Download Alloys and Composites of Polybenzoxazines: Properties and by Sarawut Rimdusit, Chanchira Jubsilp, Sunan Tiptipakorn PDF

By Sarawut Rimdusit, Chanchira Jubsilp, Sunan Tiptipakorn

This publication offers an advent to the original and engaging homes of alloys and composites from novel commercialized thermosetting resins according to polybenzoxazines. Their extraordinary houses comparable to processability, thermal, mechanical, electric homes in addition to ballistic influence houses of polybenzoxazine alloys and composites cause them to beautiful for numerous functions in digital packaging encapsulation, mild weight ballistic armour composites and bipolar plate in gas cells.

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Extra info for Alloys and Composites of Polybenzoxazines: Properties and Applications

Sample text

Therefore, the lignin polymer could make network structure denser and the mobility of the backbone lower than the neat polybenzoxazine. Recently, Emranul Haque et al. [40] prepared and studied the polymer alloys of bisphenol-A-based polybenzoxazine and lignin by mixing two components and following with thermal curing. It was revealed that lignin accelerates the polymerization of benzoxazine. At the lignin content up to 2 wt%, the alloy is transparent. In case of higher content, the phase separation was observed.

Some previous studies have been done to utilize reactive diluents to lower liquefying temperature as well as to further reduce melt viscosity of the benzoxazine resins such as by adding a liquid epoxy [19] as well as a liquid monofunctional benzoxazine resins [20–22]. Although a significant reduction in viscosity and liquefying point was obtained using the liquid epoxy, the resulting alloy mixtures were reported to render higher curing temperature than that of the neat benzoxazine resin. Recently, Jubsilp et al.

For example, the synthesis of the alloy using 3-phenyl-3,4-dihydro-2H-1,3-benzoxazine (Cm-type monofunctional benzoxazine resin) and urethane prepolymer (derived from polyethylene adipate polyol with molecular weight of 1000 Da and 2,4-tolylene diisocyanate at molar ratio of 1:2) are shown in Fig. 4 [20]. It was reported that during polymerization, there could be intermolecular reaction between hydroxyl groups (OH-) of benzoxazine monomer and isocyanate groups (NCO-) of urethane prepolymer. The cured poly(benzoxazine-urethane) alloys films were transparent, indicating good compatibility between two components.

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