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负载钛体系催化1-丁烯均聚和共聚及其聚合物性能研究

Homopolymerization and Copolymerization of 1-Butene with Supported Titanium Catalyst System and Properties of Polymer

【作者】 王波

【导师】 黄宝琛;

【作者基本信息】 青岛科技大学 , 高分子化学与物理, 2006, 硕士

【摘要】 以氢气为相对分子质量调节剂,采用自制的TiCl4/MgCl2-Al(i-Bu)3负载钛催化体系,合成了聚1-丁烯热塑性弹性体(PBt-TPE)。在3L釜中考察了Al/Ti、Ti/Bt、氢气压力及聚合温度对单体转化率、特性黏数、乙醚中不溶物含量及结晶度的影响。结果表明:当[Bt]=50Wt%,T=30~40℃,Al/Ti=300,Ti/Bt=3x10-5,P=0.8MPa时,催化体系有最佳的催化效率。随着聚合温度的升高,所得的PBt的特性黏数先升高后下降,其在乙醚中的不溶物含量先提高后降低。氢气对PBt特性黏数的调节显著:随聚合过程中氢气压力的提高,所得PBt的特性黏数先升高后下降。DSC测试表明:PBt在聚合温度为30℃时玻璃化温度最高,为-16.2℃;本聚合物存在两个结晶峰,聚合温度为40℃所得PBt的两种晶型的结晶峰熔点均最高,分别为110.3℃和98.3℃。聚合物各项力学性能由相对分子质量决定。随聚合温度的上升,拉伸强度、撕裂强度、100%定伸应力和300%定伸应力以及硬度均先上升后下降,在T=30~40℃处各项力学性能达到最佳。 丁烯-1与己烯-1共聚实验(PBH)结果表明:本聚合实验(己烯-1的摩尔百分含量为20%)较适宜的聚合条件为:T=40~50℃,Al/Ti=400~500,Ti/BH=3~4x10-5。随着聚合温度的升高,共聚物的特性粘数下降,其在二氯甲烷中的不溶物含量下降。单体中己烯—1含量增加也使共聚物在二氯甲烷中的不溶物含量下降,表明己烯—1的加入对共聚物微观结构有着明显的影响,破坏了聚丁烯—1的结晶度。随着共聚物PBH中己烯初始摩尔含量的增加,PBH的刚性和强度大幅下降,断裂伸长率显著提高。当己烯初始摩尔含量达到7%以后时,PBH结晶度降至最低,强度和刚性迅速降至最低值,伸长率则迅速增大,之后均趋于稳定。PBH对PP具有明显的增韧改性效果,随着PBH用量的增加,共混物的拉伸强度、弯曲强度、硬度、耐热性均呈下降趋势,而断裂伸长率和冲击强度均显著提高。己烯摩尔初始含量为30%的丁烯-己烯共聚物作为纳米CaCO3的载体,其分散性及其加工性良好。用两者的混合体填充改性PP效果较好。 丁烯-1与乙叉降冰片烯(ENB)共聚结果表明:转化率随ENB/Bt-1上升而下降,随Al/Ti和聚合温度的上升而先上升后下降,适宜的聚合条件为

【Abstract】 With the addition of Hydrogen as a relative molecular mass regulator and TiCl4/MgCl2-Al(i-Bu)3 catalyst system, Polybutene-1-thermoplastic elastomer (PBt) was synthesized in 3L autoclave. The conversion, [η], insoluble content in Ether and crystallization of PBt-TPE were studied under various polymerization conditions such as Hydrogen pressure, temperature, Al/Ti and Ti/Bt ratio. It was showed that the optimal polymerization conditions are: [Bt]=50wt%, Ti/Bt=3×10-5, Al/Ti=300(mol/mol), T=3040℃ 。 With the increasing of the polymerization temperature, the [η] and the insoluble content in Ether of PBt will increase first and then decrease. Hydrogen is an efficient modifier of the relative molecular mass of PBt. The [η] of PBt will increase first and then decrease with the increasing of hydrogen added in the process of polymerization. DSC curve shows that PBt have two melt peaks while the temperature condition is 40℃, the melt point(Tm) are respectively 110.3 ℃ and 98.3℃;The most tallest glass transition temperature is -16.2℃ when temperature is 30℃. The properties of low relative molecular mass PBt were determined by relative molecular mass of PBt. With the increasing of polymerization temperature and Al/Ti, Tensile strength,Tear strength ,Modulus at 100% and 300% ,Hardness will increase first and then decrease. There is the optimal properties when temperature is 3040℃.The experiments of copolymerization between butane-1 and hexane-l(PBH) showed: the optimal polymerization conditions (molar content of He-1 was 20%) were: T=4050℃, Al/Ti=400500, Ti/BH=3 4×10-5. With the increasing of the polymerization temperature, the [η] and the insoluble content in CH2Cl2 of copolymers of butylene-1 and hexene-1 would decrease. And the increasing of the content of

  • 【分类号】O631.3
  • 【被引频次】15
  • 【下载频次】367
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