Dahlquist

After some early uncertainty in the literature about the nature of the pressure sensitive bond, Dahlquist [5,6] related modulus data to tack-temperature studies and observed that the compression modulus of the adhesive had to be less than about 3 X 10 dyne/cm (3 x lO Pa) before any adhesive tack was observed. This was explained as the highest modulus that still allowed the adhesive to be sufficiently compliant to wet out or come into molecular contact with the substrate and form dispersive bonds. As other investigators [7-9] accepted this requirement it was termed the Dahlquist Criterion . 

The authors are grateful to 3M for its support in preparing this review and to their many colleagues who have contributed their knowledge over the years. Special thanks are due to C.A. Dahlquist for his many contributions and his unflagging enthusiasm for the field. 

Dahlquist, C.A., Creep. In Satas, D. (Ed.), Handbook of Pressure Sensitive Adhesive Technology. Van Nostrand Reinhold, New York, 1989, p. 97. 

In 1950, Dahlquist et al. [82] reported the use of polyvinyl A -alkyl carbamates as PSA release materials. Since then, many other types of alkyl side chain polymers have been patented for use as release coatings, including copolymers based on higher alkyl acrylates or methaci ylates [83-86], polyvinyl esters of higher aliphatic fatty acids [87], higher alkyl vinyl esters or ethers and a maleic... 

Tackifying resins enhance the adhesion of non-polar elastomers by improving wettability, increasing polarity and altering the viscoelastic properties. Dahlquist [31 ] established the first evidence of the modification of the viscoelastic properties of an elastomer by adding resins, and demonstrated that the performance of pressure-sensitive adhesives was related to the creep compliance. Later, Aubrey and Sherriff [32] demonstrated that a relationship between peel strength and viscoelasticity in natural rubber-low molecular resins blends existed. Class and Chu [33] used the dynamic mechanical measurements to demonstrate that compatible resins with an elastomer produced a decrease in the elastic modulus at room temperature and an increase in the tan <5 peak (which indicated the glass transition temperature of the resin-elastomer blend). Resins which are incompatible with an elastomer caused an increase in the elastic modulus at room temperature and showed two distinct maxima in the tan <5 curve. 

Flynn, G. C., Beckers, C. J. M., Baase, W. A., and Dahlquist, F. W. (1993). Individual subunits of bacterial luciferase are molten globules and interact with molecular chaperones. Proc. Natl. Acad. Sci. USA 90 10826-10830. 

Dahlquist KD, Salomonis N, Vranizan K, Lawlor SC, Conklin BR. GenMAPP, a new tool for viewing and analyzing microarray data on biological pathways. Nat Genet 2002 31 19-20. 

Chelsky, D., and Dahlquist, F.W. (1980) Chemotaxis in Escherichia coli Association of protein components. Biochemistry 19, 4633 1639. 

Smith, R.J., Capaldi, R.A., Muchmone, D., and Dahlquist, F. (1978) Cross-linking of ubiquinone cytoch-nome c reductase (complex III) with periodate-cleavable bifunctional reagents. Biochemistry 17, 3719-3723. 

An alternative decomposition can be performed using a Q-R factorization of matrix A2 to decouple the unmeasured variables from the measured ones (Sanchez and Romagnoli, 1996). Let us state the following theorem (Dahlquist and Bjork, 1974). 

Dahlquist, G., and Bjork, A. (1974). Numerical Methods. Prentice-Hall, Englewood Cliffs. NJ. 

Maltose, the endproduct of amylase activity, was measured by the method of Dahlquist (16). 3Peptide=supernatant protein which was not precipitated when trichloroacetic acid (TCA) solution was added to 5% TCA (W/V) (17). 

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