Study on crystalline morphology of poly(l-lactide)-poly(ethylene glycol) diblock copolymer

Sun, Jingru; Hong, Zhongkui; Yang, L.; Tang, Zhaohui; Chen, Xuesi; Jing, Xiabin

doi:10.1016/j.polymer.2004.06.026

Cited by 115 publications

(166 citation statements)

References 21 publications

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“…This makes the crystallizable block copolymers representative systems having confined crystallization behavior, especially in the strong segregation regime [52]. Confined crystallization has been widely observed in the diblock copolymers having double crystalline blocks, such as PEO-b-PCL [112][113][114][115][116], PLLA-b-PEO [117][118][119][120][121][122], PLLA-b-PCL [123][124][125], poly(p-dioxanone) (PPDX)-b-PCL [126][127][128], polyolefin-based block copolymers [129][130][131][132][133][134][135], and so on. The confined crystallization kinetics and crystalline morphology of such block copolymers have been extensively studied.…”

Section: Crystalline Morphology Of Polymer Segments Confined In Blockmentioning

confidence: 99%

“…Therefore, the orders of crystallization could be well tuned in PLLA-b-PEO copolymers by altering the crystallization conditions. Sun et al [117] have studied the crystallization behavior, structural development and morphology evolution in a series of PLLA-b-PEO diblock copolymers. PLLA-b-PEO diblock copolymers could form spherulites with banded textures and single crystals with an abundance of screw dislocations.…”

Section: Crystalline Morphology Of Polymer Segments Confined In Blockmentioning

confidence: 99%

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Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

Xie

Bao

et al. 2017

Crystals

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Due to the effects of microphase separation and physical dimensions, confinement widely exists in the multi-component polymer systems (e.g., polymer blends, copolymers) and the polymers having nanoscale dimensions, such as thin films and nanofibers. Semicrystalline polymers usually show different crystallization kinetics, crystalline structure and morphology from the bulk when they are confined in the nanoscale environments; this may dramatically influence the physical performances of the resulting materials. Therefore, investigations on the crystalline and spherulitic morphology of semicrystalline polymers in confined systems are essential from both scientific and technological viewpoints; significant progresses have been achieved in this field in recent years. In this article, we will review the recent research progresses on the crystalline and spherulitic morphology of polymers crystallized in the nanoscale confined environments. According to the types of confined systems, crystalline, spherulitic morphology and morphological evolution of semicrystalline polymers in the ultrathin films, miscible polymer blends and block copolymers will be summarized and reviewed.

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Section: Crystalline Morphology Of Polymer Segments Confined In Blockmentioning

confidence: 99%

Section: Crystalline Morphology Of Polymer Segments Confined In Blockmentioning

confidence: 99%

Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

Xie

Bao

et al. 2017

Crystals

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“…We speculated that the T c -dependent morphological behavior of the asymmetric copolymers is the result of soft confinement crystallization. It has been confirmed that the PEO-b-PLA copolymers are disordered in the melt [6,10,55]; the two components, PLA and PEO blocks, are weakly segregated. Microphase separation of the copolymers is driven by the crystallization of PLA block, which will influence the diffusion PLA component, growth and orientation of PLA lamellae.…”

Section: Soft Confined Crystallization and Microphase Separation-detementioning

confidence: 91%

“…The crystalline morphology is formed by stacking flat-on growing lamellae in the thin film. Lozenge-shaped single crystal with screw dislocation of PLA has been reported in thin film of PLA or its copolymers that the thickness is less than 100 nm [6,7,12,[55][56][57]. However, the special crystalline morphology of hexagonal dendrite stacked with PLA single crystals has never been reported.…”

Section: Dendritic Superstructures and Structure Transitions In Peo-bmentioning

confidence: 99%

“…For block copolymers that contain crystallizable components the interplay between crystallization and microphase separation somehow strongly influences the structural changes, the morphology, the properties and applications of such materials. Recently, the morphological behaviors of diblock copolymers with at least one crystallizable component have been widely investigated, especially copolymers with one or more biodegradable or/and biocompatible components [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Crystallization Behaviors and Structure Transitions of Biocompatible and Biodegradable Diblock Copolymers

Xue

Jiang

2014

Polymers

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Biocompatible and biodegradable block copolymers (BBCPs) containing crystalline blocks become increasingly important in polymer science, and have great potential applications in polymer materials. Crystallization in polymers is accompanied by the adoption of an extended conformation, or often by chain folding. It is important to distinguish between crystallization in homopolymers and in block copolymers. In homopolymers, chain folding leads to metastable structures introduced by the crystallization kinetics. In contrast, equilibrium chain folding in diblocks can be achieved as the equilibrium number of the folds is controlled by the size of the second block. The structures of BBCPs, which are determined by the competition between crystallization, microphase separation, kinetics and processing, have a tremendous influence on the final properties and applications. In this review, we present the recent advances on crystalline-crystalline diblock copolymer in our group.

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The Effect of d,l‐Lactidyl/ϵ‐Caproyl Weight Ratio and Chemical Microstructure on Surface Properties of Biodegradable Poly (d,l‐Lactide)‐co‐Poly (ϵ‐Caprolactone) Random Copolymers

et al. 2008

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Biomaterials are extensively used, developed and investigated for therapeutic and diagnostic applications, such as surgical sutures, medical devices, drug delivery systems as well as tissue engineering scaffolds. The success of a biomaterial for many of these applications is closely related to its surface or interface properties that govern several aspects of its practical performance. For example, the encapsulation efficiency and dispersion of drugs in polymers and the drug release profile from the polymer matrix can be influenced by suitably matching the surface wettability of the carrier polymer with the encapsulated drug. [1] Surface chemical enrichment, a phenomenon that generally occurs in a multi-component polymer system, may affect the degradation rate or profile for biodegradable materials. Furthermore, surface chemistry, surface physics and surface microstructure of a biomaterial are directly related to its in vitro and in vivo biological performance, such as protein adsorption and cell growth. [2][3][4][5][6][7] Synthetic aliphatic polyesters are a group of biomaterials that have gained much attention in recent years in both research and applications due to their biodegradability, biocompatibility, high-purity, and the ease to be produced on large-scale. [8,9] The most widely used and explored examples include poly (D,L-lactide) (PLA), poly (L-lactide), poly (e-caprolactone) (PCL), poly (glycolide) homopolymers and their block or random copolymers. [10][11][12][13][14][15] The versatility of chain architecture i.e. the selection of chemical components and compositions for polyester copolymers offers a variety of materials with a broad range of physical and degradation properties. [16] However, despite the abundant literature on the synthesis and characterization of polyester copolymers, [10][11][12][13][14] information on their surface properties is very limited. [17][18][19][20] Apart from the mechanical and degradation properties, surface properties of polyester copolymers are of crucial importance when selecting the most suitable material for a specific application, such as drug delivery carriers or tissue engineering scaffolds. For biomedical applications it is therefore desirable to gain insight into the dependence of surface properties on the chemical composition and type of copolymer used.On one hand, macroscopic surface properties originate from chemical surface features like the type or polarity of chemical groups on the surface. On the other hand, topographic surface features like e.g. crystalline structures on the surface are often associated with a change in surface roughness [21] and therefore may cause an enhanced friction or different protein adsorption or cell behaviour. [22] The crystallinity of such polyesters has been investigated by AFM in terms of spherulite type and size in the bulk and on the surface. It has for example been shown that for nonrandom block copolymers with the semi-crystalline PCL as one component the resulting crystallizability and morphology largely depends on th...

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Study on crystalline morphology of poly(l-lactide)-poly(ethylene glycol) diblock copolymer

Cited by 115 publications

References 21 publications

Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

Crystallization Behaviors and Structure Transitions of Biocompatible and Biodegradable Diblock Copolymers

The Effect of d,l‐Lactidyl/ϵ‐Caproyl Weight Ratio and Chemical Microstructure on Surface Properties of Biodegradable Poly (d,l‐Lactide)‐co‐Poly (ϵ‐Caprolactone) Random Copolymers

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