Temperature Dependence of the Adhesion of High Polymers to Cellulose

Hofrichter, Charles H.; McLaren, A. D.

doi:10.1021/ie50458a030

Cited by 13 publications

(4 citation statements)

References 4 publications

(5 reference statements)

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“…In an investigation of the fundamentals of adhesion, Hofrichter & McLaren (1948) found that the adhesion of a polymer containing polar carboxyl groups to regenerated cellulose increased in a manner expressable by the equation:…”

Section: Results a N D Discussionmentioning

confidence: 99%

“…The addition of magnesium or calcium stearate to the tablet was found to decrease the adhesion, but the addition of stearic acid caused a significant increase. The effect of lubricant concentration on the adhesion could be expressed by an equation similar to that proposed by Hofrichter & McLaren (1948) for the adhesion of vinyl chloride/vinyl acetate copolymers to regenerated cellulose.…”

mentioning

confidence: 99%

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The adhesion of film coatings to tablet surfaces - the effect of some direct compression excipients and lubricants

Rc¹

1977

Journal of Pharmacy and Pharmacology

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The effect of some direct compression excipients and lubricants on the adhesion of hydroxypropyl methyl cellulose films has been examined using a specially designed tensile testing apparatus (Fisher & Rowe, 1976). The adhesion was found to be influenced by both the roughness, including microporosity, of the tablet surface and its polarity. Tablets prepared from microcrystalline cellulose showed very high adhesions despite having relatively smooth surfaces, owing to the surface being saturated with hydroxyl groups able to form hydrogen bonds with the corresponding groups on the polymer. The addition of magnesium or calcium stearate to the tablet was found to decrease the adhesion, but the addition of stearic acid caused a significant increase. The effect of lubricant concentration on the adhesion could be expressed by an equation similar to that proposed by Hofrichter & McLaren (1948) for the adhesion of vinyl chloride/vinyl acetate copolymers to regenerated cellulose.

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Section: Results a N D Discussionmentioning

confidence: 99%

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confidence: 99%

The adhesion of film coatings to tablet surfaces - the effect of some direct compression excipients and lubricants

Rc¹

1977

Journal of Pharmacy and Pharmacology

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“…It was the purpose of this investigation to test the assumption outlined above by a comparison of tack temperatures calculated with the aid of equation (1) with tack temperatures of the polymers determined in the usual way. 2 The comparison has been found to be satisfactory with polystyrene, poly~inylacetates~ AYAA, AYAF, AYAT, and polyisobutylenes MS and MH.…”

Section: Introductionmentioning

confidence: 84%

Adhesion. IV. The meaning of tack temperature

McLaren

Rager

et al. 1951

J. Polym. Sci.

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Heretofore it has been assumed that, under the same experimental conditions of time and magnitude of applied pressure, all amorphous polymers have equal viscosities at their tack temperatures. Further evidence is obtained with a number of polymers in support of the theory. As a nonequilibrium property characterizing high polymers, tack temperature thus belongs in a category with brittle points, second‐order transition points, and softening temperatures.

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“…Young (21) reported that resin molecules were inclined at an angle depending upon the number and distribution of the polar groups along the molecule. (10) found an increase in adhesion with increasing amounts of maleic acid when they tested the adhesion of vinyl chloridevinyl acetate-maleic acid copolymers to cellulose films. Harvey and McNesby (9) reported from adsorption studies that a generally greater attraction for the metal was indicated on increasing chain length of a hydrocarbon, on introducing double bonds or a halogen atom into the molecule, or, especially, on introducing a hydroxyl group.…”

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confidence: 99%