Synthesis and properties of new aromatic polyimides containing spirocyclic structures. (14th February 2018)

• Record Type: Journal Article
• Authors: Terraza, C.A.; Tagle, L.H.; Santiago-García, J.L.; Canto-Acosta, R.J.; Aguilar-Vega, M.; Hauyon, R.A.; Coll, D.; Ortiz, P.; Perez, G.; Herrán, L.; Comesaña-Gándara, B.; McKeown, N.B.; Tundidor-Camba, A.
• Is Part Of: Polymer. Volume 137(2018)
• Page Start: 283
• Page End: 292
• Publication Date: 2018-02-14
• Subjects: Aromatic polyimides -- Polymer of intrinsic microporosity -- Gas separation membranes; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2018.01.013
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: The synthesis of three novel aromatic polyimides (PIs) containing spiro units is described. These PIs are soluble at room temperature in most common organic solvents, facilitating their processability. Additionally, they are highly thermally stable, with thermal decomposition temperatures (Td10% ) over 500 °C, and had moderately high Tg values between 230 and 265 °C. Robust self-standing thin films were prepared from these polyimides, via the solution casting method, which were suitable for gas transport measurements. The relatively low permeability and selectivity of these PIs, as compared to Polymers of Intrinsic Microporosity (PIMs) that also contain spirocyclic structures, demonstrate the importance of restricting rotation within the polymer chain, which is a key structural feature of the PIMs. Graphical abstract: Image 1 Highlights: Three new aromatic polyimides containing spirocyclic moieties were obtained and evaluated as gas separation membrane. The spirocyclic unit is responsible for the good solubility of the polymers, minimizing the cohesive forces between chains. The requirements of total chain rigidity is mandatory for attaining polymers with high permeability and selectivity.