摘要
热固性的形状记忆聚合物(SMPs)具有优异的形状记忆性能,但热固性SMPs不能直接用于3D打印,为了开发出能够应用于3D打印具有形状记忆效应的聚己内酯(PCL),采用熔融共混的方法,将含有助交联剂三羟甲基丙烷三丙烯酸酯的PCL制备成直径为1.75 mm丝材并采用熔融沉积成型方式打印制备试样,再对试样进行电子束辐照交联从而获得形状记忆效应。通过熔体流动速率、凝胶含量、力学性能和形状记忆等性能测试,研究了PCL的流动性、打印工艺参数和辐照剂量对打印试样力学性能和形状记忆性能的影响。结果表明,PCL的最佳打印温度为90~110℃,打印速度为20 mm/s;随着辐照剂量的增加,PCL打印试样的拉伸强度呈现先增大后减小的趋势,在剂量为60 kGy时具有最大拉伸强度15.77 MPa,相比于未交联试样增加了8.91%;打印试样的凝胶含量随辐照剂量的增加而上升,形状回复率也随之上升;辐照剂量为60 kGy的打印试样经过10次循环测试,形状固定率和形状回复率分别维持在99%和97%以上,表现出良好的形状记忆性能且响应迅速。
Thermosetting shape memory polymers(SMPs)have excellent shape memory properties,but thermosetting SMPs cannot be directly used in 3D printing.In order to develop polycaprolactone(PCL)with shape memory effect and apply it to 3D printing,the PCL with cross-linking agent trimethylidene propane triacrylate was prepared intoØ1.75 mm filament by melt blending method,and the samples were printed by fused deposition molding.Then the samples were cross-linked by electron beam irradiation to obtain shape memory effect.Through melt flow rate,gel content,mechanical properties and shape memory test,the effects of PCL fluidity,printing process parameters and irradiation dose on the mechanical properties and shape memory properties of printed samples were studied.The results show that the optimal printing temperature of PCL is 90-110℃and the printing speed is 20 mm/s.With the increase of irradiation dose,the tensile strength of PCL printed sample first increases and then decreases,and the maximum tensile strength of PCL printed sample is 15.77 MPa at the dose of 60 kGy,which is 8.91%higher than that of uncrosslinked sample.The gel content of the printed sample increases with the increasing of the irradiation dose,and the shape recovery rate also increases.After 10 cycles of testing,the printed samples with the irradiation dose of 60 kGy maintain the shape fixation rate and shape recovery rate above 99%and 97%,respectively,showing good shape memory performance and rapid response.
作者
张勇波
汪艳
Zhang Yongbo;Wang Yan(Material Science and Engineering School,Wuhan Institute of Technology,Wuhan 430073,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2023年第12期1-6,共6页
Engineering Plastics Application
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(2018B030323001)
武汉工程大学第十四届研究生教育创新基金项目(CX2022262)。
关键词
熔融沉积成型
聚己内酯
电子束辐照
形状记忆聚合物
fused deposition molding
polycaprolactone
electron beam irradiation
shape memory polymers
