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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of polyamideimide-branched siloxane and its gas-separation
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Synthesis and characterization of polyamideimide-branched siloxane and its gas-separation

机译：聚酰胺酰亚胺支化硅氧烷的合成，表征及其气体分离

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Polyamideimide-branched siloxanes (PAIBrSs) were synthesized from 4, 4 prime -(hexafluoroisopropyllidene)diphthalic anhydride (6FDA), p,p prime -oxydianiline (ODA), and aminopropyl-terminated oligomeric dimethylsiloxane (ODMS). In this investigation, a mixture of N-methylpyrrolidinone (NMP) and tetrahydrofuran (THF) was used as a cosolvent for the homogeneous mixing of poly(amic acid) (PA) and the ODMS solution. Thionyl chloride (SOCl2) was used for the acylation of PA to activate the reaction between PA and ODMS. FTIR spectra showed an increase in the intensity of characteristic absorption peaks of dimethylsiloxane units with the amount of ODMS reacted. From thermogravimetric analysis (TGA), PAIBrSs showed good thermal stability, but relatively low thermal stability when compared with that of block poly(imide siloxane) (PIBlS) or poly(amideimide siloxane) (PAIBlS). A solubility test showed that dipolar aprotic solvents were relatively good solvents for the polymer. Gas separation was performed by single gas-permeation equipment. The permeabilities of PAIBrS membranes are higher than those of PIBlS membranes are the selectivities of PAIBrS membranes are lower than those of PIBlS membranes.
机译：聚酰胺亚酰胺支化的硅氧烷（PAIBrSs）由4，4，伯-（六氟异丙基亚丙基）二邻苯二甲酸酐（6FDA），p，p伯-氧二苯胺（ODA）和氨丙基封端的低聚二甲基硅氧烷（ODMS）合成。在这项研究中，使用N-甲基吡咯烷酮（NMP）和四氢呋喃（THF）的混合物作为助溶剂，使聚（酰胺酸）（PA）和ODMS溶液均匀混合。亚硫酰氯（SOCl 2）用于PA的酰化以激活PA和ODMS之间的反应。 FTIR光谱显示，随着反应的ODMS的量，二甲基硅氧烷单元的特征吸收峰的强度增加。根据热重分析（TGA），PAIBrSs表现出良好的热稳定性，但与嵌段聚（酰亚胺硅氧烷）（PIB1S）或聚（酰胺酰亚胺硅氧烷）（PAIBlS）相比，热稳定性较低。溶解度测试表明，偶极非质子溶剂是该聚合物相对较好的溶剂。气体分离是通过单一的气体渗透设备进行的。 PAIBrS膜的渗透性高于PIBlS膜，因为PAIBrS膜的选择性低于PIBlS膜。

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