受阻酚的自聚集及对丙烯酸脂橡胶阻尼性能的影响  

Self-aggregation of hindered phenols and its effect on damping properties of acrylic rubber

作　　者：马仁博 吴唯 王亮 MA Renbo;WU Wei;WANG Liang(Sino-Germany Joint Research Center of Advanced Materials,School of Materials Science and Engineering,East China University of Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院中德先进材料联合研究中心

出　　处：《南京工业大学学报（自然科学版）》2019年第6期745-754,共10页Journal of Nanjing Tech University(Natural Science Edition)

摘　　要：为了研究受阻酚结构及氢键强度对受阻酚自聚集和丙烯酸酯橡胶阻尼性能的影响,使用了变温红外测试结构不同的受阻酚小分子在晶区和氢键化不同状态下的红外吸收峰,通过吸收峰向低波数移动的程度来表征分子间氢键强度,从小分子自身间氢键和聚合物小分子间氢键共存且竞争的角度解释受阻酚小分子的自聚集现象,并分析了引起丙烯酸酯橡胶/受阻酚阻尼材料性能老化的因素。结果表明,体系中小分子和聚合物间氢键(Δn i)和小分子自身的氢键作用(Δn c)存在竞争,前者起到增溶的效果,而后者促使小分子自聚集并最终结晶析出,体系发生相分离,导致阻尼性能衰减。受阻酚小分子AO300和AO1010的Δn c>Δn i易出现自聚集析出引起阻尼衰减,受阻酚小分子TBBP和Irganox1035的Δn c<Δn i不易出现自聚集的情况。聚合物交联网络能限制小分子的自聚集和迁移析出,从而在一定程度上有效提升丙烯酸酯橡胶/受阻酚阻尼材料的稳定性。In order to study the effects of hindered phenol structure and hydrogen bond strength on the self-aggregation and the damping properties of acrylate rubber,the positions of peaks of different small hindered phenol molecules in crystalline and amorphous regions were measured by temperature-varying FTIR.The intermolecular hydrogen bond strength was characterized by the shift of absorption peak to a lower wave number.The self-aggregation of hindered phenols and damping property of acrylate/hindered phenol hybrid aging in long-term storage were explained from the perspective of competition of intermolecular hydrogen bond.Results showed that in hybrid systems,the poly-small hydrogen bonds(Δn i)competed with the small-small hydrogen bonds(Δn c).The former had solubilizing effect,while the latter promoted the self-aggregation of small molecules and eventually led to crystallization and damping property aging.For hindered phenol AO300 and AO1010 withΔn c>Δn i,damping aging was prone to occur,while foe hindered phenol TBBP and Irganox1035 withΔn c<Δn i,self-aggregation was not easy to occur.Polymer cross-linking networks could limit the self-aggregation and migration of small molecules,thus effectively improved the damping stability of acrylate/hindered phenol hybrid.

关 键 词：阻尼衰减 受阻酚 自聚集 丙烯酸酯橡胶 氢键强度 

分 类 号：TQ333.97[化学工程—橡胶工业]