细乳液聚合法制备Fe_(3)O_(4)/聚(苯乙烯-丙烯酸异辛酯)复合乳液及其胶膜阻尼性能  

Preparation of Fe_(3)O_(4)/poly(styrene-isooctyl acrylate)composite emulsion via miniemulsion polymerization and damping properties of its latex film

作　　者：曹西平 邓伟[1,2] 程冠之 王希 关文勋 谢永江 CAO Xiping;DENG Wei;CHENG Guanzhi;WANG Xi;GUAN Wenxun;XIE Yongjiang(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China;Key Laboratory of Engineering Dielectrics and Application,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;Railway Engineering Research Institute,China Academy of Railway Sciences CO.,LTD.,Beijing 100081,China;State Key Laboratory of High Speed Railway Track Technology,Beijing 100081,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150040 [2]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [4]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《复合材料学报》2024年第1期261-270,共10页Acta Materiae Compositae Sinica

基　　金：中国铁道科学研究院集团有限公司科研基金项目(2020YJ164,2022YJ129);国家自然科学基金(U1934206);黑龙江省自然科学基金联合引导项目(LH2019E059)。

摘　　要：用于制备水性阻尼涂层的苯丙乳液需进一步提升阻尼因子并拓宽有效阻尼温域范围。为改进苯丙乳液阻尼性能,本文以油酸(OA)修饰的纳米Fe_(3)O_(4)(OA-Fe_(3)O_(4))为被包覆填料,采用细乳液聚合法制备了Fe_(3)O_(4)/聚(苯乙烯-丙烯酸异辛酯)(Fe_(3)O_(4)/P(St-2-EHA))复合乳液,使用FTIR、XRD、TEM、SEM、DLS、TG和DMA等方法对复合乳液及其胶膜进行表征,研究了共聚物组成、纳米Fe_(3)O_(4)表面特性与掺量对乳液及胶膜结构与性能的影响。结果表明,OA-Fe_(3)O_(4)颗粒的直接团聚现象减弱,在复合乳液中的分散性显著改善。单体St与2-EHA质量比为5∶5时,所得P(St-2-EHA)胶膜具有最高的损耗因子(tanδ)峰值1.926。当OAFe_(3)O_(4)用量为St、2-EHA总质量的10wt%时,所得Fe_(3)O_(4)/P(St-2-EHA)复合胶膜的性能最佳,其tanδ峰值和有效阻尼温域分别为2.066和59.2℃,均优于纯P(St-2-EHA)胶膜和共混法制备的复合胶膜;其吸水率比后两者分别降低3.4%和10.4%,且初始热分解温度升高,热稳定性改善。The styrene-acrylic emulsion used to prepare waterborne damping coatings needs to further increase the damping factor and broaden the effective damping temperature range.In order to improve the damping per-formance of styrene-acrylic emulsion,oleic acid(OA)modified nano-Fe:O4(OA-Fe:O4)was used as the coated filler to prepare Fe:Os/poly(styrene acrylate)(Fe:Os/P(St-2-EHA))composite damping emulsion via miniemulsion poly-merization.The composite emulsion and its latex film were characterized by FTIR,XRD,TEM,SEM,DLS,TG and DMA.The effects of copolymer composition,surface properties and content of nano-Fe_(3)O_(4) on the structure and performance of the emulsion and latex film were studied.The results show that the direct agglomeration of OA-Fe_(3)O_(4) nanoparticles is weakened,and its dispersion in the composite emulsion is significantly improved.When the mass ratio of monomer St to 2-EHA is 5∶5,the obtained P(St-2-EHA)latex film has the highest loss factor(tan δ)peak(1.926).When the mass ratio of OA-Fe_(3)O_(4) to the total mass of St and 2-EHA is 10wt%,the obtained Fe_(3)O_(4)/P(St-2-EHA)composite latex film has the best performance.Its tanδpeak value and effective damping temperature range width are 2.066 and 59.2℃,which are better than pure P(St-2-EHA)latex film and composite latex film prepared by blending method.Its water absorption rate is 3.4%and 10.4%lower than the latter two respectively.And the initial thermal decomposition temperature is higher,with the thermal stability improved.

关 键 词：Fe_(3)O_(4) 细乳液聚合 包覆 阻尼性能 吸水率 热稳定性 

分 类 号：TQ633[化学工程—精细化工] TB332[一般工业技术—材料科学与工程]