By Sarawut Rimdusit, Chanchira Jubsilp, Sunan Tiptipakorn
This publication offers an creation to the original and engaging houses of alloys and composites from novel commercialized thermosetting resins in response to polybenzoxazines. Their awesome houses resembling processability, thermal, mechanical, electric homes in addition to ballistic effect homes of polybenzoxazine alloys and composites lead them to beautiful for varied purposes in digital packaging encapsulation, mild weight ballistic armour composites and bipolar plate in gasoline cells.
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Additional info for Alloys and Composites of Polybenzoxazines: Properties and Applications (Engineering Materials)
Polymer 41:7941–7949 20. Takeichi T, Guo Y, Agag T (2000) Synthesis and characterization of poly(urethanebenzoxazine) films as novel type of polyurethane/phenolic resin composites. J Polym Sci-A 38:4165–4176 21. Rimdusit S, Pirstpindvong S, Tanthapanichakoon W, Damrongsakkul S (2005) Toughening of polybenzoxazine by alloying with urethane prepolymer and flexible epoxy: a comparative study. Polym Eng Sci 45(3):288–296 22. Takeichi T, Guo Y (2001) Preparation and properties of poly(urethane-benzoxazine)s based on monofunctional benzoxazine monomer.
It could be noticed that the copolymer at the epoxy content beyond 45 wt% presents the significant decrease of Tg with the system containing equal amount of both two components. This could be attributed to the fact that the stoichiometric ratio of components was approached; the excess small molecular weight epoxy could not be unreacted and remain in the network formed. This could hinder network formation and act as a plasticizer in the fully polymerized network as discussed by Rimdusit et al. .
The results of loss modulus (E00 ) and loss tangent (tand) exhibited only one glass-transition temperature (Tg) in both systems of poly(BA-a)/PAA and poly(BA-a)/PI. That means these blending systems were miscible. The Tgs was shifted to higher temperature when increasing the content of imide. In comparison at the same ratio, the Tgs of poly(BA-a)/PAA alloys were slightly higher than that of poly(BA-a)/PI alloys. For example, at 30 wt% of poly(BA-a), the Tg of poly(BA-a)/PI alloys is 205 °C, while that of poly(BA-a)/ PAA is higher than 215 °C.