Development of polycarbonate-containing block copolymers for thin film self-assembly applications

2016 ◽  
Vol 7 (4) ◽  
pp. 940-950 ◽  
Author(s):  
Ankit Vora ◽  
Rudy J. Wojtecki ◽  
Kristin Schmidt ◽  
Anindarupa Chunder ◽  
Joy Y. Cheng ◽  
...  
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Self Assembly ◽  
High Quality

High quality block copolymers are needed for thin film self-assembly and directed self-assembly applications.

scholarly journals Precise Synthesis and Thin Film Self-Assembly of PLLA-b-PS Bottlebrush Block Copolymers

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1412
Author(s):  
Eunkyung Ji ◽  
Cian Cummins ◽  
Guillaume Fleury
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Self Assembly ◽  
Ring Opening ◽  
Periodic Structures ◽  
One Pot ◽  
Ordered Structures ◽  
Carbonyl Chloride ◽  
Thin Film Patterning ◽  
Nanoporous Templates

The ability of bottlebrush block copolymers (BBCPs) to self-assemble into ordered large periodic structures could greatly expand the scope of photonic and membrane technologies. In this paper, we describe a two-step synthesis of poly(l-lactide)-b-polystyrene (PLLA-b-PS) BBCPs and their rapid thin-film self-assembly. PLLA chains were grown from exo-5-norbornene-2-methanol via ring-opening polymerization (ROP) of l-lactide to produce norbornene-terminated PLLA. Norbonene-terminated PS was prepared using anionic polymerization followed by a termination reaction with exo-5-norbornene-2-carbonyl chloride. PLLA-b-PS BBCPs were prepared from these two norbornenyl macromonomers by a one-pot sequential ring opening metathesis polymerization (ROMP). PLLA-b-PS BBCPs thin-films exhibited cylindrical and lamellar morphologies depending on the relative block volume fractions, with domain sizes of 46–58 nm and periodicities of 70–102 nm. Additionally, nanoporous templates were produced by the selective etching of PLLA blocks from ordered structures. The findings described in this work provide further insight into the controlled synthesis of BBCPs leading to various possible morphologies for applications requiring large periodicities. Moreover, the rapid thin film patterning strategy demonstrated (>5 min) highlights the advantages of using PLLA-b-PS BBCP materials beyond their linear BCP analogues in terms of both dimensions achievable and reduced processing time.

scholarly journals Tadpole-Shaped POSS-Based Copolymers and the Aggregation Behavior at Air/Water Interface

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Lin Zhu ◽  
Fang Chen ◽  
Xiaoyan Ma ◽  
Xiu Qiang ◽  
Zhiguang Li ◽  
...  
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Surface Pressure ◽  
Self Assembly ◽  
Aggregation Behavior ◽  
Structure Evolution ◽  
Interfacial Rheology ◽  
Water Interface ◽  
Block Sequence ◽  
Air Water Interface

The aggregation behavior of three tadpole-shaped Polyhedral oligomeric silsesquioxane (POSS) based block copolymers using different blocks poly(methyl methacrylate) (PMMA) and poly(trifluoroethyl methacrylate) (PTFEMA) with different block sequence and ratio (POSS-PTFEMA161-b-PMMA236, POSS-PMMA277-b-PTFEMA130, and POSS-PMMA466-b-PTFEMA172) was investigated on the air-water interface. The interfacial rheology of three block copolymers was studied by surface pressure isotherm, compression modulus measurements, and compression and expansion hysteresis analysis on the Langmuir trough. The block sequence and ratio play a great role in self-assembly behavior at the interface. Based on surface pressure isotherm analysis, a thin film with low elasticity was achieved for the POSS-PTFEMA161-b-PMMA236. Moreover, for the block copolymer with same segment sequence (POSS-PMMA2-b-PTFEMA), the thin film compression capability is increased with increasing the PMMA ratio. The morphology of the deposited LB thin film was illustrated by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). We observed that a thin film was composed by crater-shaped quasi-2D micelles for POSS-PTFEMA-b-PMMA, while it was proved that only flaky texture was observed for both POSS-PMMA277-b-PTFEMA130 and POSS-PMMA466-b-PTFEMA172. The thickness and area of flaky aggregates were greatly related to PMMA ratio. The different interface self-assembly structure evolution was proposed based on the interfacial rheology and thin film morphology studies.

scholarly journals Synthesis, thin-film self-assembly, and pyrolysis of ruthenium-containing polyferrocenylsilane block copolymers

2018 ◽  
Vol 9 (21) ◽  
pp. 2951-2963 ◽  
Author(s):  
Huda Nasser Al-Kharusi ◽  
Lipeng Wu ◽  
George Whittell ◽  
Robert Harniman ◽  
Ian Manners
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Block Copolymers ◽  
Self Assembly ◽  
The Self ◽  
Cylindrical Domains ◽  
Catalytic Applications

The self-assembly of a ruthenium-containing polyferrocenylsilane in bulk and thin films yielded spherical or cylindrical domains in a PS matrix; pyrolysis provided a route to bimetallic Fe/Ru NPs for potential catalytic applications.

Stimulus-Responsive Thin-Film Photonic Crystals from Rapid Self-Assembly of Block Copolymers for Photopatterning

2015 ◽  
Vol 3 (11) ◽  
pp. 1517-1523 ◽  
Author(s):  
Yeo-Wan Chiang ◽  
Jhih-Jyun Chang ◽  
Chung-Yi Chou ◽  
Cheng-Sian Wu ◽  
En-Li Lin ◽  
...  
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Photonic Crystals ◽  
Self Assembly ◽  
Stimulus Responsive

scholarly journals Synthesis and Self-Assembly of Conjugated Block Copolymers

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 110
Author(s):  
Lin-Lin Xiao ◽  
Xu Zhou ◽  
Kan Yue ◽  
Zi-Hao Guo
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Conjugated Polymers ◽  
Self Assembly ◽  
The Self ◽  
Synthetic Methods ◽  
Future Research ◽  
Structural Factors ◽  
The Past ◽  
Different Types

In the past two decades, conjugated polymers (CPs) have drawn great attention due to their excellent conductivity and charge mobility, rendering them broad applications in organic electronics. Controlling over the morphologies and nanostructures of CPs is very important to improve the performance of CP-based devices, which is still a tremendously difficult task. Conjugated block copolymers (cBCPs), composed of different CP blocks or CP coupled with coiled polymeric blocks, not only maintain the advantages of high conductivity and mobility but also demonstrate features of morphological versatility and tunability. Due to the strong π–π interaction and crystallinity of the conjugated backbones, the self-assembly behaviors of cBCPs are very complicated and largely remain to be explored. In this tutorial review, we first summarize the general synthetic methods for different types of cBCPs. Then, recent studies on the self-assembly behaviors of cBCPs are discussed, with an emphasis on the structural factors that affect the morphologies of cBCPs both in bulk and thin film states. Finally, we briefly provide our outlook on the future research of the self-assembly of cBCPs.

scholarly journals Synthesis and Thin-film Self-assembly of Cylinder-Forming High-χ Block Copolymers

2016 ◽  
Vol 29 (5) ◽  
pp. 685-688 ◽  
Author(s):  
Ankit Vora ◽  
Gabriela Alva ◽  
Anindarupa Chunder ◽  
Kristin Schmidt ◽  
Teddie Magbitang ◽  
...  
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Self Assembly

Thin Film Nanostructures Prepared via Self-Assembly of Partly Labile Protected Block Copolymers for Hybrid Patterning Strategies

2009 ◽  
Vol 42 (1) ◽  
pp. 156-163 ◽  
Author(s):  
M. Messerschmidt ◽  
M. Millaruelo ◽  
R. Choinska ◽  
D. Jehnichen ◽  
B. Voit
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Self Assembly ◽  
Thin Film Nanostructures

Self-Assembly of Hydrogels From Elastin-Mimetic Block Copolymers

2002 ◽  
Vol 724 ◽  
Author(s):  
Elizabeth R. Wright ◽  
R. Andrew McMillan ◽  
Alan Cooper ◽  
Robert P. Apkarian ◽  
Vincent P. Conticello
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Variable Temperature ◽  
Inverse Temperature ◽  
Temperature Transition ◽  
Scanning Calorimetry ◽  
Design Synthesis ◽  
Inverse Temperature Transition ◽  
Functional Biomaterials

AbstractTriblock copolymers have traditionally been synthesized with conventional organic components. However, triblock copolymers could be synthesized by the incorporation of two incompatible protein-based polymers. The polypeptides would differ in their hydrophobicity and confer unique physiochemical properties to the resultant materials. One protein-based polymer, based on a sequence of native elastin, that has been utilized in the synthesis of biomaterials is poly (Valine-Proline-Glycine-ValineGlycine) or poly(VPGVG) [1]. This polypeptide has been shown to have an inverse temperature transition that can be adjusted by non-conservative amino acid substitutions in the fourth position [2]. By combining polypeptide blocks with different inverse temperature transition values due to hydrophobicity differences, we expect to produce amphiphilic polypeptides capable of self-assembly into hydrogels. Our research examines the design, synthesis and characterization of elastin-mimetic block copolymers as functional biomaterials. The methods that are used for the characterization include variable temperature 1D and 2D High-Resolution-NMR, cryo-High Resolutions Scanning Electron Microscopy and Differential Scanning Calorimetry.

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