铝酸酯偶联剂改性重钙和SEBS对回收PS材料的增韧补强研究  

Study on the Aluminate Coupling Agent Modified Heavy Calcium and SEBS Toughened and Reinforced Recycled PS

作　　者：王花 杨玉婷 易春旺[1,2,3] WANG Hua;YANG Yu-ting;YI Chun-wang(College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China;Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province,Changsha 410081,China;National and Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources,Changsha 410081,China)

机构地区：[1]湖南师范大学化学化工学院,中国长沙410081 [2]资源精细化与先进材料湖南省高校重点实验室,中国长沙410081 [3]"石化新材料与资源精细利用"国家地方联合工程实验室,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2018年第6期44-50,81,96,共9页Journal of Natural Science of Hunan Normal University

基　　金："十三五"国家重点研发专项资助项目(2016YFB0302702);湖南省教育厅重点资助项目(17A126)

摘　　要：回收聚苯乙烯(PS)材料(以废旧一次性牙刷为例)性脆且耐热性差,需改性再生才能使用.通过铝酸酯偶联剂改性重质碳酸钙制备粒径均匀的亚微米改性重钙,并将改性重钙和聚苯乙烯—聚乙烯—聚丁烯—聚苯乙烯(SEBS)用于PS的增韧补强改性.傅立叶红外光谱(FTIR)分析表明,重钙表面在改性过程中与铝酸酯偶联剂的亲无机端发生了化学反应;在偏光显微镜(POM)下,改性重钙的粒径和未改性重钙相比明显减小,且分散更为均匀;粒径分析结果表明,当铝酸酯偶联剂质量分数为1.7%时,改性重钙的粒径最小且分布最集中;扫描电镜(SEM)结果显示,SEBS加入PS基体后,复合材料的拉伸断面由光滑变为粗糙,材料最终实现了脆韧转变.绝大多数改性重钙颗粒均匀分散在PS树脂基体中,普通重钙颗粒则明显团聚;相应地,力学性能测试结果表明,增韧剂SEBS可以有效提高PS复合材料体系的冲击强度和断裂伸长率,改性重钙对PS的增韧补强效果均优于普通重钙.Recycled polystyrene(PS)materials(e.g.disposable toothbrushes)cannot be reused before modification because of their disadvantages of brittleness and poor heat resistance.To overcome these disadvantages,in this study,uniform submicron particles of heavy CaCO3 modified by aluminate coupling agent were prepared firstly.Then,the modified heavy CaCO3 was used in toughening and strengthening recycled PS,in company with SEBS.The infrared spectrum analysis indicated that alkane chains of aluminate coupling agents were chemically bonded to the surface of heavy CaCO3.Compared to unmodified heavy CaCO3,the particle size of modified heavy CaCO3 was distinctly reduced and more uniform particle size distributions were observed by polarizing microscope.When the content of aluminum coupling agent reached 1.7 wt%,the particle size of modified heavy CaCO3 was found to be smallest and most concentrated.Scanning electron microscopy(SEM)results discovered that most of the modified heavy CaCO3 particles were uniformly dispersed in the PS resin matrix,while the unmodified heavy CaCO3 particles were seriously agglomerated.After adding SEBS to the PS resin matrix as the toughening agent,the fracture surface of the composites changed from smooth to rough,which verifies that the material successfully underwent the brittle-to-ductile transition.Our results of mechanical properties for those materials further confirmed that the modified CaCO3 material was better than the unmodified heavy CaCO3 material in toughening and reinforcing PS.

关 键 词：回收PS 铝酸酯改性重钙 SEBS 增韧补强 

分 类 号：TQ327[化学工程—合成树脂塑料工业]