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10 pages, 9 figures.-- PACS: 64.70.Dv; 81.10.-h; 78.70.Ck; 77.22.GmThe isothermal crystallization process of poly(ether-ether-ketone) from the glass has been studied in real time by dielectric spectroscopy and x-ray scattering experiments. The combination of these two techniques revealed a complete picture of the crystallization processes from the point of view of both amorphous and crystalline phases. Analysis of results shows that the sample morphology consists of lamellar stacks, separated by rather broad amorphous regions. The lamellar stacks are highly crystalline (~70%), as obtained from both dielectric and x-ray scattering measurements, and the amorphous phase within the stacks is constrained up to a level where no segmental relaxation is possible. The remaining amorphous phase, after completion of the primary crystallization process, still has a certain mobility, but it is significantly slower than the initial amorphous mobility. Dielectric data and x-ray results are found to be highly congruent.Financial support of this work by the US–Spain Joint\udComission for Scientific and Technological Cooperation and\udby the Ministerio de Ciencia y Technología, Spain (Grant\udNos. FPA2000-0950 and BFM2000-1474) is gratefully acknowledged.\udOne of the authors (A.N.) thanks the Spanish\udMinistry of Education and Culture for a grant of the program\udFP195. Z.D. is indebted to NATO for the financial support of\udhis stay in the lab. I.S. thanks the International Cooperation\udAgency from Spain for a grant. B.H. acknowledges the financial\udsupport by NSF NO. DMR-9732653.Peer reviewe

journal of chemical physics online/the journal of chemical physics/journal of chemical physics

Molecular dynamics and microstructure development during cold crystallization in poly(ether-ether-ketone) as revealed by real time dielectric and x-ray methods