Journal ArticleDOI
The glass transition behaviour and thermodynamic properties of amorphous polystyrene
Leyla Aras,M.J. Richardson +1 more
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In this paper, the effect of molecular weight and thermal history on the heat capacity of amorphous polystyrene over the temperature range from 200-440 K has been measured using differential scanning calorimetry.About:
This article is published in Polymer.The article was published on 1989-12-01. It has received 36 citations till now. The article focuses on the topics: Glass transition & Differential scanning calorimetry.read more
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Beyond water activity: recent advances based on an alternative approach to the assessment of food quality and safety
TL;DR: The effects of water, as a near-universal solvent and plasticizer, on the behavior of polymeric (as well as oligomeric and monomeric) food materials and systems, are reviewed, with emphasis on the impact of water content (in terms of increasing system mobility and eventual water "availability") on food quality, safety, stability, and technological performance.
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Enthalpy relaxation and recovery in amorphous materials
TL;DR: The field of enthalpy relaxation is reviewed in this paper, where current phenomenologies for dealing with the non-linear and non-exponential character of relaxation are presented, and their successes and shortcomings are discussed.
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The glass transition temperature versus the fictive temperature
TL;DR: A comparison of the values of the glass transition temperature (T g ) measured on cooling and the limiting temperature ðT 0f Þmeasured on heating as a function of cooling rate is performed for a polystyrene sample using both capillary dilatometry and differential scanning calorimetry (DSC) as discussed by the authors.
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THE GLASS TRANSITION TEMPERATURE OF POLYSTYRENE Results of a round robin test
TL;DR: In this article, a round robin test was performed to determine the reliability of values for the glass transition temperatureTg as determined by DTA on polymers, and the test material was high molecular weight polystyrene.
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The use of thermal methods for predicting glass-former fragility
Kieran J. Crowley,George Zografi +1 more
TL;DR: In this paper, the authors evaluated three thermal methods of fragility prediction and, using these methods, to predict the fragility of a number of pharmaceutical glass-formers using differential scanning calorimetry.
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Journal ArticleDOI
Second‐Order Transition Temperatures and Related Properties of Polystyrene. I. Influence of Molecular Weight
Thomas Fox,Paul J. Flory +1 more
TL;DR: In this article, the second-order transition temperature, viscosity-temperature coefficient, and specific volume of fractionated polystyrenes containing diethylbenzene end groups are presented over wide temperature ranges.
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Nature of the Glass Transition and the Glassy State
TL;DR: In this paper, a second-order transition is predicted for linear molecular chains, which occurs at a temperature which is an increasing function of both chain stiffness and chain length and a decreasing function of free volume.
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Dependence of the Fictive Temperature of Glass on Cooling Rate
TL;DR: In this paper, an equation derived by Ritland relating the cooling rate and fictive temperature for glasses without memory is extended to those with memory, i.e. those which exhibit a spectrum of relaxation times.
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Influence of molecular weight and degree of crosslinking on the specific volume and glass temperature of polymers
T. G. Fox,S. Loshaek +1 more
TL;DR: In this article, the specific volume-temperature-molecular weight (v-T-M) relationship for a homologous series of polymers was derived from the v-T curves for the monomer and the polymer of infinite molecular weight.