One important characteristic of benzoxazine resin (BA-a) is its ability to alloy with various species of resins or polymers. In this research, we have demonstrated an ability of benzoxazine resin to alloy with epoxy and urethane resins to form polymers with shape memory properties. The dual function of benzoxazine resin to act as curing agent of epoxy resin and as a stable or rigid network segment for shape memory epoxy (SMEs) significantly simplifies a formulation of shape memory epoxy systems. The presence of the polybenzoxazine in SMEs was found to significantly enhance their recovery stress values. Moreover, with an addition of suitable amount of reinforcement e.g. silicon carbide whisker (SiCw), recovery stress of the resulting shape memory composites in flexural mode as high as 11.2 MPa can be achieved compared to the value of 3.4 MPa of the neat SMEs. Furthermore, the alloys of benzoxazine resin with urethane elastomers were found to provide relatively broad glass transition temperature with multiple-shape memory effects. High values of shape fixity i.e. 70%-96% for the first temporary shape and 83%-99% for the second temporary shape and high shape recovery of 88%-96% for the first temporary shape and 97%-99% for the original shape were also achieved.<br/>

Shape memory polymers based on polybenzoxazine alloys and composites enhancement of recovery stress and thermal properties

255th National Meeting (2018)

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