摘要
合成兼具高机械力学性能和多重循环利用性能的弹性体材料是一个极具挑战性的工作.诸多研究中提到的可行方法均存在操作繁琐、难以控制的特点,因而难以实现高强度和工业化生产.本研究报道了一种经由官能化聚硅氧烷和稀土盐之间的配位交联反应制备高强度含硅弹性体的方法.其中的配位交联反应是在模压成型阶段发生;制备过程简便,易于实现工业化.这些弹性体具有高拉伸强度(2.58 MPa)和高断裂伸长率(500%).弹性体在被粉碎后,其粉末可以被重新加工成新的弹性体材料.经过3次重复循环利用后,弹性体仍能达到1.48 MPa的拉伸强度.经测试分析发现,在弹性体结构中同时存在有大量未参与配位的腈基和稀土离子.在弹性体被粉碎和循环利用时,这些未参与配位的腈基和稀土离子能够重新参与配位过程,从而实现新的交联,进而实现了高机械力学性能和多重循环利用性能.
It is a critical challenge to prepare elastomers with both high mechanical properties and multiple recycling properties to date.Due to cumbersome and difficult to control,it is difficult to realize both high mechanical properties and industrial production with current methods reported in numerous literatures.Herein we demonstrate a new method for the preparation of high-strength silicon-containing elastomer based on the coordination crosslinking reaction between functionalized polysiloxane and rare earth salts(CeCl3·7H2O,EuCl3·6H2O and TbCl3·6H2O,respectively).The functionalized polysiloxane,named poly(dimethyl-methyl(N-nitrile ethyl aminopropyl))siloxane(PANPMS),was syntheiszed by the aza-Michael reaction which having the molecular weight of about 100000 and containing 8%of nitrile groups.The crosslinking reaction occurs in the molding stage,making the preparation process is simple and easy to realize industrialization.These elastomers could achieve high tensile strength(2.58 MPa)and high elongation at break(500%).These data exceed the properties of EA 2900 Sealant of Dow Chemical Company which are 2.1 MPa and 400%,respectively.What’s more,narrow-band red luminescence is observed in EuCl3·6H2O and green luminescence is observered in TbCl3·6H2O when these elastomers are exposure to ultraviolet light.This means that the high-strength elastomer could be used as luminescent materials.The coordination process was detected by X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FT-IR)and vulcanization curves.The vulcanization curves show that the optimum vulcanization conditions is 90°C and 25 min.The torque value in vulcanization curves increase with the content of rare earth salts which means that the vulcanization is closely related to rare earth salts.XPS analysis and FTIR show that the coordinations between nitrile group and rare earth ion take place.Therefore,a conclusion could be drawn that the coordination process plays a role of vulcanization and crosslinking.In addition,it ca
作者
吴连锋
安晨
张悦
周传健
冯圣玉
卢海峰
Lianfeng Wu;Chen An;Yue Zhang;Chuanjian Zhou;Shengyu Feng;Haifeng Lu(School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China;Key Laboratory of Special Functional Aggregated Material,Ministry of Education,Jinan 250100,China;School of Materials Science and Engineering,Shandong University,Jinan 250100,China;Marine Chemical Research Institute Limited Company,Qingdao 266071,China)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2021年第14期1746-1757,共12页
Chinese Science Bulletin
基金
国家自然科学基金(21204043)
山东省自然科学基金(ZR2017MB033)
山东省重大科技创新工程项目(2019JZZY010503,2019QYTPY02)资助。
关键词
含硅弹性体
配位交联
多重循环利用
机械力学性能
silicon containing elastomer
coordination crosslinking
multiple recycling
mechanical properties
