Journal ArticleDOI
Morphology of a highly asymmetric double crystallizable poly(ε-caprolactone-b-ethylene oxide) block copolymer
TLDR
In this article, the morphology of a double crystallizable poly(epsilon-caprolactone-b-ethylene oxide) block copolymer has been studied with in situ simultaneously small and wide-angle x-ray scattering as well as atomic force microscopy.Abstract:
The morphology of a highly asymmetric double crystallizable poly(epsilon-caprolactone-b-ethylene oxide) (PCL-b-PEO) block copolymer has been studied with in situ simultaneously small and wide-angle x-ray scattering as well as atomic force microscopy. The molecular masses Mn of the PCL and PEO blocks are 24 000 and 5800, respectively. X-ray scattering and rheological measurements indicate that no microphase separation occurs in the melt. Decreasing the temperature simultaneously triggers off a crystallization of PCL and microphase separation between the PCL and PEO blocks. Coupling and competition between microphase separation and crystallization results in a morphology of PEO spheres surrounded by PCL partially crystallized in lamella. Further decreasing temperature induces the crystallization of PEO spheres, which have a preferred orientation due to the confinements from hard PCL crystalline lamella and from soft amorphous PCL segments in different sides. The final morphology of this highly asymmetric block copolymer is similar to the granular morphology reported for syndiotactic polypropylene and other (co-) polymers. This implies a similar underlying mechanism of coupling and competition of various phase transitions, which is worth further explorationread more
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Journal ArticleDOI
Crystallization assisted self-assembly of semicrystalline block copolymers
Wei-Na He,Jun-Ting Xu +1 more
TL;DR: In this paper, the self-assembly of block copolymers (BCPs) in the presence of crystallization is reviewed, for BCPs in the bulk, thin films, single crystals and micelles.
Journal ArticleDOI
Crystallization and morphology of biodegradable or biostable single and double crystalline block copolymers
TL;DR: In this paper, a review of the literature on the crystallization and morphology of biodegradable block copolymers with at least one crystallizable component is presented, focusing on double crystalline diblock copolymer.
Journal ArticleDOI
Confined Crystallization and Morphology of Melt Segregated PLLA-b-PE and PLDA-b-PE Diblock Copolymers
Reina Verónica Castillo,Alejandro J. Müller,Ming-Champ Lin,Hsin-Lung Chen,U-Ser Jeng,Marc A. Hillmyer +5 more
TL;DR: In this paper, the crystallization behavior of strongly segregated diblock copolymers composed of polyethylene (PE) and poly(l-lactide) or racemic poly (lactides) (PLA) blocks has been investigated by differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), wideangle Xray scattering, and transmission electron microscopy (TEM).
Journal ArticleDOI
Shape Control of Soft Nanoparticles and Their Assemblies
TL;DR: This review of synthetic approaches and hierarchical strategies to manipulate the shape and morphology of nanostructures assembled from four major building units, namely block copolymers, peptide amphiphiles, proteins and nucleic acid building blocks gives special attention to anisotropic, stimuli-responsive nanoparticles that are tuned by assembly conditions.
Journal ArticleDOI
A comprehensive review on polymer single crystals—From fundamental concepts to applications
TL;DR: In this paper, a review of single crystal engineering and applications is presented, including magnetically recyclable catalyst supports, nano-hybrid shish-kebabs to mimic the natural bone nanostructures, and nano/micromotors.
References
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Book
The physics of block copolymers
TL;DR: The self consistent field theory of block copolymers has been studied in this article, where the authors describe the behavior of blockcopolymers in a variety of ways: 1. Melt Phase Behaviour of Block Copolymers 2. Block copolymer in Dilute Solution 3. Block Copylmers in Semidilute Solution 4.
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Poly(ethylene glycol) chemistry : biotechnical and biomedical applications
TL;DR: PEG Derivatized Ligands with Hydrophobic and Immunological Specificity and Preparation and Properties of Monomethoxypoly(Ethylene Glycol)Modified Enzymes for Therapeutic Applications.
Journal ArticleDOI
Enhancement of Protein Crystal Nucleation by Critical Density Fluctuations
TL;DR: Because the location of the metastable critical point can be controlled by changing the composition of the solvent, the present work suggests a systematic approach to promote protein crystallization.
Book
Biodegradable polymers as drug delivery systems
Mark Chasin,Robert Langer +1 more
TL;DR: In this article, the properties, synthesis, and formulations of a number of well studied polymers increasingly being used in site-specific or systematic administration of pharmaceutical agents are reviewed and discussed.