辐照交联SBS/LDPE共混物的形状记忆效应研究  

Shape memory effect of radiation cross-linked SBS/LDPE blends

作　　者：王永坤[1] 朱光明[1] 张磊[2] 刘婷婷[1] 谢建强[1] 

机构地区：[1]西北工业大学应用化学系,西安710129 [2]西北核技术研究所,西安710024

出　　处：《辐射研究与辐射工艺学报》2013年第6期36-39,共4页Journal of Radiation Research and Radiation Processing

摘　　要：以苯乙烯-丁二烯嵌段共聚物(SBS)热塑性弹性体和低密度聚乙烯(LDPE)为主要原料,使用混炼机将SBS与LDPE按80:20的比例共混并在硫化机上模压制成SBS/LDPE共混物,利用γ射线辐照上述共混物使之交联。通过DSC分析、力学性能和形状记忆性能测试,研究了辐照交联SBS/LDPE共混物材料的结构对形状记忆性能的影响。结果表明,SBS/LDPE共混物随吸收剂量的增加,交联度增大,拉伸强度与断裂伸长率均逐渐降低;此外,适度交联的SBS/LDPE共混物呈现良好的形状记忆效应,形变回复率高于95%。A novel shape memory polymer material was fabricated by ）,-ray irradiating the blending thermo- plastic styrene-butadiene-styrene block copolymer （SBS） with low density polyethylene （LDPE）, and SBS/LDPE=80/20. The relationship between the structure and shape memory properties of SBS/LDPE blends was investigated by the analysis of gelation level, DSC, mechanical properties and shape memory performances. The re- suits show that with increasing absorbed dose, the gelation level of SBS/LDPE blends increases, meaning that the de- gree of cross-linking of SBS/LDPE blends increases; while the tensile strength of blends and the elongation at break decrease gradually. In addition, the radiation cross-linked SBS/LDPE blends exhibited good shape memory effect, and the shape recovery ratio is more than 95%.

关 键 词：SBS LDPE共混物 辐照交联 力学性能 形状记忆行为 

分 类 号：TL13[核科学技术—核能科学] TB381[一般工业技术—材料科学与工程]