Soccio M, Nogales A, Lotti N, Munari A, Ezquerra T A
Dipartimento di Chimica Applicata e Scienza dei Materiali, Universitá di Bologna, Via Risorgimento 2, 40136 Bologna, Italy.
Phys Rev Lett. 2007 Jan 19;98(3):037801. doi: 10.1103/PhysRevLett.98.037801. Epub 2007 Jan 17.
Dielectric spectra of the polyester poly(propylene succinate) were measured upon crystallization. For this model aliphatic polyester the alpha and beta relaxations appear simultaneously and are well resolved in the experimental frequency window. During isothermal crystallization, this fact allows one to use the beta relaxation to characterize the crystalline structural development while the alpha relaxation provides information about the evolution of the amorphous phase dynamics. In this way structure development and dynamics evolution can be characterized by a single experiment during the crystallization process. The unambiguous analysis of the dielectric loss clearly supports the existence of precursors of crystallization in the induction period.
在结晶过程中测量了聚（丁二酸丙二醇酯）聚酯的介电谱。对于这种典型的脂肪族聚酯，α和β弛豫同时出现，并且在实验频率窗口中得到了很好的分辨。在等温结晶过程中，这一事实使得人们可以利用β弛豫来表征晶体结构的发展，而α弛豫则提供了有关非晶相动力学演变的信息。通过这种方式，在结晶过程中可以通过一个实验来表征结构发展和动力学演变。对介电损耗的明确分析清楚地支持了诱导期结晶前体的存在。
