Advances in Chemistry Research, Volume 8 - download pdf or read online

By James C. Taylor

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Additional resources for Advances in Chemistry Research, Volume 8

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Chapter 2 THERMAL BHAVIOUR AND ENTHALPY RELAXATION IN AROMATIC POLYCARBONATE AND SYNDIOTACTIC POLY(METHYL-METHACRYLATE) Maurizio Penco*,1, Stefania Della Sciucca1, Gloria Spagnoli1 and Luca Di Landro2 1 Dipartimento di Chimica e Fisica per l’Ingegneria e i Materiali, University of Brescia Italy 2 Dipartimento di Aeronautica, Politecnico di Milano, Italy 1. INTRODUCTION The structural relaxation of polymers depends on the kinetic character of the glasstransition phenomenon: amorphous polymers below their Tg are not at equilibrium and their structures continuously relax in attempt to reach the equilibrium state.

4,0 ln Iqc I (K /m in) 3,0 2,0 1,0 0,0 2,182E-03 2,187E-03 2,192E-03 1/Tf (K) 2,197EE-03 2,202E-03 B Fiigure 2. 5 mg) cooled at the rates indiicated aggainst each curv ve and immediaately reheated inn the DSC. All the t cooling andd reheating scanns, cooncerning an ex xperiment, weree run on the sam me sample. Onlyy a part of the complete scans from f 137 to 3330°C are shownn here for clarityy. B) Plot of ln((cooling rate) vs reciprocal ficttive temperaturee for coooling traces sh hown in a). The full line represeents the least-sqquares fit to the data.

In this respect, a set of experiments in which the sample is cooled at different constant rates before immediately scanning in DSC is required. b such procedure is illustrated with reference to PMMA1 and PMMA5; Δh*/R is evaluated from the slope of the plot of ln[|qc|] vs [1/Tf], as shown in Figure 8, and the Δh*/R values for all the samples tested are summarized in Table 6. The lines in Figure 8 shift towards higher temperatures as the molecular mass increases (the Tg increases with molecular mass) and the value of Δh*/R continuously increases with the molecular mass of the sample as shown in Figure 9.

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