Preparation of microencapsulatedα-olefin drag reducing polymer used in oil pipeline transportation

包含油拖减少聚合物粒子的 Microcapsules 被融化散布准备并且聚乙烯蜡压缩，在原处脲和甲醛的聚合，和苯乙烯的界面的聚合分别地。相关过程被一个分子的动力学模拟方法学习，并且 microcapsule 隔离代理人的分子的设计根据模拟被执行。为准备 microencapsulated 油拖减少聚合物粒子的技术被比较并且发行量拖减少 microencapsulated 聚合物粒子的效率基于描述结果和他们的溶解性质被评估。一个 microcapsule 隔离代理人的分子的设计建议石蜡聚合物粒子能被使用能阻止石蜡聚合物粒子的凝块的长链的烷基钠盐表面活化剂稳定地在水里驱散。吸附的模拟的结果处理烷基钠盐表面活化剂的数量能直接影响的表演 microencapsulated 石蜡聚合物粒子的稳定性。并且一定有它的最小的批评数量。在由与不同的壳材料扫描电子显微镜学( SEM )和静态的压力稳定性，特别反应的条件和 microcapsules 的工艺的控制的比较的形态学的描述以后，有poly-(脲甲醛)的石蜡聚合物粒子的 microencapsulation 作为最佳计划作为壳材料被选择，因为它能在温和条件下面反应，它的工艺的过程能在一个大范围被控制。关系拖减少率和显示出的 microcapsules 的溶解时间 microcapsules 的形成没影响最大值拖减少减少每件样品的率的率，和drag 能与溶解时间一起到达大约35%，即 microencapsulation 没影响减少石蜡的性质的drag 聚合物。

Synthesis of comb bipolymers and their pour point depressing properties

A bipolymer maleic anhydride-methyl acrylate(MAMA) was synthesized from maleic anhydride and methyl acrylate based on molecular design. MAMA further reacted with oleylamine or octadecyl alcohol to generate two comb polymers called Oleamide-MAMA(NMAMA) and OctadecanolMAMA(OMAMA), respectively. The structure of both the polymers was confirmed by their infrared spectral analysis(IR), gel permeation chromatography analysis(GPC) and differential scanning calorimeter(DSC). Moreover, the pour point depressing(PPD) properties of these comb polymers were examined experimentally. Experimental results showed that besides the molecular weight and concentration of the polymers, the length of side chains and the number of functional groups also had great influence on the pour point depressing performance. The π bonds and hydrogen bonds between depressants were the key factors for improving the pour point depressing properties. These results suggest that both OMAMA and NMAMA are potential pour point depressants for industry.