Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Glen Thomas Cunkle is active.

Publication


Featured researches published by Glen Thomas Cunkle.


Journal of Photochemistry and Photobiology A-chemistry | 2002

A dramatic solvent effect on high-yield pulp yellowing inhibition for a benzophenone-based ultraviolet absorber

Peter F. McGarry; Cyril Heitner; John A. Schmidt; Andrew Rodenhiser; R. St. John Manley; Glen Thomas Cunkle; Thomas Friend Thompson

Abstract UV screens used to photostabilise high-yield pulp do not work as well when deposited from water as they do when deposited from organic solvents. For a water-soluble ultraviolet absorber (UVA) based on 2-hydroxybenzophenone, the water-effect is dramatic. For example, during light exposure a 78% ISO brightness paper sheet made from lignin-containing peroxide bleached softwood thermomechanical pulp (BTMP) lost 27 brightness points. A BTMP sheet treated with 0.5% by weight of the UVA 5-benzoyl-4-hydroxy-2-methoxy-benzenesulfonic acid, 1 (Uvinul MS40™) delivered from ethanol lost only 19 brightness points. However, a sheet treated with 0.5% of the same UVA from water lost 25 brightness points. For a benzotriazole UVA, 5-benzotriazolyl-4-hydroxy-3- sec -butyl-benzenesulfonic acid, 2 (Cibafast W™) the adverse water-effect is smaller. Our experiments suggest several reasons for the poor performance of aqueous-delivered 1 : attenuation and broadening of the absorption spectra on paper when the additive is delivered from water, disruption of the internal hydrogen bond, partial formation of phenolate ion, and changes in the distribution of the additive through the thickness of the paper sheet. This effect has been found to be general across several water-soluble benzophenone- and benzotriazole-type UVAs. One exception to the rule is found for a benzotriazole that has a PEO side chain on the hydroxyphenyl ring. Thus, choice of solvent used in testing new paper stabilisers is of central importance to stabiliser performance.


Archive | 1999

Inhibition of pulp and paper yellowing using hydroxylamines and other coadditives

Raymond Seltzer; David Devore; Glen Thomas Cunkle; Cyril Heitner; John A. Schmidt; Peter F. McGarry; Jean-Pierre Wolf; Randall B. Nelson


Archive | 2001

Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives

Raymond Seltzer; Jean-Pierre Wolf; Cyril Heitner; John A. Schmidt; Peter F. McGarry; Glen Thomas Cunkle; Randall B. Nelson


Archive | 1998

Derivatives of 1-oxyl-4-amino-2,2,6,6-tetramethylpiperidine as polymerization inhibitors for (meth)acrylate monomers

Glen Thomas Cunkle; Matthew Edward Gande; Raymond Seltzer; Thomas Friend Thompson


Archive | 1997

1,2-bis-adducts of stable nitroxides with substituted ethylenes and stabilized compositions

Glen Thomas Cunkle; Thomas Friend Thompson; Volker H. von Ahn; Roland A.E. Winter


Archive | 2000

Polymeric stabilizers with high affinity to pulp

Glen Thomas Cunkle; David Devore; Thomas Friend Thompson


Archive | 2000

Chlorohydrin and cationic compounds having high affinity for pulp or paper

Glen Thomas Cunkle; David Devore; Thomas Friend Thompson


Archive | 1999

Derivatives of 1-oxyl-4-hydroxy-2,2,6,6-tetramethylpiperidine

Glen Thomas Cunkle; Matthew Edward Gande; Raymond Seltzer; Thomas Friend Thompson


Archive | 1999

Process for the synthesis of 4-substituted N-[(alk-2-en-1-yl)oxy]-and N-aralkyloxy-2,2,6,6-tetraalkylpiperidines

Joseph Edmund Babiarz; Stephen Daniel Pastor; Glen Thomas Cunkle


Archive | 1997

Hemmung der Polymerisation von vinylaromatischen Monomeren

Glen Thomas Cunkle; Thomas Friend Thompson; Ahn Volker Hartmut Von; Roland A. E. Winter

Collaboration


Dive into the Glen Thomas Cunkle's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

David Devore

Ciba Specialty Chemicals

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge