Polymer science melting temperature

FIGURE 10-39 Melting curves of volume versus temperature for and CWH1W (plotted from the data of L. Mandelkem, Comprehensive Polymer Science, Vol 2. Pergamon Press, Oxford, 1989). 

At present new directions in modification are being developed using ultradispersed powders-fluorenes, being closed molecules, Cn, where n=60, 70, 80... They have crystalline structure and melt at the temperature above 237 °C, but still technology of their production is complex and inefficient [288]. Over the last years chemistry of polymers with conjugated system (PCS) developed into separate field of polymer science [289]. 

Figure 5.10 Time dependence of the integrated intensity estimated for the infrared bands characteristic of the partially disordered trans-form (1368cm ) and the regular trans-zigzag form (728 cm ) in the isothermal crystallization process from the melt. The time 0 s was defined as the time when the temperature reached just the predetermined crystallization point (Tc). (From Reference 44 with permission from the Society of Polymer Science, Japan.)...

Van de Velde, K., Kiekens, P., 2002. Polymer Testing 21, pp. 433—442 the melting temperature data is from Sigma-Aldrich at. http //www.sigmaaldrich.com/materials-science/polymer-science/resomer.html. 

Pressure-volume-temperature (P-V-T) investigations represent an underappreciated area of polymer science and engineering. Such data can be obtained for both polymer solids and melts, sometimes in a single experiment (see the next section). Needless to say, such experiments can be conducted also for materials other than polymeric. The main applications of P-V-T results in the field of polymers are ... 

Fig. 4.5. Melting-temperature-composition relations for block copolymers of poly (ethylene terephthalate) with (1) ethylene succinate, (2) ethylene adipate, (3) diethylene adipate, (4) ethylene azelate, (5) ethylene sebacate, (6) ethylene phthalate, and (7) ethylene isophthalate. For comparative purposes data for random copolymers with ethylene adipate and with ethylene sebacate are also given. (Reproduced with permission from [16], copyright 1968, Polymer Engineering and Science.)...

Fig. 4.9. Fusion of random copolymers. The melting of polypropylenes of various stereoregularities. A plot of specific volume as a function of temperature. Curve A, ether extract, quenched curve B, pentane extract, annealed curve C, hexane fraction annealed curve D, trimethylpentane fraction annealed curve E, experimental whole polymer annealed and curve F, calculated for pure crystalline polymer. (Reproduced with permission from [19], copyright 1960, Journal of Polymer Science.)...

Shieh, Y.-T.and Liu, G.-L. (2007) Temperature-modulated differential scanning calorimetry studies on the origin of double melting peaks in isothermally melt-crystallized poly(L-lactic acid), Journal of Polymer Science Part B Polymer Physics, 45,466-474. 

Journal of Applied Polymer Science 81, No. 11, 12th Sept.2001, p.2779-85 RIGID AMORPHOUS PHASE AND LOW TEMPERATURE MELTING ENDOTHERM OF POLY(ETHYLENE TEREPHTHALATE)... 

Journal of Polymer Science Polymer Physics Edition 36, No.l, 15th Jan. 1998, p. 133-41 NEW APPROACH FOR ESTIMATING THE RECRYSTALLISATION RATE AND EQUILIBRIUM MELTING TEMPERATURE Hong Gyun Kim Robertson R E Michigan,University... 

Figure 5.2 Effect of temperature on the molten (melt)-state polycondensation process for PET [15(b)], Reprinted from Polymer, 14, Tomita, K., Polymer 14, 50 (1973), (see references) Copyright (1973), with permission from Elsevier Science...

Figure 1.67 Specific volume as a function of temperature on cooling from the melt for a polymer that tends to crystallize. Region A is liquid, B liquid with elastic response, C supercooled liquid, D glass, E crystallites in a supercooled liquid matrix, F crystallites in a glassy matrix, and G completely crystalline. Paths ABCD, ABEF, and ABG represent fast, intermediate, and very slow cooling rates, respectively. From K. M. Ralls, T. H. Courtney, and J. Wulff, Introduction to Materials Science and Engineering. Copyright 1976 by John Wiley Sons, Inc. This material is used by permission of John Wiley Sons, Inc.

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