EA/PU IPN灌浆材料的制备及性能

来源期刊:中南大学学报(自然科学版)2013年第8期

论文作者:刘海霞 王晖 庄彩虹 刘有才 尹健

文章页码:3129 - 3137

关键词:环氧丙烯酸酯(EA);聚氨酯(PU);互穿聚合物网络(IPN);化学灌浆

Key words:epoxy acrylate (EA); polyurethane (PU); interpenetrating polymer network (IPN); chemical grouting

摘    要:在自制的环氧丙烯酸酯(EA)及聚氨酯(PU)预聚体的基础上,制备环氧丙烯酸酯/聚氨酯互穿聚合物网络(IPN)化学灌浆材料,考察聚氨酯预聚体n(—NCO)/n(—OH)、聚氨酯预聚体用量、活性稀释剂用量、引发剂用量、促进剂用量、环境温度等对灌浆材料各方面性能的影响,同时分别采用红外光谱、扫描电子显微镜、热重-差热同步分析仪分析浆材固结体的官能团组成、拉伸断面微观结构及热稳定性。FT-IR表征说明:IPN材料固化时发生聚氨酯预聚体的扩连反应及环氧丙烯酸酯与活性稀释剂的自由基共聚;SEM观察表明:IPN材料的拉伸断面出现韧性断裂特征,两网络之间的聚合与交联限制相分离;TG-DTA曲线表明:IPN材料的热分解温度较高,耐热性能好。制得的聚氨酯预聚体n(—NCO)/n(—OH)为2.5:1,用量为15%时,IPN材料的各项性能达到最佳值,另外,可根据不同的灌浆要求,选择适宜活性稀释剂用量的灌浆材料,浆液胶凝时间可调。

Abstract: Based on the homemade epoxy acrylate(EA) and polyurethane (PU) prepolymer, interpenetrating polymer network (IPN) grouting material was prepared. The effects of n(—NCO)/n(—OH) ratio of polyurethane prepolymer and its dosage on the grouting materials properties were studied as well as the dosage of the reactive diluent, evocating agent and environmental temperature, etc. The curing materials were characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscope (SEM) and thermogravimetry/differential thermal analysis (TG-DTA). From the characterization of FT-IR spectra, it shows that the chain extending reaction of PU preploymer and the free radical copolymerization between EA and reactive diluent occur when the IPN material is curing. There have been ductility fracture characteristics on tensile section from the analysis of SEM images due to the limitation of phase disengagement on the basis of the polymerization and crosslinking of the network structures. TG-DTA analysis indicates that the decomposition temperature of IPN material is relatively high with a good heat resistance. Each performance of IPN material achieves to a best situation when the n(—NCO)/n(—OH) of the homemade PU prepolymer is 2.5:1 with a dosage of 15% which compares to the dosage of EA. Moreover, according to different grouting requirements, suitable concentration of grouting material diluted by reactive diluent can be selected, and the gel time of the material is adjustable.

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