Study of reorientational dynamics during real-time crystallization of absorbable poly(p-dioxanone) by dielectric relaxation spectroscopy

Andjelić, Saša; Fitz, Benjamin D.

doi:10.1002/1099-0488(20000915)38:18<2436::aid-polb110>3.0.co;2-l

Cited by 29 publications

(15 citation statements)

References 27 publications

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“…The microstructure of SGP has been studied in detail [14]. The morphology and crystallization behavior of PPDO and PDO/glycolide copolymers have been well studied [15][16][17][18][19]. As far as the authors are aware, no information on the thermal transition, crystallization and morphology of starch-g-aliphatic polyester copolymers has been reported.…”

Section: Introductionsupporting

confidence: 79%

Crystallization and morphology of starch-g-poly(1,4-dioxan-2-one) copolymers

Wang

Yang

Wang

et al. 2004

Polymer

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Section: Introductionsupporting

confidence: 79%

Crystallization and morphology of starch-g-poly(1,4-dioxan-2-one) copolymers

Wang

Yang

Wang

et al. 2004

Polymer

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“…In the present case for PBI, during the crystallization process no secondary a 0 -process is detected coexisting with the initial one and the evolution from the segmental dynamics for the fully amorphous sample to that of the semicrystalline specimen can be described by a single a-relaxation process. Qualitatively similar behaviour has been observed in different polymers [16,18,[20][21][22][23]. This can be understood considering that, after completion of the crystallization process the a-relaxation of the semicrystalline PBI sample is about one order of magnitude slower than the original one (Fig.…”

Section: Changes In the Segmental Dynamics Of The Amorphous Phase Indmentioning

confidence: 99%

“…DS has been used to study, in real time, the modification of the dynamics of the segments in the amorphous phase during crystallization processes [16,[19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Order and segmental mobility during polymer crystallization: Poly(butylene isophthalate)

Sanz

Nogales

Ezquerra

et al. 2006

Polymer

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The influence of the development of crystalline structure on the segmental dynamics of the amorphous phase in poly(butylene isophthalate) (PBI) has been studied by a combination of relaxation and scattering techniques. By means of dielectric spectroscopy (DS) the dynamics of both amorphous and semicrystalline PBI samples has been observed in a wide frequency and temperature range. The evolution of the crystalline phase with time has been studied in a range of temperatures, starting from initially glassy PBI by simultaneous small and wide angle X-ray scattering (SWAXS). By using a state-of-the-art setup designed specifically for the in situ study of both DS and SWAXS simultaneously (SWD), the crystallization of initially amorphous PBI has been followed in real time from both the structural and dynamics points of view. The obtained results support a model based on two different regimes on crystallization and a heterogeneous distribution of lamellar stacks. During the first regime the primary stacks cause the apparition of a rigid amorphous phase (RAP), i.e. a phase of amorphous chains lacking segmental motion. During the second regime, however, no more RAP is observed, indicating that the new lamellae that appear during this stage are nearly individual and not forming lamella stacks. q

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“…In contrary to most other dielectric experiments, which detect changes in morphology by following the so-called a-relaxation (dynamic glass transition) in time or temperature [30][31][32][33][36][37][38][39][40][41][42][43][44], we performed our experiments at high temperatures, where the dielectric signal in the frequency window of the measurement is not influenced by the a-relaxation or other local relaxations. Such experiments allow us to crystallize polymers at temperatures just below the melting point.…”

Section: Introductionmentioning

confidence: 99%