梳状分散剂的合成及分散剂结构和炭黑分散效果的研究,Journal of Polymer Science

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梳状分散剂的合成及分散剂结构和炭黑分散效果的研究
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2019-07-01 , DOI: 10.1002/pola.29433
Travis P. Holbrook ₁ , Georgeta M. Masson ₂ , Robson F. Storey ₁

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适用于稳定汽车润滑油中碳质沉积物的梳状分散剂是由乙烯基醚封端的聚异丁烯（VE-PIB）大分子单体与马来酸酐（MAH）的共聚而得。VE-PIB与MAH的共聚速率和程度受VE-PIB分子量的很大影响。更长的PIB的尾巴施加导致较慢的传播链端的更大的障碍和较低程度的共聚对PIB- ALT -MAH共聚物。PIB-的官能ALT‐MAH与多胺在升高的温度下顺利进行，通过傅立叶变换红外光谱法检测到酸酐延伸消失了。制备了类似的线性和接枝分散剂，以研究体系结构对分散剂物理性能的影响。通过核磁共振，凝胶渗透色谱，热重分析和紫外可见光对中间体和最终分散剂进行表征。使用Langmuir吸附研究和炭黑替代碳质沉积物，发现梳状和接枝分散剂与线性分散剂相比，具有更大的吸附亲和力，但堆积效率却降低。流变学研究表明，粘度与炭黑分散剂/油混合物的负载量成函数关系，也得出了类似的发现。©2019 Wiley Periodicals，Inc.J.Polym。科学，A部分：Polym。化学 2019，57，1682–1696

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Synthesis of comb‐like dispersants and a study on the effect of dispersant architecture and carbon black dispersion

Comb dispersants suitable for stabilization of carbonaceous deposits found in automotive lubricating oils were derived from the copolymerization of vinyl‐ether terminated polyisobutylene (VE‐PIB) macromonomers with maleic anhydride (MAH). The rate and degree of copolymerization of VE‐PIB with MAH was greatly influenced by the molecular weight of the VE‐PIB. Longer PIB tails imposed greater hindrance of the chain end resulting in slower propagation and lower degrees of copolymerization for PIB‐alt‐MAH copolymers. Functionalization of PIB‐alt‐MAH with a polyamine proceeded smoothly at elevated temperatures as evidenced by disappearance of anhydride stretches via Fourier transform infrared spectroscopy. Analogous linear and grafted dispersants were prepared to investigate the influence of architecture on the physical properties of the dispersants. Characterization of the intermediates and final dispersants was conducted by nuclear magnetic resonance, gel permeation chromatography, thermogravimetric analysis, and ultraviolet–visible. Using Langmuir adsorption studies and carbon black as a substitute for carbonaceous deposits, it was found that comb and grafted dispersants exhibit greater affinities for adsorption but decreased packing efficiencies in comparison to linear dispersants. Rheological studies investigating viscosity as a function of loading for dispersant/oil mixtures with carbon black present a similar finding. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1682–1696

更新日期：2019-07-01

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