The glass transition temperature of a filled binder by nuclear magnetic resonance and thermal mechanical analysis

Price, E.L.; French, David M.; Tompa, Albert S.

doi:10.1002/app.1972.070160114

Cited by 19 publications

(2 citation statements)

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“…lationships with a subsequent division into real and imaginary parts. In the cited work both the models were correlated with the experimental data and with calculations by the equation of Takayanagi, and the conclusion was made that the formula (38) agrees with the experimental data best. The theory of viscoelastic properties of geterogeneous composites of the polymer-polymer type was developed on the basis of the well-know equation of Kerner A composite is described with the aid of the same Takayanagi's models which were discussed above.…”

Section: ~~O -Imentioning

confidence: 91%

“…Such position of transitions is highly probable, if one takes into consideration (see below) that in filling an expansion of the relaxation spectrum takes place, as well as a spread of the temperature interval between the beginning and end of the glass transition (which can conveniently be observed with the DTA technique (37). Separate transition temperatures associated with the existence of surface layers were observed only in a few experiments (38)(39)(40).…”

Section: ------¢ ~7mentioning

confidence: 96%

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Relaxation and viscoelastic properties of heterogeneous polymeric compositions

Lipatov

1977

Advances in Polymer Science

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Section: ~~O -Imentioning

confidence: 91%

Section: ------¢ ~7mentioning

confidence: 96%

Relaxation and viscoelastic properties of heterogeneous polymeric compositions

Lipatov

1977

Advances in Polymer Science

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The unfolding model for the representation of the mesophase layer in composites

Theocaris¹

1985

J of Applied Polymer Sci

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SynopsisThe adhesion between matrix and inclusions (fibers or particulates) in a composite material is one of principal factors characterizing the mechanical and physical behavior of the modern composite materials. All theoretical models describing these substances neglect to consider the influence of the boundary layer developed between phases during the preparation of the composite. In this paper, two versions of a theoretical model were introduced for the evaluation of this mesophase layer. It had been shown that this thin layer influences considerably the physical properties of the composite. It was assumed that the physical properties of the mesophase unfold from those of the hard-core fibers to those of the softer matrix. Thus, a multicylinder model was assumed, improving the classical two-cylinder model introduced by Hashin and Rosen for the representative volume element of the composite. Based on thermodynamic phenomena appearing at the glass transition temperatures of the composite and concerning the positions and the sizes of the heat-capacity jumps there, as well as on the experimental values of the longitudinal elastic modulus of the composite, the extent of the mesophase and the mechanical properties of the composite may be accurately evaluated. These versions of model are based on a previous one concerning a multilayer model, but they are considerably improved, in order to take into consideration, in a realistic manner, the physical phenomena developed in fiber-reinforced composites.

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Influence of silica reinforcement upon the glass transition behavior of acrylic polymers

Reid

Greenberg

1990

J of Applied Polymer Sci

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SynopsisThe glass transition temperatures (T,) of poly(acrylic acid), poly(methy1 acrylate), and poly(ethy1 acrylate) filled with submicron particulate silicas and silicates have been measured by dynamic mechanical spectroscopy and differential scanning calorimetry. The peak temperatures of the damping factor (tan6) and the dynamic shear loss modulus ( G " ) were shifted by an amount which depended upon the quantity and type of filler added to each polymer. The temperatures corresponding to the step discontinuity of specific heat also shifted, but to a lesser extent than those measured mechanically. The degree of T , shift per unit of volumetric filler addition increased with polymer pendant group polarity for both measurement methods. Utilizing a T,-crosslinking analogue, a model was developed that related positive T, shifts to polymeric segmental adsorption onto filler surfaces. This model also incorporated negative contributions to the T ' shift from energy storage mechanisms arising from particle-particle interactions, as well as corrections due to effective surface area available for polymer adsorption.

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The glass transition temperature of a filled binder by nuclear magnetic resonance and thermal mechanical analysis

Cited by 19 publications

References 20 publications

Relaxation and viscoelastic properties of heterogeneous polymeric compositions

Relaxation and viscoelastic properties of heterogeneous polymeric compositions

The unfolding model for the representation of the mesophase layer in composites

Influence of silica reinforcement upon the glass transition behavior of acrylic polymers

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