Poly crystallization kinetics

Chuah, H. H., Crystallization Kinetics of Poly (Propylene Terephthalate), Technical Progress Report WRC-42-92, Shell Chemical Company, Houston, TX, 1992. 

Changing a heat capacity, Cp, in above-mentioned equations into the residual electrical resistivity, p, they can be reduced to the corresponding kinetics models as applied to describe the results of residual resistivity measurements [5] for LuHo.igo and LuHo.254- Experimental [5] and theoretical [7], [8] results of investigation of the short-range order relaxation in LuHq.iso and LuHo.254 poly crystals were obtained from data about measurements of residual-resistivity-time dependence and are presented in Fig. 1 (b). These results we described within the framework of the first- and second-order kinetics models as well (see Fig. 1(b)). Migration energies for LuHq.iso and LuHo.254 solid solutions were evaluated and are listed in Table 1. 

Ravindranath, K., and J.P. Jog, Polymer Crystallization Kinetics Poly(ethylene tereph-talate) and Poly(phenylene sulfide), J. Appl. Pol. Sci. 49 1395-1403 (1993). 

Vasanthakumari, R. and Pennings, A.J. (1983) Crystallization kinetics of poly(L-lactic acid). Polymer, 24,175-178. 

Pan, R, Zhu, B., Kai, W. et al. (2008) Effect of crystallization temperature on crystal modifications and crystallization kinetics of poly(L-lactide). Journal of Applied Polymer Science, 107, 54-62. 

Marega, C., Marigo, A., Di Noto, V. et al. (1992) Stiucture and crystallization kinetics of poly(L-lactic acid). Makromolekulare Chemie, 193, 1599-1606. 

Ke, T. and Sun, X. (2003) Melting behavior and crystallization kinetics of starch tmd poly(lactic add) composites. Journal of Applied Polymer Science, 89, 1203-1210. 

Xu, Y, Xu, J., Guo, B. and Xie, X. (2007) Crystallization kinetics and morphology of biodegradable poly (butylene succinate-co-propylene succinate)s. Journal of Polymer Science Part B Polymer Physics,... 

In this section experimental results are discussed, concerned with analyses of melting and crystallization kinetics, as well as reversibility of the phase transition. The frame of the discussion is set by Fig. 3.76, which will be supported by experimental data on poly(oxyethylene). The thermal analysis tools involved are TMDSC, optical and atomic-force microscopy, DSC, adiabatic calorimetry, and dilatometry. Most of these techniques are described in more detail in Chap. 4. Results from isothermal crystallization, and reorganization are attempted to be fitted to the Avrami equation. This is followed by a short remark on crystallization regimes and finally some data are presented on the polymerization and crystallization of trioxane crystals. 

The reversing heat capacity and the total heat-flow rate of an initially amorphous poly(3-hydroxybutyrate), PHB, are illustrated in Fig. 6.18 [21]. The quasi-isothermal study of the development of the crystallinity was made at 296 K, within the cold-crystallization range. The reversing specific heat capacity gives a measure of the crystallization kinetics by showing the drop of the heat capacity from the supercooled melt to the value of the solid as a function of time, while the total heat-Uow rate is a direct measure of the evolution of the latent heat of crystallization. From the heat of fusion, one expects a crystallinity of 64%, the total amount of solid material, however, when estimated from the specific heat capacity of PHB using the ATHAS Data Bank of Appendix 1, is 88%, an indication of a rigid-amorphous fraction of 24%. 

Kolstad J.J., Crystallization kinetics of poly(L-lactide-co-meso-lactide), J. Appl. Polym. Sci., 62, 1996, 1079-1091. 

Xu, W., Liand, G., Wang, W., Tang, S., He, R, and Pan, W.-P. 2003. Poly(propylene)-poly(propylene)-grafted maleic anhydride-organic montmoriUonite (PP-PP-g-MAH-Org-MMT) nanocomposites. II. Nonisothermal crystallization kinetics. 

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