摘要
低密度聚乙烯(LDPE)经过过氧化物交联改性后可形成三维网状结构,并表现出形状记忆性能。所得的热固性形状记忆聚合物(SMP)结构稳定,形状回复能力强,多次循环仍可保持较高的形状回复率(Rr)和固定率(Rf)。然而热响应SMP的应用环境单一,需要直接接触加热才能触发形状记忆效应。因此,通过加入功能性的填料赋予其多种响应方式,从而应用于可远程控制的医疗器械、软机器人以及航空航天等领域。本工作以LDPE为基材,以Fe3O4为填料,选用2,5-二(叔丁基过氧)-2,5-二甲基-3-己炔(DTBP)为交联剂,三烯丙基异氰脲酸酯(TAIC)为助交联剂,制备了具有光热、磁响应的形状记忆LDPE/Fe3O4复合材料。通过探究DTBP含量对性能的影响,发现随着DTBP的增加,试样的凝胶含量、力学性能以及形状记忆性能都呈现上升趋势。当DTBP含量为2 wt%时,LDPE/Fe3O4的凝胶含量达到最大值83.09%,力学性能综合表现最优,拉伸强度达10.03MPa较未交联的试样提高了28%;且形状记忆性能优异,Rr接近100%,Rf达96.52%。同时,复合材料的光热转化能力较强,7 s内可升温至105.6℃,制成的花朵试样在18 s内回复到原始形状。
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.
作者
黄芸珂
汪艳
HUANG Yun-ke;WANG Yan(School of Material Science and Engineering,Wuhan Institute of Technology,Wuhan 430037,China)
出处
《高分子通报》
CAS
CSCD
北大核心
2024年第12期1814-1820,共7页
Polymer Bulletin
基金
3D打印聚合物及复合材料广东省企业重点实验室项目(项目号2018B030323001)
武汉工程大学第十五届研究生教育创新基金项目(基金号CX2023089)。
关键词
交联聚乙烯
形状记忆聚合物
光热响应
磁响应
FE3O4纳米粒子
Crosslinked polyethylene
Shape memory polymer
Photothermal responsive
Magnetic responsive
Fe3O4 nanoparticle
