Rodríguez-González Fidel E, Pérez Germán, Niebla Vladimir, Jessop Ignacio, Martin-Trasanco Rudy, Coll Deysma, Ortiz Pablo, Aguilar-Vega Manuel, Tagle Luis H, Terraza Claudio A, Tundidor-Camba Alain
Research Laboratory for Organic Polymers (RLOP), Department of Organic Chemistry, Pontificia Universidad Católica de Chile, Santiago 7810000, Chile.
Bureau Veritas Laboratories, 7150 Rue Frederick Banting, Saint-Laurent, Montreal, QC H4S 2A1, Canada.
Membranes (Basel). 2020 Jul 4;10(7):141. doi: 10.3390/membranes10070141.
A set of five new aromatic poly(imide)s (PIs) incorporating pendant acyclic alkyl moieties were synthesized. The difference among them was the length and bulkiness of the pendant group, which comprises of linear alkyl chains from three to six carbon atoms, and a -butyl moiety. The effect of the side group length on the physical, thermal, mechanical, and gas transport properties was analyzed. All PIs exhibited low to moderate molecular weights (Mn ranged between 27.930-58.970 Da, and Mw ranged between 41.760-81.310 Da), good solubility in aprotic polar solvents, except for PI--4, which had a -butyl moiety and was soluble even in chloroform. This behaviour was probably due to the most significant bulkiness of the side group that increased the interchain distance, which was corroborated by the X-ray technique ( showed two -spacing values: 5.1 and 14.3 Å). Pure gas permeabilities for several gases were reported ( (Barrer): He(52); H(46); O(5.4); N(1.2); CH(1.1); CO(23); (Barrer): He(139); H(136); O(16.7); N(3.3); CH(2.3); CO(75); (Barrer): He(44); H(42); O(5.9); N(1.4); CH(1.2); CO(27); (Barrer): He(45); H(43); O(6.7); N(1.7); CH(1.7); CO(32)). Consistent higher volume in the side group was shown to yield the highest gas permeability. All poly(imide)s exhibited high thermal stability with 10% weight loss degradation temperature between 448-468 °C and glass transition temperature between 240-270 °C. The values associated to the tensile strength (45-87 MPa), elongation at break (3.2-11.98%), and tensile modulus (1.43-2.19 GPa) were those expected for aromatic poly(imide)s.
合成了一组包含侧链无环烷基部分的五种新型芳香族聚酰亚胺（PI）。它们之间的差异在于侧基的长度和体积，侧基由三到六个碳原子的直链烷基和一个丁基部分组成。分析了侧基长度对物理、热、机械和气体传输性能的影响。所有PI均表现出低至中等的分子量（Mn在27,930 - 58,970 Da之间，Mw在41,760 - 81,310 Da之间），在非质子极性溶剂中具有良好的溶解性，但含丁基部分的PI - 4除外，它甚至可溶于氯仿。这种行为可能是由于侧基体积显著增大导致链间距离增加，X射线技术证实了这一点（显示出两个间距值：5.1和14.3 Å）。报道了几种气体的纯气体渗透率（单位：Barrer：He(52)；H(46)；O(5.4)；N(1.2)；CH(1.1)；CO(23)；单位：Barrer：He(139)；H(136)；O(16.7)；N(3.3)；CH(2.3)；CO(75)；单位：Barrer：He(44)；H(42)；O(5.9)；N(1.4)；CH(1.2)；CO(27)；单位：Barrer：He(45)；H(43)；O(6.7)；N(1.7)；CH(1.7)；CO(32)）。结果表明，侧基中体积一致较大时气体渗透率最高。所有聚酰亚胺均表现出高的热稳定性，10%失重降解温度在448 - 468 °C之间，玻璃化转变温度在240 - 270 °C之间。与拉伸强度（45 - 87 MPa）、断裂伸长率（3.2 - 11.98%）和拉伸模量（1.43 - 2.19 GPa）相关的值是芳香族聚酰亚胺所预期的。
