摘要
为了提高废旧丙烯腈-丁二烯-苯乙烯(wABS)的利用效率,研究了wABS和二苯基甲烷二异氰酸酯(MDI)的流变性、耐热性、动态力学性能、断面形貌和力学性能.MDI含量分别为0 wt%、0.3 wt%、0.6 wt%、0.9 wt%、1.2 wt%和1.5 wt%,通过化学反应制备wABS/MDI共混物.流变学结果表明,MDI的引入导致了分子链的缠结,提高了改性样品的粘度和分子量.动态力学分析(DMTA)的储存模量和玻璃化温度(Tg)升高,这与流变学分析的结果一致,说明改性后的样品中wABS中断链得到修复,且只有一个Tg峰,说明MDI与wABS的相容性较好.热重分析(TG)表明,添加MDI后,wABS的热稳定性得到了改善.扫描电镜(SEM)表明,改性后样品两相界面更模糊.随着MDI含量的不断增加,拉伸性能显著提高,6#比1#提高了9.8%,但冲击强度受到影响,这是由于MDI和wABS在熔融混合后发生的化学反应导致.
In order to improve the utilization efficiency of waste acrylonitrile-butadiene-styrene(wABS),the rheological,heat resistance,dynamic mechanical properties and mechanical properties of wABS and diphenylmethane diisocyanate(MDI)were studied.The MDI contents were 0,0.3,0.6,0.9,1.2 and 1.5 wt%,and the wABS/MDI blends were prepared by chemical reaction.The rheological results show that the introduction of MDI leads to the entanglement of molecular chains and improves the viscosity and molecular weight of the modified samples.The storage modulus and vitrification temperature(T_g)of dynamic mechanical analysis(DMTA)increased,which were consistent with the results of rheological analysis,reflecting that the wABS interrupt chain was repaired in the modified samples.Besides,there is only one T_g peak,indicating that the compatibility between MDI and wABS was good.Thermogravimetric analysis(TG)showed that the thermal stability of wABS was improved after adding MDI.Scanning electron microscopy(SEM)showed that the interface of the modified samples were more blurred.With the continuous increase of MDI content,the tensile performance was significantly improved,with 6#increasing by 9.8%compared with 1#,but the impact strength was affected.This is due to the chemical reaction of MDI and wABS after melting and blending.
作者
叶青霞
李真
刘瑾
YE Qing-xia;LI Zhen;LIU Jin(School of Materials Science and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China)
出处
《安徽化工》
CAS
2020年第4期33-37,共5页
Anhui Chemical Industry
基金
安徽省重大科技攻关项目(编号:17030901105)。
