摘要
为提升聚苯乙烯-丁二烯-苯乙烯热塑性弹性体(SBS)的力学性能,选择白炭黑(SiO_(2))作为补强填料,但非极性SBS与极性的SiO_(2)界面结合力弱导致SBS/SiO_(2)复合材料性能提升受阻。为提升SBS与极性SiO_(2)的相容性,采用SBS接枝羧基的改性方法,SBS中的羧基与SiO_(2)表面羟基形成氢键,提高了SiO_(2)与SBS分子链之间的相互作用力。本文利用硫-烯烃点击化学反应,使用巯基丙酸(MPA)对自制SBS进行接枝改性,从反应温度、反应时间、接枝单体浓度、引发剂浓度四方面研究SBS的点击化学反应,实现了SBS的定量接枝,接枝率最高可达到21%。在SiO_(2)的质量分数为5%时,SBS-gMPA/SiO_(2)复合材料的性能比SBS/SiO_(2)复合材料拉伸强度提升54.1%、断裂伸长率提升2%,同时提升了SiO_(2)在SBS基体中的分散性,抑制了SiO_(2)的团聚。
In order to improve the mechanical properties of SBS,SiO_(2)is chosen as a reinforcing filler.However,the weak interfacial bonding between non-polar SBS and polar SiO_(2)hinders the improvement of the performance of SBS/SiO_(2)composite materials.To improve the compatibility between SBS and polar filler SiO_(2),a modification method of SBS polar grafting carboxyl groups is adopted.The carboxyl groups in SBS form hydrogen bonds with the hydroxyl groups on the surface of SiO_(2),enhancing the interaction force between SiO_(2)and SBS molecular chains.Sulfur olefin click chemistry reaction is used to graft modify self-made SBS with mercaptopropionic acid(MPA).The click chemistry reaction of SBS is studied from four aspects:reaction temperature,reaction time,grafting monomer concentration,and initiator concentration.The quantitative grafting of SBS is achieved,and the grafting rate up to 21%.When the SiO_(2)dosage is 5%(mass),the performance of SBS-g-MPA/SiO_(2)composite material is improved by 54.1%in tensile strength and 2%in elongation at break compared to SBS/SiO_(2)composite material.At the same time,the dispersion of SiO_(2)in SBS matrix is improved,inhibit the aggregation of SiO_(2).
作者
刘佳鑫
李嵬
于胜楠
刘晓杰
胡静
LIU Jiaxin;LI Wei;YU Shengnan;LIU Xiaojie;HU Jing(Shenyang Research Institute of Chemical Industry,Shenyang 110021,China)
出处
《弹性体》
2025年第6期9-15,共7页
China Elastomerics
基金
沈阳化工研究院有限公司自主投入项目(2024-材料-13)。
关键词
热塑性弹性体
点击反应
接枝改性
力学性能
thermoplastic elastomers
click reaction
graft modification
mechanical property
