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{"title":"Reduction of mesoporous poly(ether ether ketone) materials, preserving pore size","authors":"Sagiv Weintraub, Gary Gellerman, Andrii Bazylevich, Ben Bikson","doi":"10.1002/pi.6618","DOIUrl":null,"url":null,"abstract":"<p>Poly(ether ether ketone) (PEEK) is an important high-performance engineering polymer that is used extensively in numerous engineering applications that require chemical, solvent and thermal resistance. These attributes make PEEK attractive for the preparation of porous materials and membranes. Chemical modifications of preformed porous PEEK materials can expand the utilization of PEEK in a range of applications. It is desirable to carry out chemical functionalization without affecting the preformed porous structure or the degree of polymer crystallinity responsible for the sought-after properties. We report here on the heterogeneous functionalization of preformed mesoporous PEEK materials with hydroxyl groups using sodium borohydride as a reducing agent in a poly(ethylene glycol)/tetrahydrofuran solvent mixture. The pore structure of functionalized materials was characterized, and the degree of modification with functional groups was measured as a function of reaction protocol. The methodology was applied to the preparation of porous PEEK materials in the form of beads and hollow fibers that differed in semicrystalline morphology and pore structure. The degree of surface modification by –OH groups in reduced PEEK (PEEK-OH) porous materials was determined quantitatively by measuring the carbocation adduct concentration formed upon the dissolution of PEEK-OH in sulfuric acid using UV–visible spectroscopy. Bis(4-(4-methoxyphenoxy)phenyl)methanone was used to optimize the reaction condition protocol. The degree of crystallinity and pore structure of the functionalized articles were largely preserved following modification. © 2024 Society of Industrial Chemistry.</p>","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 6","pages":"471-477"},"PeriodicalIF":2.9000,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer International","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/pi.6618","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
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Abstract
Poly(ether ether ketone) (PEEK) is an important high-performance engineering polymer that is used extensively in numerous engineering applications that require chemical, solvent and thermal resistance. These attributes make PEEK attractive for the preparation of porous materials and membranes. Chemical modifications of preformed porous PEEK materials can expand the utilization of PEEK in a range of applications. It is desirable to carry out chemical functionalization without affecting the preformed porous structure or the degree of polymer crystallinity responsible for the sought-after properties. We report here on the heterogeneous functionalization of preformed mesoporous PEEK materials with hydroxyl groups using sodium borohydride as a reducing agent in a poly(ethylene glycol)/tetrahydrofuran solvent mixture. The pore structure of functionalized materials was characterized, and the degree of modification with functional groups was measured as a function of reaction protocol. The methodology was applied to the preparation of porous PEEK materials in the form of beads and hollow fibers that differed in semicrystalline morphology and pore structure. The degree of surface modification by –OH groups in reduced PEEK (PEEK-OH) porous materials was determined quantitatively by measuring the carbocation adduct concentration formed upon the dissolution of PEEK-OH in sulfuric acid using UV–visible spectroscopy. Bis(4-(4-methoxyphenoxy)phenyl)methanone was used to optimize the reaction condition protocol. The degree of crystallinity and pore structure of the functionalized articles were largely preserved following modification. © 2024 Society of Industrial Chemistry.
还原介孔聚醚醚酮材料,保持孔径大小
聚醚醚酮(PEEK)是一种重要的高性能工程聚合物,广泛应用于需要耐化学性、耐溶剂性和耐热性的众多工程应用领域。这些特性使 PEEK 在制备多孔材料和薄膜方面具有吸引力。对预制多孔 PEEK 材料进行化学改性可以扩大 PEEK 的应用范围。我们希望在不影响预成型多孔结构或聚合物结晶度的情况下进行化学功能化,从而获得所需的性能。我们在此报告在 PEG-400/THF 溶剂混合物中使用硼氢化钠作为还原剂,用羟基对预成型介孔 PEEK 材料进行异构官能化的情况。对功能化材料的孔隙结构进行了表征,并测量了功能基团的改性程度与反应方案的函数关系。该方法适用于制备珠状和中空纤维 (HF) 形式的多孔 PEEK 材料,这些材料的半结晶形态和孔隙结构各不相同。还原型 PEEK(PEEK-OH)多孔材料中 -OH 基团的表面改性程度是通过使用 UV-VIS 光谱法测量 PEEK-OH 在硫酸中溶解时形成的碳化加合物浓度来定量测定的。双(4-(4-甲氧基苯氧基)苯基)甲酮用于优化反应条件方案。改性后,功能化物品的结晶度和孔隙结构基本保持不变。
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