A High Ductility RTM Epoxy Resin with Relatively High Modulus and Tg
Han-qiao Shia, Bao-gang Suna*, Qian Liua, Zhi-yong Yanga, Kai Yia, Yi Zhanga, and Shao-yun Fub
a Aerospace Research Institute of Materials & Processing Technology, Beijing, 10076, China
b Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
Fig. S1. IR spectra for the uncured pure epoxy and cured epoxy resins with various mass fractions of D-230.
Fig. S2. Effect of the D-230 content on the IR area ratio of A(912) / A(1606). A(912) is the area of the epoxide peak at 912 cm-1 in cured resin samples, A(1606) is the area of the phenyl ring peak at 1606 cm-1.
As shown in Fig. S1, for the uncured epoxy resin, the epoxide band at 912 cm-1 was prominent. For cured epoxy resins, when the mass fraction of D-230 in the mixed hardener was 0 wt%～80 wt%, the epoxide band at 912 cm-1 was still exist, indicating that the conversion of epoxide groups was incomplete in these cured resins; while when the mass fraction of D-230 in the hardener was 100%, the epoxy group peak at 912 cm-1 almost disappeared, showing that the conversion of epoxide groups was more complete.
Fig. S2 shows the relationship between the mass fraction of D-230 and the peak area of epoxide band at 912 cm-1. The data were normalized with respect to the phenyl ring stretching absorption at 1606 cm-1. As the D-230 content increased, the IR area ratio of A(912) / A(1606) gradually decreased, indicating a increasing conversion of the epoxide groups. Because DETDA also has phenyl ring, the actually increased extent of epoxide conversion was larger. The similar result has been reported previously[1].
References
1. Mondragon I, Bucknall CB (1994) Plast Rubb Compos Proc Appl 21: 275-281.