Pressure-volume-temperature properties and free volume parameters of PEO/PMMA blends

Schmidt, Marcus; Maurer, Frans H.J.

doi:10.1002/(sici)1099-0488(19980430)36:6<1061::aid-polb14>3.0.co;2-4

Cited by 55 publications

(51 citation statements)

References 20 publications

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“…Increase in temperature above glass transition generally results in reduction of intermolecular cohesion energy and in growth of free volume. 17,139,140 In this connection, simultaneous measurement of temperature dependence of adhesion strength coupled with viscoelasticity represents a most universal tool for the QSPR investigation. This unique method holds, without exception, for any PSA and does not require knowledge of chemical composition.…”

Section: Linear Elastic and Adhesive Properties: Validity Of Dahlquismentioning

confidence: 70%

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Feldstein

Siegel

2012

J Polym Sci B Polym Phys

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Pressure‐sensitive adhesives (PSAs) are finding increasing applications in various areas of industry and medicine. PSAs are a special class of viscoelastic polymers that form strong adhesive joints with substrates of varying chemical nature under application of light external bonding pressures (1–10 Pa) over short periods of time (1–5 s). To be a PSA, a polymer should possess both high fluidity under applied bonding pressure, to form good adhesive contact, and high cohesive strength and elasticity, which are necessary for resistance to debonding stresses and for dissipation of mechanical energy at the stage of adhesive bond failure under detaching force. For rational design of novel PSAs, molecular insight into mechanisms of their adhesive behavior is necessary. As shown in this review, strength of PSA adhesive joints is controlled by a combination of diffusion, viscoelastic, and relaxation mechanisms. At the molecular level, strong adhesion is the result of a narrow balance between two generally conflicting properties: high cohesive strength and large free volume. These conflicting properties are difficult to combine in a single polymer material. Individually, high cohesive interaction energy and large free volume are necessary but insufficient prerequisites for PSA strength. Evident correlations are observed between the adhesive bond strengths of different PSAs, and their relaxation behaviors are described by longer relaxation times. Innovative PSAs with tailored properties can be produced by physical mixing of nonadhesive long‐ and short‐chain linear parent polymers, with groups at the two ends of the short chains complementary to the functional groups in the recurring units of the long chains. Although chemical composition and molecular structure of such innovative adhesives are unrelated to those of conventional PSAs, their mechanical properties and adhesive behaviors obey the same general laws, such as the Dahlquist's criterion of tack. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

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Section: Linear Elastic and Adhesive Properties: Validity Of Dahlquismentioning

confidence: 70%

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Feldstein

Siegel

2012

J Polym Sci B Polym Phys

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“…Often, van der Waals radii for the molecules in the material being studied ͑liquid, metal, polymer, etc.͒ are used as the basis for the potential. 13,19 Other molecular-based EOS models of note that have been applied to polymers are those of Dee and Walsh, 20 which is somewhat of a hybrid theory of those of Fox and Flory,21,22 Simha and Somcynsky, [16][17][18] the Flory, Orwoll, and Vrij EOS, 23 and the lattice fluid model of Sanchez and Lacombe. 16,17 The Simha-Somcynsky model is a modified lattice-hole model that defines molecular disorder of the polymer chains in terms of a hole fraction of vacant sites within a lattice.…”

Section: Introductionmentioning

confidence: 99%

A novel method for static equation-of state-development: Equation of state of a cross-linked poly(dimethylsiloxane) (PDMS) network to 10 GPa

Dattelbaum

Jensen

Schwendt

et al. 2005

The Journal of Chemical Physics

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Pressure-volume-temperature (PVT) equation-of-state (EOS) information for polymers and polymeric composites is valuable for predicting their response to extreme conditions. An obstacle in determining equations of state for polymeric materials is the lack of a simple, static experimental method for acquiring PVT data for solid networks and liquids at pressures greater than several kilobars. Here, we report a novel approach in determining static EOS for polymers using high-pressure diamond-anvil cells coupled with optical microscopy and image analysis. Results are presented for a cross-linked poly(dimethylsiloxane) polymer, Sylgard 184. Static isothermal results were fitted to empirical and semiempirical equations of state, including the Tait, Birch-Murnaghan, and Vinet forms. Static PV data were also converted to pseudoshock velocity-pseudoparticle velocity (U(s)-u(p)) for comparison to dynamic Hugoniot data. A linear Rankine-Hugoniot fit U(s)=s(T)u(p)+c(T) gives c(T)=1.572 km/s and s(T)=1.703. s(T) is related to the pressure derivative of the bulk modulus B(0) (') by s(T)=(B(0) (')+1)/4 and B(0) (')=5.8. A comparison of the static and shock data is given, along with an estimate of the Grüneisen parameter, and a discussion of the free volume content in the polymer network, and limitations of this novel method.

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“…The free volume of the polymer increases with temperature, resulting in a decrease in density. Using data from Schmidt and Mauer,46 the density was calculated to be 1169 kg/m 3 at 100°C and 1100 kg/m 3 at 200°C. M e is the molecular weight between entanglements.…”

Section: Resultsmentioning

confidence: 99%

Constrained shrinkage of highly oriented poly(methyl methacrylate) fibers

Wright

Lautenschlager

Gilbert

2004

J of Applied Polymer Sci

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Constrained shrinkage of fibers is the primary method used to examine orientation in amorphous materials. During the test, fibers are constrained, heated, and the stress that develops is measured as a function of time and temperature. This article describes an apparatus developed to measure that stress and a series of experiments for melt-spun poly(methyl methacrylate) fibers fabricated under three conditions: (1) constant viscosity, (2) increasing temperature, and (3) increasing draw velocity. Results show that both the rates of rise and the decay of the fiber shrinkage stress have an Arrhenius relationship with temperature. Fibers fabricated at a constant viscosity have the same maximum shrinkage stress and rate of stress decay. As the processing temperature decreases or as draw velocity increases, for other parameters held constant, the maximum shrinkage stress increases. The rate of stress rise increases with decreasing processing temperature or increasing draw velocity. Maximum shrinkage stress also increases with increasing molecular orientation when measured by a different test, free heat-induced shrinkage of the fibers. However, it was not possible to correlate both of these results to rubber elasticity theory attributed to the high degree of orientation present in the fibers and high polydispersity in the starting material.

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Pressure-volume-temperature properties and free volume parameters of PEO/PMMA blends

Cited by 55 publications

References 20 publications

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

Molecular and nanoscale factors governing pressure‐sensitive adhesion strength of viscoelastic polymers

A novel method for static equation-of state-development: Equation of state of a cross-linked poly(dimethylsiloxane) (PDMS) network to 10 GPa

Constrained shrinkage of highly oriented poly(methyl methacrylate) fibers

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