Preparation of Shape Memory Cross-linked Polyethylene and Its Photothermal and Magnetic Response Properties
Low-density polyethylene(LDPE)forms a three-dimensional mesh structure after peroxide cross-linking modification and exhibits shape memory properties.The obtained thermoset shape memory polymer(SMP)shows good structural stability and excellent shape recovery,which can maintain high shape recovery(Rr)and fixation rates(Rf)even after multiple cycles.However,thermos-responsive SMP have limited application environments that require direct contact heating to trigger the shape memory effect.By adding functional fillers,it can be endowed with a variety of response modes for applications such as remotely controllable medical devices,soft robotics,and aerospace.In this work,LDPE as a substrate and Fe3O4 as a filler,2,5-bis(tert-butylperoxy)-2,5-dimethyl-3-hexynyl(DTBP)was selected as a cross-linking agent,and triallyl isocyanurate(TAIC)as a co-cross-linking agent,to prepare shape-memory LDPE/Fe3O4 composites with photo-thermal and magnetic responses.By exploring the effect of DTBP content on the properties,it was found that the gel content,mechanical properties,and shape memory properties of the sample showed an increasing trend with the increase of DTBP.It was found that when DTBP content was 2 wt％,the gel content of LDPE/Fe3O4 reached a maximum value of 83.09％.And the mechanical properties had the optimal overall performance,with a tensile strength of 10.03 MPa,28％higher than that of the uncrosslinked sample;the shape memory performance was also excellent,with a Rr of close to 100％,and Rf reaches 96.52％.At the same time,the LDPE/Fe3O4 has a strong photothermal conversion ability,and can be heated up to 105.6 ℃ within 7 s,and the flower sample returns to the original shape within 18 s.
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