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首页> 外文期刊>Journal of Applied Polymer Science >PERMEATION AND SORPTION OF CO2 THROUGH AMINE-CONTAINED POLYURETHANE AND POLY(UREA-URETHANE) MEMBRANES
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PERMEATION AND SORPTION OF CO2 THROUGH AMINE-CONTAINED POLYURETHANE AND POLY(UREA-URETHANE) MEMBRANES

机译：含氨的聚氨酯和聚（脲-尿烷）膜对CO2的渗透和吸附

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As an absorbent of CO2, tetraethylenepentamine (TEPA) and/or N-methyldiethanolamine (MDEA) was introduced into the hard segment as chain extenders of the series methane polymer (PU), urea-urethane polymer (PUU), and segmented urethane/urea-urethane copolymer (SPU) based on 4,4'-diphenylmethane diisocyanate (MDI) and either poly(ethylene glycol (PEG)-400 or -600. The obtained polymers thus contained a nearly equal weight composition of both soft and hard segments and were prepared as polymer membranes for permeation and sorption of CO2. The properties of the polymer membranes were characterized using a Fourier transform IR spectrophotometer, thermal gravimetric analysis, and rheometric measurement. The permeation and sorption isotherms as a function of temperature and pressure as well as the activation energy of permeability and diffusivity and the enthalpy change of the solution were measured. The test temperatures were carried out above and below the T-gs of soft-segment domains or the T-gh of hard-segment domains. The steady-state permeability (P) and diffusion coefficients (D) obtained ranged from 1.01 to 12.9 barrer and 1.04 to 4.04 cm(2)/s, respectively, and the solubility coefficients (S), from 0.529 to 3.43 cm(3)(STP)/cm(3) polymer-atm at 10 atm and 35 degrees C. The TEPA-containing polymer membranes showed a smaller P and D but a larger S than did MDEA-containing ones. The membranes comprising PEG-600 exhibit the values of P, D, and S at about 11.5-, 2.5-, and 4.5-fold the PEG-400 ones, respectively. For SPU membranes, above T-gs or T-gh, the pressure dependencies of P followed the modified free-volume model. On the other hand, below T-gs, they exhibited a minimum permeability at a certain pressure caused by the plasticization action of sorbed CO2. The sorption isotherms of CO2 indicated that the membranes comprising PEG-400 can be described by a dual-mode sorption model below T-gs. Also, the SPU polymer membranes obied the Henry's law above T-gs as well as T-gh. The characteristic constants of the sorption model were also determined and are discussed. (C) 1996 John Wiley & Sons, Inc. [References: 38]
机译：作为CO2的吸收剂，将四亚乙基五胺（TEPA）和/或N-甲基二乙醇胺（MDEA）引入到硬链段中，作为系列甲烷聚合物（PU），脲-尿烷聚合物（PUU）和链状尿烷/脲的扩链剂。 -基于4,4'-二苯基甲烷二异氰酸酯（MDI）和聚乙二醇（PEG）-400或-600的氨基甲酸酯共聚物（SPU），所得聚合物包含几乎相同重量的软链段和硬链段，以及制备了可渗透和吸收CO2的聚合物膜，并通过傅里叶变换红外分光光度计，热重分析和流变测量对聚合物膜的性能进行了表征，其渗透和吸附等温线随温度，压力以及温度的变化而变化。测量溶液的渗透率和扩散率的活化能以及焓变，测试温度在软段区域的T-gs以上或以下进行。硬段域的T-gh。获得的稳态渗透率（P）和扩散系数（D）分别为1.01至12.9 barrer和1.04至4.04 cm（2）/ s，溶解度系数（S）为0.529至3.43 cm（3） （STP）/ cm（3）聚合物大气压在10个大气压和35摄氏度的条件下。与含MDEA的相比，含TEPA的聚合物膜的P和D较小，但S较大。包含PEG-600的膜的P，D和S值分别约为PEG-400的11.5、2.5和4.5倍。对于高于T-gs或T-gh的SPU膜，P的压力依赖性遵循修正的自由体积模型。另一方面，在T-gs以下，由于吸附的CO2的增塑作用，它们在一定压力下表现出最小的渗透性。 CO2的吸附等温线表明，包含PEG-400的膜可通过T-gs以下的双模式吸附模型描述。此外，SPU聚合物膜遵守T-gs和T-gh以上的亨利定律。还确定并讨论了吸附模型的特征常数。 （C）1996 John Wiley＆Sons，Inc. [参考：38]

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