文献类型：期刊文献

英文题名：Kinetic Hydrate Inhibitors: Structure-Activity Relationship Studies on a Series of Branched Poly(ethylene citramide)s with Varying Lipophilic Groups

作者：Reyes, Fernando T.[1];Kelland, Malcolm A.[1];Sun, Li[2,3];Dong, Jian[2]

机构：[1]Univ Stavanger, Fac Sci & Technol, Dept Math & Nat Sci, N-4036 Stavanger, Norway;[2]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[3]Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 315211, Zhejiang, Peoples R China

年份：2015

卷号：29

期号：8

起止页码：4774

外文期刊名：ENERGY & FUELS

收录：SCI-EXPANDED(收录号：WOS:000360026700012)、、EI(收录号：20153401203021)、Scopus(收录号：2-s2.0-84939817964)、WOS

基金：This work was supported by the Natural Science Foundation of Zhejiang Province (LY12E03001) and the Department of Science and Technology of Zhejiang Province of China (2012C24003).

语种：英文

外文关键词：Amides - Amines - Ethylene - Gas hydrates - Hydration - Hydrogen bonds - Metabolism - Natural gas substitutes - Nuclear magnetic resonance - Polymer blends - Structures (built objects) - Synthetic aperture radar - Urea

外文摘要：Novel citric-acid-based polyamides were synthesized by polycondensation reactions using tributyl citrate (TBC) and ethylene diamine (EDA), producing hyperbranched poly(ethylene citramide)s with NH2 termini, which were functionalized with isopropyl, n-butyl, and cyclohexyl groups via the urea group. Characterization was carried out by H-1 and C-13 nuclear magnetic resonance (NMR) spectroscopic techniques. Molecular weights in this polymer family varied from 3000 to 10 000 Da. The activity of this polymer family as gas hydrate kinetic inhibitors (KHIs) was evaluated for the first time. Constant cooling (1 degrees C/h) experiments were carried out in high-pressure steel rocking cells using a synthetic natural gas that preferentially forms structure II gas hydrates. The best KHI performance was given by poly(ethylene citramide) CONHCyHe with pendant N-cyclohexyl groups (M-n = 5.65 X 10(3), and M-w = 1.14 X 10(4)). A structure-activity relationship (SAR) analysis of the KHI test results supports the hypothesis that increasing the size of the lipophilic groups increases the KHI performance as long as water solubility is maintained through hydrogen bonding via the amide and/or urea functional groups.