Laser flash photolysis of carboxymethylcellulose in an aqueous solution

doi:10.1002/pola.20520

CORC > 北京大学 > 化学与分子工程学院

	Laser flash photolysis of carboxymethylcellulose in an aqueous solution
	Wach, RA ; Kudoh, H ; Zhai, ML ; Muroya, Y ; Katsumura, Y
刊名	journal of polymer science part a polymer chemistry
	2005
关键词	polysaccharides kinetics water-soluble polymers laser flash photolysis carboxymethylcellulose rate constant PULSE-RADIOLYSIS ENERGY TRANSPORT HYALURONIC-ACID CELLULOSE DERIVATIVES POLY(ACRYLIC ACID) HYDRATED ELECTRONS HYDROXYL RADICALS HYDROGEN-PEROXIDE MODEL COMPOUNDS RATE CONSTANTS
DOI	10.1002/pola.20520
英文摘要	Laser flash photolysis with excitation at 248 nm was used to study photo,chemically derived changes of carboxymethylcellulose (CMC) in aqueous solutions. Transient absorption spectra of solutions after photolysis revealed a broad band with a maximum of approximately 720 nm, which could be ascribed to the signal of the hydrated electron. The interaction of the hydrated electron with CMC was slow (<10(7) dm(3) mol(-1) s(-1)), but the OH radical, formed by the decomposition of H2O2, reacted with CMC at a high rate constant (9.5-11.0 x 10(8) dm(3) mol(-1) s(-1)). The rate constant. of the reactions of CMC with hydroxyl radicals depended on the conformation of the macromolecules, which was determined by the pH of the solution. Transient absorption was recorded at a wavelength shorter than 370 nm for CMC solutions photolyzed in the presence of H2O2. As a result of OH attack, long-lived radicals were formed on CMC. The recombination of macroradicals led to the formation of crosslinkina bonds between side-chain groups, and as a result of it an insoluble gel arose in low-pH solutions. (C) 2004 Wiley Periodicals, Inc.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000226319300003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Polymer Science; SCI(E); EI; 5; ARTICLE; 3; 505-518; 43
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/254479]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Wach, RA,Kudoh, H,Zhai, ML,et al. Laser flash photolysis of carboxymethylcellulose in an aqueous solution[J]. journal of polymer science part a polymer chemistry,2005.
APA	Wach, RA,Kudoh, H,Zhai, ML,Muroya, Y,&Katsumura, Y.(2005).Laser flash photolysis of carboxymethylcellulose in an aqueous solution.journal of polymer science part a polymer chemistry.
MLA	Wach, RA,et al."Laser flash photolysis of carboxymethylcellulose in an aqueous solution".journal of polymer science part a polymer chemistry (2005).