چكيده لاتين :
EPoxy resins (ER) are considered as one of the most important classes of thermosetting
polymers and are extensively used in various applications. But they are very brittle, with poor resistance to crack propagation and have low impact strength. In the present work, a series of hydroxyl terminated polybutadiene (HTPB) was directly dispersed in the epoxy resin. Then, the dispersed phase was cross-linked by divinylbenzene (DVB) that was previously added to HTPB. Different content of DVB and HTPB are evaluated for effecting on the most of physico-chemical properties of the epoxy resin. The FTIR analysis evidenced the occurrence of a chemical reaction between HTPB and DVB and also ER which was led to improved compatibility. The DMTA analysis of samples indicated different Tg for HTPB/DVB and ER in the mixture and explaining the phase separation between rubber and matrix phases. On adding DVB the stress-at-break increased accompanied by an increase in the elongation-at-break value. Maximum impact strength is obtained by adding 20 phr of DVB and 5 phr HTPB. Finally, SEM analysis
showed that modified rubber particlesי diameter is about 5 urn (corresponding to maximum of toughness)
