Theoretical derivation of the WLF- and annealing equations

Put, T.A.C.M. van der

doi:10.1016/j.jnoncrysol.2009.11.031

Cited by 20 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, within the glass transition region. the relevance of the free volume theory for all HPMC-AAc co-polymers is demonstrated with appropriate values of fractional free volume (0.020–0.040) and thermal expansion coefficient (1.2–9.0 × 10 −4 deg −1 ) according to experience from research in the synthetic counterparts [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

Manipulation of the Glass Transition Properties of a High-Solid System Made of Acrylic Acid-N,N′-Methylenebisacrylamide Copolymer Grafted on Hydroxypropyl Methyl Cellulose

Nassar

Whitehead

Istivan

et al. 2021

IJMS

View full text Add to dashboard Cite

Crosslinking of hydroxypropyl methyl cellulose (HPMC) and acrylic acid (AAc) was carried out at various compositions to develop a high-solid matrix with variable glass transition properties. The matrix was synthesized by the copolymerisation of two monomers, AAc and N,N′-methylenebisacrylamide (MBA) and their grafting onto HMPC. Potassium persulfate (K2S2O8) was used to initiate the free radical polymerization reaction and tetramethylethylenediamine (TEMED) to accelerate radical polymerisation. Structural properties of the network were investigated with Fourier transform infrared spectroscopy (FTIR), Xray diffraction (XRD), modulated differential scanning calorimetry (MDSC), small-deformation dynamic oscillation in-shear, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results show the formation of a cohesive macromolecular entity that is highly amorphous. There is a considerable manipulation of the rheological and calorimetric glass transition temperatures as a function of the amount of added acrylic acid, which is followed upon heating by an extensive rubbery plateau. Complementary TGA work demonstrates that the initial composition of all the HPMC-AAc networks is maintained up to 200 °C, an outcome that bodes well for applications of targeted bioactive compound delivery.

show abstract

Section: Resultsmentioning

confidence: 99%

Manipulation of the Glass Transition Properties of a High-Solid System Made of Acrylic Acid-N,N′-Methylenebisacrylamide Copolymer Grafted on Hydroxypropyl Methyl Cellulose

Nassar

Whitehead

Istivan

et al. 2021

IJMS

View full text Add to dashboard Cite

show abstract

“…due to quenching, the equation can be given in stresses, determinable from measurements of the rate behaviour. It is important to know that the same applies for glass transition as shown in reference [6]. to: ' 0 ¼ D= 0 , equal to ' ¼ D= 2 0 .…”

Section: Discussionmentioning

confidence: 97%

“…The fact that the data of Figure 3 follow the forward reaction Equation 30only, shows an always high driving stress of quenching experiments. As discussed in reference [6] for glass transition, the always high driving force can be explained as follows. On sudden cooling, the shrinkage and configurational change is confined by strong side bonds.…”

Section: Estimation Of the Nucleation Equationmentioning

confidence: 99%

A new theory of nucleation

Put

2011

Phase Transitions

Self Cite

View full text Add to dashboard Cite

The classical nucleation and growth model is modified and it is shown that the concept of fluctuations, instability and surface energy is not needed and that (as applies for glass transition) nucleation is a common example of the kinetic theory of structural change processes, with a special driving force and a special property of the activation volume parameter. This last follows from explanation of diffusion tests. This new nucleation equation leads to a new vision on heterogeneous nucleation, applicable to solids. The equation also provides, as necessary, the theoretical equation of the thus far empirical C-curves of the time-temperature-transformation diagrams (TTT-diagrams).

show abstract

“…Isotherms obtained from frequency sweep tests were shifted to a reference temperature using the time-temperature superposition principle [36,37]. Shift factor (αT) for superpositioning of isotherms can be obtained by using William-Landel-Ferry (WLF) equation and Arrhenius function [38,39] shown as Equations (1) and (2) respectively.…”

Section: Master Curvementioning

confidence: 99%

Rheology of Asphalt Binder Modified with 5W30 Viscosity Grade Waste Engine Oil

Shoukat

Yoo

2018

Applied Sciences

View full text Add to dashboard Cite

The pavement structure tends to shrink under low temperature conditions and cracks will appear upon crossing threshold binder stiffness. Decreasing the binder viscosity at such low temperatures, by introducing additional oil fraction (aromatics and saturates) in asphalt colloidal systems, may result in improved resistance to thermal cracking. A single multi-grade engine oil (5W30) was used in this study to analyze the rheological properties imparted to binders. Rotational Viscosity (RV) test revealed that after Rolling Thin Film Oven (RTFO) aging, fresh oil and waste oil have a similar effect on decreasing the viscosity of binder and construction temperatures, reducing them by 5~8 °C. Fourier Transform Infrared Spectroscopy (FTIR) test results showed an abrupt increase of carbonyl concertation when fresh engine oil was used for rejuvenation while waste engine oil was less susceptible to oxidative aging. Dynamic analysis of modified binders proved that engine oil has better thermal cracking resistance but relaxation ability of binders and rutting resistance was impaired. Filtered waste engine oil resulted in a 35% decrement in the stiffness of binder compared to virgin asphalt after short term aging but upper Performance Grade (PG) was compromised by 1~3 °C with 2.5% oil inclusion. Unfiltered waste engine oil proved to have the least overall performance compared to fresh and filtered waste engine oil.

show abstract

Theoretical derivation of the WLF- and annealing equations

Cited by 20 publications

References 2 publications

Manipulation of the Glass Transition Properties of a High-Solid System Made of Acrylic Acid-N,N′-Methylenebisacrylamide Copolymer Grafted on Hydroxypropyl Methyl Cellulose

Manipulation of the Glass Transition Properties of a High-Solid System Made of Acrylic Acid-N,N′-Methylenebisacrylamide Copolymer Grafted on Hydroxypropyl Methyl Cellulose

A new theory of nucleation

Rheology of Asphalt Binder Modified with 5W30 Viscosity Grade Waste Engine Oil

Contact Info

Product

Resources

About