响应面法优化制备戊烯/辛烯/十二烯共聚物减阻剂

采用溶液聚合法，选用Ziegler-Natta催化剂，将1-戊烯作为单体之一，合成了1-戊烯/1-辛烯/1-十二烯三元共聚物减阻剂，通过核磁共振仪（¹³C NMR）、傅里叶变换红外光谱计（FT-IR）、X射线衍射（XRD）对聚合物的结构与性质进行了表征，并采用室内环道装置评价了聚合物的减阻性能。采用响应面分析法通过建立减阻率与各因素之间的Box-Behnken数学模型，对三元共聚工艺进行优化，最优聚合条件为：戊烯量0.07 ml，十二烯：辛烯=4，主催化剂量0.07 g，助催化剂量0.4 ml，在此条件下得到的三元共聚物在添加量10×10^-6时减阻率为59.79%。在实验选取的添加量范围内，各因素对减阻率影响显著性顺序为：戊烯添加量 >助催化剂用量 >主催化剂用量 >十二烯：辛烯；各因素之间的交互作用也显著存在。引入戊烯制备所得的减阻剂结晶度下降，溶解效果明显优于1-辛烯/1-十二烯二元共聚物，减阻率得到了提高。

Preparation of 1-pentene/1-octene/1-dodecene terpolymer drag reducer by response surface method

Using 1-pentene as one of the monomers, Ziegler-Natta catalyst as catalyst, 1-pentene/1-octene/1-dodecene terpolymer was synthesized by solvent polymerzation. The terpolymer was characterized by ¹³C NMR, FT-IR and XRD. The drag reduction efficiency of the terpolymer was evaluated by an indoor loop pipeline experimental apparatus. The Box-Behnken mathematical relational model between drag reduction rate and affecting factors was established, and the technology of preparing terpolymer was optimized. The optimum preparation conditions were: 0.07 ml 1-pentene, dodecene:octene=4, 0.07 g main catalyst, 0.4 ml cocatalyst, when the dosage of the terpolymer is 10×10^-6, the drag reduction rate is 59.79%. The order of main factors affecting the drag reduction rate was: 1-pentene >cocatalyst >catalyst >dodecene:octene in the range of the experiment selected. The combined influence of the factors was also outstanding. The crystallinity of synthetic terpolymer was significantly decreased due to the introduction of 1-pentene, the solubleness was much better than 1-octene/1-dodecene bipolymer, and the drag reduction rate was improved.