Morphological changes of isotactic poly(methyl methacrylate) thin films via self-organization and stereocomplex formation

Kamei, Daisuke; Ajiro, Hiroharu; Akashi, Mitsuru

doi:10.1038/pj.2009.324

Cited by 12 publications

(12 citation statements)

References 36 publications

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“…Moreover, the solvent effects on the incorporation of st-PMAA into it-PMMA have been investigated in detail. 231 For example, when a mixed solvent (acetonitrile/water) is used, the crystallinity of it-PMMA increases as the water content increases, 232 interactions, 65 which can be harnessed for LbL assembly. 235,236 The alkaline hydrolysis of the stereocomplex PLLA/PDLA LbL films was quantitatively investigated using QCM, 237 and it was found that the stereocomplex is more readily hydrolyzed compared to crystalline polylactic acids (PLAs).…”

Section: Stereocomplexed Lbl Assembliesmentioning

confidence: 99%

“…Moreover, the solvent effects on the incorporation of st-PMAA into it-PMMA have been investigated in detail. 231 For example, when a mixed solvent (acetonitrile/water) is used, the crystallinity of it-PMMA increases as the water content increases, 232 and this crystallization reduces the amount of st-PMAA incorporation. 233 Hollow LbL capsules (Figure 27) can be prepared with the stereocomplex (it-PMMA/st-PMMA) 10 .…”

Section: Chemical Reviewsmentioning

confidence: 99%

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Innovation in Layer-by-Layer Assembly

et al. 2016

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Methods for depositing thin films are important in generating functional materials for diverse applications in a wide variety of fields. Over the last half-century, the layer-by-layer assembly of nanoscale films has received intense and growing interest. This has been fueled by innovation in the available materials and assembly technologies, as well as the film-characterization techniques. In this Review, we explore, discuss, and detail innovation in layer-by-layer assembly in terms of past and present developments, and we highlight how these might guide future advances. A particular focus is on conventional and early developments that have only recently regained interest in the layer-by-layer assembly field. We then review unconventional assemblies and approaches that have been gaining popularity, which include inorganic/organic hybrid materials, cells and tissues, and the use of stereocomplexation, patterning, and dip-pen lithography, to name a few. A relatively recent development is the use of layer-by-layer assembly materials and techniques to assemble films in a single continuous step. We name this "quasi"-layer-by-layer assembly and discuss the impacts and innovations surrounding this approach. Finally, the application of characterization methods to monitor and evaluate layer-by-layer assembly is discussed, as innovation in this area is often overlooked but is essential for development of the field. While we intend for this Review to be easily accessible and act as a guide to researchers new to layer-by-layer assembly, we also believe it will provide insight to current researchers in the field and help guide future developments and innovation.

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Section: Stereocomplexed Lbl Assembliesmentioning

confidence: 99%

“…Moreover, the solvent effects on the incorporation of st-PMAA into it-PMMA have been investigated in detail. 231 For example, when a mixed solvent (acetonitrile/water) is used, the crystallinity of it-PMMA increases as the water content increases, 232 and this crystallization reduces the amount of st-PMAA incorporation. 233 Hollow LbL capsules (Figure 27) can be prepared with the stereocomplex (it-PMMA/st-PMMA) 10 .…”

Section: Chemical Reviewsmentioning

confidence: 99%

Innovation in Layer-by-Layer Assembly

et al. 2016

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“…As a consequence, the control of the stereoreglarity and of the molecular weight of it‐PMMA was realized by the template polymerization method using porous template films 124. We also cralified stability125–129 of the films and the polymerization mechanism using the porous it‐PMMA films in detail 130–132…”

Section: Stereocomplex Nanofilms and Their Biomedical Functionsmentioning

confidence: 99%

Layer‐by‐Layer Assembly Through Weak Interactions and Their Biomedical Applications

et al. 2011

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The surface design and control of substrates with nanometer- or micrometer-sized polymer films are of considerable interest for both fundamental and applied studies in the biomedical field because of the required surface properties. The layer-by-layer (LbL) technique was discovered in 1991 by Decher and co-workers for the fabrication of polymer multilayers constructed mainly through electrostatic interaction. The scope and applicability of this LbL assembly has been extended by introducing molecularly regular conformations of polymers or proteins by employing, for the first time, weak interactions such as van der Waals interactions and biological recognition. Since these weak interactions are the sum of the attractive or repulsive forces between parts of the same molecule, they allow macromolecules to be easily arranged into the most stable conformation in a LbL film. By applying this characteristic feature, the template polymerization of stereoregular polymers, stereoregular control of surface biological properties, drastic morphological control of biodegradable nano materials, and the development of three-dimensional cellular multilayers as a tissue model were successfully achieved. It is expected that LbL assembly using weak interactions will promote further interest into fundamental and applied studies on the design of surface chemistry in the biomedical field.

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“…25 Furthermore, stereospecific template polymerization with a radical method was used to develop porous it-PMMA films, 26−29 although the template effect was limited in solution without any substrate. 30,31 Due to such an attracting phenomenon, we recently focused on the structural analysis of the porous it-PMMA film on substrates by AFM 32,33 and transmission X-ray diffraction (XRD) analyses. However, the available information was limited to wide-angle X-ray diffraction (WAXD).…”

Section: ■ Introductionmentioning

confidence: 99%