caa a22 4500 378902970 CHVBK 20180305123522.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.163 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.163 Nucleation versus melting point depression of the polycaprolactone phase in polypropylene/polycaprolactone blends [Elektronische Daten] [Vittoria Balsamo, Laura Gouveia] Polypropylene/poly(ε-caprolactone) (PP/PCL) blends were prepared by melt mixing. The thermal behaviour of the blends was investigated using differential scanning calorimetry (DSC) and dynamical rheology in the solid state (RSA). Both non-isothermal and isothermal crystallizations were performed. The Avrami equation was applied to the latter case. DSC and RSA results demonstrated in agreement with morphological observations that PP/PCL blends are immiscible in the whole composition range. PP acts as a nucleating agent for PCL, and when PP forms the disperse phase, it crystallizes in a fractionated fashion. When PCL is the disperse phase, it exhibits an unexpected melting point depression after cooling at 10 °C/min. Such depression was not observed after isothermal crystallizations, indicating that under non-isothermal crystallization kinetic problems show up. Thus, global crystallization is governed by a competition between nucleation and diffusion, which depends on crystallization conditions and composition. © 2013 by Walter de Gruyter GmbH & Co. Balsamo Vittoria Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Aptdo. 89000, Caracas 1080A, Venezuela; Fax 0058-212-9063388 aut Gouveia Laura Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Aptdo. 89000, Caracas 1080A, Venezuela; Fax 0058-212-9063388 aut e-Polymers De Gruyter 4/1(2004-12-01), 163-181 2197-4586 4:1<163 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.163 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.163 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Balsamo Vittoria Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Aptdo. 89000, Caracas 1080A, Venezuela; Fax 0058-212-9063388 aut NATIONALLICENCE 700 1- Gouveia Laura Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Aptdo. 89000, Caracas 1080A, Venezuela; Fax 0058-212-9063388 aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 163-181 2197-4586 4:1<163 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter