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Sabino, Marcos A.; Ronca, G.; Müller, Alejandro J.

doi:10.1023/a:1004831731756

Cited by 69 publications

(43 citation statements)

References 36 publications

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“…In crystallizable homopolymers usually all three different domains of self-nucleation can be defined, as has been derived for isotactic polypropylene (PP) by Fillon et al [12] and has been confirmed for other systems [13,[18][19][20] . A schematic illustration of the location of the three different self-nucleation domains is given in Figure 2.…”

Section: Classical Self-nucleation Behaviormentioning

confidence: 85%

Crystallization in ABC Triblock Copolymers with Two Different Crystalline End Blocks: Influence of Confinement on Self‐Nucleation Behavior

Schmalz

Müller

Abetz

2003

Macro Chemistry & Physics

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The influence of different confinements active during crystallization within polybutadiene‐block‐polyisoprene‐block‐poly(ethylene oxide) (PB‐b‐PI‐b‐PEO) and the corresponding hydrogenated polyethylene‐block‐poly(ethylene‐alt‐propylene)‐block‐poly(ethylene oxide) (PE‐b‐PEP‐b‐PEO) triblock copolymers on the self‐nucleation behavior of the crystallizable PEO and PE blocks is investigated by means of differential scanning calorimetry (DSC). In triblock copolymers with PEO contents ≤ 20 wt.‐% crystallization of PEO is confined within small isolated microdomains (spheres or cylinders), and PEO crystallization takes place exclusively at high supercoolings. Self‐nucleation experiments reveal an anomalous behavior in comparison to the classical self‐nucleation behavior found in semicrystalline homopolymers. In these systems, domain II (exclusive self‐nucleation domain) vanishes, and self‐nucleation can only take place at lower temperatures in domain IIISA, when annealing is already active. The self‐nucleation behavior of the PE blocks is significantly different compared with that of the PEO blocks. Regardless of the low PE content (10–25 wt.‐%) in the investigated PE‐b‐PEP‐b‐PEO triblock copolymers a classical self‐nucleation behavior is observed, i.e., all three self‐nucleation domains, usually present in crystallizable homopolymers, can be located. This is a direct result of the small segmental interaction parameter of the PEP and PE segments in the melt. As a consequence, crystallization of PE occurs without confinement from a homogeneous mixture of PE and PEP segments. Self‐nucleation regimes of a block copolymer showing confined crystallization by means of DSC.magnified imageSelf‐nucleation regimes of a block copolymer showing confined crystallization by means of DSC.

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Section: Classical Self-nucleation Behaviormentioning

confidence: 85%

Crystallization in ABC Triblock Copolymers with Two Different Crystalline End Blocks: Influence of Confinement on Self‐Nucleation Behavior

Schmalz

Müller

Abetz

2003

Macro Chemistry & Physics

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] It is already being used in some biological and medical applications, especially surgery repair materials such as sutures, bone repair devices, and drug delivery systems. [15][16][17] Like other aliphatic polyesters, however, it has a low crystallization rate and low melt strength.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal crystallization behaviour of poly(ρ-dioxanone) and poly(L-lactic acid) blends

et al. 2015

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Blends of poly(ρ-dioxanone) (PPDO) and poly(L-lactic acid) (PLLA) in different proportions were prepared by solution co-precipitation. The nonisothermal crystallization behaviour of pure PPDO and PPDO/PLLA blends was investigated by differential scanning calorimetry. The Avrami, Ozawa and Mo models were used to analyse the nonisothermal kinetics. The addition of PLLA significantly increases the crystallization peak temperature and crystallinity of PPDO, but has little effect on crystallization half-time. The activation energies of crystallization were calculated using the Kissinger equation. The results suggest that PLLA plays two roles in the nonisothermal crystallization of PPDO; PLLA both promotes the crystallization of PPDO as a nucleating agent and meanwhile restricts the motion of PPDO chains.

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“…Although many researchers have investigated the degradation behavior, spherulitic crystallization mechanism, and mechanical and thermal properties of this attractive PPDX for the medical device and pharmaceutical fields, [10][11][12][13][14][15][16][17][18][19][20] almost no detailed analysis of the crystal structure and conformation of PPDX has been reported. In this paper, we report the first preparation of lamellar crystals of PPDX grown from a dilute solution by isothermal crystallization.…”

Section: Introductionmentioning

confidence: 99%

X‐Ray and Electron Diffraction Study of Poly(p‐dioxanone)

Furuhashi

Nakayama

Monno

et al. 2004

Macromol. Rapid Commun.

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Summary: Solution‐grown lamellar crystals of poly(p‐dioxanone) (PPDX) have been crystallized isothermally from butane‐1,4‐diol at 100 °C. The crystal structure of PPDX has been determined by interpretation of X‐ray fiber diagrams of PPDX fibers and electron diffraction diagrams of lozenge‐shaped chain‐folder lamellar crystals. The unit cell of PPDX is orthorhombic with space group P212121 and parameters: a = 0.970 nm, b = 0.742 nm, and c (chain axis) = 0.682 nm. There are two chains per unit cell, which exist in an antiparallel arrangement.Transmission electron micrograph of PPDX chain‐folded lamellar crystals obtained by isothermal crystallization and its electron diffraction diagram.imageTransmission electron micrograph of PPDX chain‐folded lamellar crystals obtained by isothermal crystallization and its electron diffraction diagram.

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Untitled

Cited by 69 publications

References 36 publications

Crystallization in ABC Triblock Copolymers with Two Different Crystalline End Blocks: Influence of Confinement on Self‐Nucleation Behavior

Crystallization in ABC Triblock Copolymers with Two Different Crystalline End Blocks: Influence of Confinement on Self‐Nucleation Behavior

Nonisothermal crystallization behaviour of poly(ρ-dioxanone) and poly(L-lactic acid) blends

X‐Ray and Electron Diffraction Study of Poly(p‐dioxanone)

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