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      Crystallization and Temperature Driven Morphological Evolution of Bio-based Polyethylene Glycol-acrylic Rosin Polymer

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          Abstract

          In this work, the morphological and conformational evolution of bio-based polyethylene glycol (PEG)-acrylic rosin polymer in water was studied by scanning electron microscopy (SEM), polarized optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Rayleigh light scattering (RLS) and dynamic light scattering (DLS) techniques during a heating and cooling cycle. When the concentration was higher than the critical micelle concentration (CMC), a reversible transformation process, i.e. from micelle to irregular lamella aggregations, was detected. As the concentration was equal to or below the CMC, individual unimers aggregated into needle-shaped crystals composed of acrylic rosin crystalline core in the heating run. The crystallization of acrylic rosin blocks acted as seeds and thus, in the subsequent cooling process, the PEG corona crystallized into the cube-shaped crystals. The cytotoxicity assay showed the biocompatibility of bio-based polyethylene glycol-acrylic rosin polymer. This has great potential in the application of drug delivery and release triggered by temperature.

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          Uniform patchy and hollow rectangular platelet micelles from crystallizable polymer blends

          H. Qiu, Y. Gao, C. E. Boott … (2016)
          The preparation of colloidally stable, self-assembled materials with tailorable solid or hollow two-dimensional (2D) structures represents a major challenge. We describe the formation of uniform, monodisperse rectangular platelet micelles of controlled size by means of seeded-growth methods that involve the addition of blends of crystalline-coil block copolymers and the corresponding crystalline homopolymer to cylindrical micelle seeds. Sequential addition of different blends yields solid platelet block comicelles with concentric rectangular patches with distinct coronal chemistries. These complex nano-objects can be subject to spatially selective processing that allows their disassembly to form perforated platelets, such as well-defined hollow rectangular rings. The solid and hollow 2D micelles provide a tunable platform for further functionalization and potential for a variety of applications.
          Article 0 comments Cited 64 times – based on 0 reviews     Review now
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            Temperature-induced reversible morphological changes of polystyrene-block-poly(ethylene oxide) micelles in solution.

            Roderic Quirk, Huiming Xiong, Stephen Cheng … (2007)
            Temperature-induced reversible morphological changes of polystyrene-block-poly(ethylene oxide) micelles with degrees of polymerization of 962 for the PS and 227 for the PEO blocks (PS962-b-PEO227) in N,N-dimethylformamide (DMF)/water, in which water is a selective solvent for the PEO block, were observed. For a system with 0.2 wt % copolymer concentration and 4.5 wt % water concentration in DMF/water, the micelle morphology observed in transmission electron microscopy changed from vesicles at room temperature to worm-like cylinders and then to spheres with increasing temperature. Mixed morphologies were also formed in the intermediate temperature regions. Cooling the system back to room temperature regenerated the vesicle morphology, indicating that the morphological changes were reversible. No hysteresis was observed in the morphological changes during heating and cooling. Dynamic light scattering revealed that the hydrodynamic radius of the micelles decreased with increasing temperature. Combined static and dynamic light scattering results supported the change in morphology with temperature. The critical micellization temperatures and critical morphological transition temperatures were determined by turbidity measurements and were found to be dependent on the copolymer and water concentrations in the DMF/water system. The morphological changes were only possible if the water concentration in the DMF/water system was low, or else the mobility of the PS blocks would be severely restricted. The driving force for these morphological changes was understood to be mainly a reduction in the free energy of the corona and a minor reduction in the free energy of the interface. Morphological observations at different time periods of isothermal experiments indicated that in the pathway from one equilibrium morphology to another, large compound micelles formed as an intermediate or metastable stage.
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              Self-Assembled Polystyrene-block-poly(ethylene oxide) Micelle Morphologies in Solution

              Prachur Bhargava, Frank W Harris, Roderic Quirk … (2006)
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                Author and article information

                Journal
                Journal ID (nlm-ta): Polymers (Basel)
                Journal ID (iso-abbrev): Polymers (Basel)
                Journal ID (publisher-id): polymers
                Title: Polymers
                Publisher: MDPI
                ISSN (Electronic): 2073-4360
                Publication date (Electronic): 15 October 2019
                Publication date Collection: October 2019
                Volume: 11
                Issue: 10
                Electronic Location Identifier: 1684
                Affiliations
                [1 ]School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China; zhaoyzsense@ 123456163.com (Y.Z.); 15779418274@ 123456163.com (M.Z.); liaohuazhen06@ 123456163.com (H.L.); dufangkai501@ 123456163.com (F.D.); leifuhou@ 123456gxun.cn (F.L.); tanxc118@ 123456163.com (X.T.); zjy_03@ 123456126.com (J.Z.)
                [2 ]Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
                [3 ]Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry, Guangxi University for Nationalities, Nanning 530006, China
                Author notes
                [* ]Correspondence: huangqin@ 123456mail.gxun.cn (Q.H.); zhoujuying@ 123456126.com (J.Z.); Tel.: +86-771-326-7019 (J.Z.)
                Article
                Publisher ID: polymers-11-01684
                DOI: 10.3390/polym11101684
                PMC ID: 6835602
                PubMed ID: 31618907
                SO-VID: 14b3529f-8d20-4f2f-93ae-f5e20694d929
                Copyright © © 2019 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 20 September 2019
                Date accepted : 12 October 2019
                Categories
                Subject: Article

                Keywords: peg-acrylic rosin,crystallization,seed,morphological and conformational evolution,biocompatibility
                Data availability:
                Keywords: peg-acrylic rosin, crystallization, seed, morphological and conformational evolution, biocompatibility

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