The Effect of Polymorphism on the Kinetics of Adsorption and Degradation: A Case of Hydrogen Chloride Vapor on Cellulose. (30th April 2018)

• Record Type: Journal Article
• Authors: Niinivaara, Elina; Arshath, Shiek Abdullah Abdul; Nieminen, Kaarlo; Bismarck, Alexander; Kontturi, Eero
• Is Part Of: Advanced sustainable systems. Volume 2:Number 6(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-04-30
• Subjects: acid hydrolysis -- adsorption -- polymorphism -- polysaccharides; Sustainable living -- Periodicals; Sustainability -- Periodicals; Green technology -- Periodicals; Periodicals; 628
• DOI: 10.1002/adsu.201800026
• Languages: English
• ISSNs: 2366-7486

Abstract

Abstract: Control of the reactivity of natural polymers – such as semicrystalline cellulose – through polymorphic transitions is a potent, yet underexplored tool in modern polymer science. Here, the degradation behavior of three artificial cellulose polymorphs (cellulose II, IIII, and IIIII ) in the presence of hydrogen chloride vapor is explored. While the ultimate results of hydrolyses correspond to those found for aqueous HCl, the kinetic scission models exhibit a unique trend for each polymorph, unlike those reported for aqueous acid or enzymatic hydrolyses. In addition to the polymorphic distinctions, these atypical trends are attributed to the nonequilibrium in the hydrolysis set up and the irregular adsorption of HCl molecules to the substrate surfaces. The results point to a new way of approaching the reactivity of natural polymers where polymorphism is regarded as one of the parameters for the kinetics and outcome of chemical reactions. Abstract : Gas/solid system of HCl vapor adsorbing on cellulose demonstrates how different cellulose substrates with distinct polymorphs influence the degradation kinetics in acid hydrolysis of cellulose.