4D打印热响应丙烯酸酯基形状记忆聚合物及其性能研究

Study on 4D Printed Shape Memory Polymer Based on Heat-responsive Acrylate and Its Properties

利用选择性区域光固化技术(LCD)进行4D打印,将脂肪族聚氨酯丙烯酸酯(JZ302)与双酚A型环氧丙烯酸酯树脂(RJ313)进行共混,制备了温度响应丙烯酸酯基形状记忆聚合物。研究了脂肪族聚氨酯丙烯酸酯(JZ302)的加入比例对形状记忆性能和力学性能的影响。结果表明,在可打印范围内,随着JZ302比例的增加,丙烯酸基形状记忆聚合物形状恢复时间逐渐缩短,均表现出较高的形状固定率、形状恢复率;在80℃水浴条件下,JZ302/RJ313-30打印样品,10个周期的形状固定率(R_(f))和形状恢复率(R_(r))分别保持在99.2%和98.8%左右;不同比例预聚物(JZ302/RJ313-X)的打印样品完成180°的形状恢复仅花费5~40 s,显示出良好的形状记忆效应;JZ302的加入提高了打印样品的热稳定性,逐渐增大了形状记忆聚合物的断裂伸长率。同时,利用4D打印形状记忆聚合物实现了智能开关的制作。

Shape memory polymer based on heat-responsive acrylate was prepared by blending aliphatic polyurethane acrylate(JZ302)with bisphenol A epoxy acrylate resin(RJ313)to utilize selective area photo curing technology(LCD)for four dimensional(4D)printing.The effects of the addition proportion of aliphatic polyurethane acrylate(JZ302)on shape memory and mechanical properties were investigated.The results demonstrate that the shape recovery time of acrylic shape memory polymer is gradually shortened with the increase of JZ302 ratio in the printable range,and both of them exhibit high shape retention and shape recovery rates.Under condition of 80℃water bath,the shape fixation rate(R_(f))and shape recovery rate(R_(r))of JZ302/RJ313-30 keep 99.2%and 98.8%after 10 cycles,respectively.The printed samples with different proportions of polymers(JZ302/RJ313-X)spend only 5~40 s to complete the shape recovery at 180°,showing good effect on shape memory.The addition of JZ302 improves the thermal stability of the printed sample and gradually increases the elongation at break of the shape memory polymer.At the same time,the intelligent switch is fabricated with 4D printed shape memory polymer.