Synthesis of High Molecular Weight Polyetherethersulfone‐Allyl Copolymers of Controlled Glass Transition. Issue 19 (1st August 2016)

• Record Type: Journal Article
• Authors: Faye, Adrien; Furtos, Alexandra; Brisson, Josée
• Is Part Of: Macromolecular chemistry and physics. Volume 217:Issue 19(2016:Oct.)
• Page Start: 2125
• Page End: 2138
• Publication Date: 2016-08-01
• Subjects: degradation -- matrix‐assisted laser desorption/ionization mass spectrometry (MALDI MS) -- polycondensation -- poly(ethersulphones) -- thermal properties; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201600229
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract : Polyetherethersulfones with double bonds inserted along the main polymer chain are synthesized by polycondensation. The glass transition is modulated by increasing the size of aromatic etherethersulfone rigid blocks and decreasing the ratio of flexible allyl segments which contain a double bond. Resulting copolymers have a M n of up to 60 000 g mol −1, moderate polydispersity indices ( Đ or I p ) of 1.70 to 2.11, and are shown, by the presence of a single glass transition temperature in differential scanning calorimetry and by matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) mass spectrometry, to be random. The glass transition of copolymers follows the Gordon–Taylor relationship. The thermal resistance of copolymers increases when decreasing the amount of the flexible segment and increasing the length of the rigid block. Chemical aging of films is investigated by immersion in bleach, which is commonly used to clean membranes. Films show high resistance to bleach, therefore making this approach relevant to membrane fabrication. Abstract : High molecular weight random AB copolyethersulfones bearing double bonds are reported. T g is modulated by varying the relative amount of allyl dichloride and difluoro‐terminated aromatic sulfone as repeat unit A, while using an hydroxyl‐terminated aromatic sulfone repeat unit as repeat unit B. Resulting polymers show resistance to degradation from bleach, and are targeted as materials for membrane fabrication.