以钛酸酯偶联剂(TMC-201)为改性剂,采用超声波分散方法对亲水性纳米二氧化硅(nano-SiO2)进行了表面改性.采用浸渍法将钛酯四丁酯(Ti(OC4H9)4)负载于表面改性的nano-SiO2上,制备了纳米级Ti(OC4H9)4/nano-SiO2负载型催化剂.考察了偶联剂用量、温度、时间对纳米SiO2表面改性的影响,研究了负载时间、负载温度和Ti(OC4H9)4用量对表面改性后纳米SiO2负载Ti(OC4H9)4的影响.结果表明,当TMC-201质量分数为35%、反应温度为90℃、反应时间为3.5h时,纳米SiO2粒子表面接枝的偶联剂量最大;在室温下,负载48 h,Ti(OC4 H9)4用量为表面改性纳米SiO2量的1/2时得到的Ti(OC4H9) 4/nano-SiO2负载型催化剂负载Ti(OC4H9)4量最大;运用ICP-AES、FESEM等测试技术对修饰后的纳米SiO2及Ti(OC4H9) 4/nano-SiO2负载型催化剂进行了表征;将Ti(OC4H9) 4/nano-SiO2负载型催化剂用于聚对苯二甲酸丙二醇酯(PTT)聚酯合成的结果表明,与均相Ti(OC4H9)4催化剂相比,Ti(OC4H9) 4/nano-SiO2负载型催化剂催化合成PTT聚酯过程中酯化时间177 min,与均相催化剂催化酯化时间相近,在缩聚2h后得到PTT的特性粘度高达1.05,证明该负载型催化剂具有高的催化活性,既可催化酯化反应又可催化缩聚反应.
参考文献
[1] | Wang B J,Li C Y,Hanzlicek Je,et al.Poly (trimethylene terephthalate) Crystal Structure and Morphology in Different Length Scales[J].Polymer,2001,42(16):7171-7180. |
[2] | Desborough I J,Hall I H,Neisser J Z.The Structure of Poly(trimethylene terephthalate)[J].Polymer,1979,20(5):545-552. |
[3] | Frisk S,Ikeda R M,Chase D B,et al.Structural Analysis of Poly (trimethylene terephthalate) Fibers and Films Using Polarized Raman Spectroscopy[J].Macromolecules,2004,37 (16):6027-6036. |
[4] | Herbert N,Claus S,Detlef D,et al.Production of Polyesters:US Patent Appl.US3326965[P],1967. |
[5] | Chen K Q,Tang X Z,Shen J,et al.Non-Isothermal Crystallization Behavior of Poly (trimethylene terephthalate) Synthesized with Different Catalysts[J].Macromol Mater Eng,2004,289:539-547. |
[6] | Liu J,Bian S G,Xiao M,et al.Synthesis of High-Molecular Weight Poly (trimethylene terephthalate) Catalyzed by MoO3 Supported Al2O3-TiO2 Catalysts[J].J Appl Polym Sci,2010,115:3401-3408. |
[7] | LI Aiping,HAN Wenjun,CHEN Yushun,et al.Viscometry of Molecular Mass of Polytrimethylene Terephthalate[J].Polyester lnd,2001,14(2):19-22(in Chinese).李爱萍,韩文俊,陈玉顺,等.粘度法测定聚对苯二甲酸丙二醇酯分子质量的研究[J].聚酯工业,2001,14(2):19-22. |
[8] | Fuad M Y A,Ismail Z,Ishak Z A M,et al.Application of Rice Husk Ash as Fillers in Polypropylene:Effect of Titanate,Zirconate and Silane Coupling Agents[J].Eur Polym J,1995,31 (9):885-893. |
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