为了设计天然气水合物抑制剂和了解作用机理提供依据,分析两亲性聚酰胺与水相互作用的特征与本质,本文合成了新型水溶性高分子聚柠檬酰丙二胺,在此基础上合成了一种含环己基基团的两亲性聚柠檬酰丙二胺.通过核磁共振波谱、凝胶渗透色谱和示差扫描量热法对产物的结构和性能进行了表征.研究表明,改性的聚柠檬酰胺能形成不可冰冻束缚水,而且比传统的天然气水合物抑制剂聚(N-乙烯基己内酰胺)和聚维酮形成的不可冰冻束缚水多1倍.改性后聚合物中水的比热容增加约36％.聚合物和水之间产生的疏水相互作用,可将水分子更紧密地束缚在聚合物中.改性后的聚合物的疏水性强,造成了水分子彼此紧密束缚程度提高,为不可冰冻束缚水含量的增加提供了必要的环境.
To provide a theoretical basis for designing natural gas hydrate inhibitors and understanding the inhibition mechanism,and to analyze the nature and characteristics of the interactions between amphiphilic polyamides and water,water soluble poly (1,3-propylene citramide) was synthesized and based upon which,a new amphiphilic polymer was prepared by the modification with cyclohexyl isocyanate.The structure and properties of the product were characterized by proton nuclear magntic resonance spectroscopy,gel permeation chromatography and differential scanning calorimetry.The results show that the modified polymer forms nonfreezable bound water(NFBW) and the amount of the NFBW is twice the level in traditional kinetic gas hydrate inhibitors such as poly(N-vinylcaprolactam) or poly (N-vinylpyrrolidone).The specific heat capacities of water in the modified polymer increases remarkably by 36％.The hydrophobic interaction force between the polymer and water is enhanced,resulting in significant hydrophobic hydration restricted in the polymer.The modified polymers show strong hydrophobicity,leading to high levels of tightly bound water molecules and providing a necessary environment for increasing amount of NFBW.
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