聚多巴胺改性纳米二氧化硅增强反式-1,4-聚异戊二烯形状记忆聚合物的制备与性能  

Preparation and properties of polydopamine modified nano-silica reinforced trans-1,4-polyisoprene shape memory polymers

作　　者：张闯 张静[1] 王娜[1,2] 李龙 ZHANG Chuang;ZHANG Jing;WANG Na;LI Long(Liaoning Provincial Key Laboratory for Preparation and Application of Special Functional Materials,Shenyang University of Chemical Technology,Shenyang 110142,China;Shenyang Research Institute of Industrial Technology for Advanced Coating Materials,Shenyang 110142,China)

机构地区：[1]沈阳化工大学辽宁省特种功能材料合成与制备重点实验室,沈阳110142 [2]沈阳先进涂层材料产业技术研究院有限公司,沈阳110142

出　　处：《复合材料学报》2023年第5期2772-2782,共11页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划“科技冬奥”(2019YFF0302004);辽宁省“兴辽英才计划”项目(XLYC2005002);2021年辽宁省“揭榜挂帅”科技攻关项目(2021JH1/10400091);沈阳市科学技术计划-重大关键核心技术攻关专项(20-202-1-15);辽宁省教育厅科学研究经费项目(LJKZ0436)。

摘　　要：由于形状记忆聚合物(SMP)较低的力学强度,不足以满足现今大多数商用复合材料的使用标准,严重限制了其在许多高级应用中的使用。因此,为制备高性能SMP复合材料,利用聚多巴胺(PDA)对纳米SiO_(2)进行表面改性,制备了一种新型纳米填料SiO_(2)@PDA,并通过SEM、XPS和FTIR对其结构和性能进行了表征。将SiO_(2)和SiO_(2)@PDA作为纳米填料填充到反式-1,4-聚异戊二烯(TPI)中,制备了TPI形状记忆复合材料,系统的研究了TPI/SiO_(2)和TPI/SiO_(2)@PDA复合材料的热稳定性、力学性能和形状记忆性能。结果表明:PDA修饰增强了SiO_(2)在TPI基体中的分散性和界面相互作用,从而使TPI/SiO_(2)@PDA复合材料的热稳定性、力学性能得到提升的同时仍能够保持良好的形状记忆性能。当SiO_(2)@PDA含量为1.5%(以TPI的质量为基准,下同)时,TPI复合材料的冲击强度和拉伸强度达到最大值,分别比纯TPI提高了43.5%和25%。此外,复合材料固定率(R_(f))和回复率(R_(r))均超过97%。The low mechanical strength of shape memory polymers(SMP)are insufficient to meet the standards of most commercial composites today,severely limiting their use in many advanced applications.Therefore,in order to prepare high-performance SMP composite materials,a novel nano-filler SiO_(2)@PDA was prepared by surface modification of nano-silica(SiO_(2))with polydopamine(PDA),its structure and properties were characterized by SEM,XPS and FTIR,respectively.Shape memory composites based on trans-1,4-polyisoprene(TPI)were prepared by filling SiO_(2)and SiO_(2)@PDA into TPI as nano-fillers.The thermal stability,comprehensive mechanical properties and shape memory properties of TPI/SiO_(2)and TPI/SiO_(2)@PDA composites were systematically studied.The results show that PDA modification enhances the dispersion and interfacial interaction of SiO_(2)in the TPI matrix,so that the thermal stability and mechanical properties of the TPI/SiO_(2)@PDA composites can be improved,while maintaining good shape memory performance.The impact strength and tensile strength of the composite reach the maximum values when the SiO_(2)@PDA content is 1.5%(based on the mass of TPI,the same below),which are 43.5%and 25%higher than that of the neat TPI,respectively.Moreover,shape fixation rate(R_(f))and shape recovery rate(R_(r))of the composites are over 97%.

关 键 词：反式-1 4-聚异戊二烯 聚多巴胺 纳米二氧化硅 力学性能 形状记忆 

分 类 号：TB332[一般工业技术—材料科学与工程]