Category

Self-assembled material

(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPolymer researchSAXSSelf-assembled materialTechniqueTemperature

Two-Step Chemical Transformation of Polystyrene-block-poly(solketal acrylate) Copolymers for Increasing ?

Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Rzayev, Javid; Russell, Thomas P.

We investigated the two-step chemical transformation of a series of symmetric poly(styrene-b-solketal acrylate) (PS-b-PSA) copolymers with varying molecular weights from 1900 to 27?300 g/mol (13 ? N ? 194) synthesized by sequential atom transfer radical polymerization. Through acid-catalyzed hydrolysis, the PSA block is converted into poly(glycerol acrylate) (PGA), which subsequently…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSSelf-assembled materialTechnique

Fragmentation of 1,2-Polybutadiene-block-Poly(ethylene oxide) Micelles in Imidazolium-Based Ionic Liquids

Early, Julia T.; Lodge, Timothy P.

The effect of solvent selectivity on the fragmentation kinetics of spherical micelles formed by a 1,2-polybutadiene-block-poly(ethylene oxide) “BO” copolymer in five 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide-based ionic liquids (ILs), (, where n = methyl, ethyl, butyl, hexyl, and octyl) was investigated by temperature-jump dynamic light scattering (T-jump DLS),…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPolymer researchSAXSSelf-assembled materialTechnique

Tailoring the pore size and permeability of isoporous membranes through blending with poly(ethylene glycol): Toward the balance of macro- and microphase separation

Yang, Cao-ying; Zhu, Guo-dong; Yi, Zhuan; Qiu, Ya-yu; Liu, Li-fen; Gao, Cong-jie

Isoporous membranes prepared from the combination of self-assembly and non-solvent induced phase inversion (SNIPS) were known for their asymmetric structures that were characterized with an isoporous top layer and porous/interconnected sublayer. This unique feature provides an opportunity to tailor the structure on toplayer and sublayer separately or synchronously by adjusting…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPhase analysisPolymer researchSAXSSelf-assembled materialTechniqueTemperatureWAXS

Periodic Polyethylene Sulfonates from Polyesterification: Bulk and Nanoparticle Morphologies and Ionic Conductivities

Rank, Christina; Yan, Lu; Mecking, Stefan; Winey, Karen I.

A series of polyethylene-like ionomers with periodic sulfonate groups were synthesized by polyesterification of octatetracontane-1,48-diol and tetrabutylammonium dimethyl sulfosuccinate. Optional cation exchange in aqueous dispersions replaced the NBu4+ counterions for Na+ or Cs+. The defined periodic microstructure of the polymers leads to the formation of layered structures in bulk and…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSSelf-assembled materialTechnique

Chirality Transfer in Coassembled Organogels Enabling Wide-Range Naked-Eye Enantiodifferentiation

Yue, Bingbing; Yin, Liyuan; Zhao, Wandong; Jia, Xiaoyong; Zhu, Mingjie; Wu, Bin; Wu, Si; Zhu, Liangliang

Enantiodifferentiation is crucial in organic chemistry, pharmacochemistry, material chemistry, and life science. However, it remains tremendously challenging to achieve a broad enantioselectivity to different types of chiral substrates via a single-material design. Here, we report a coassembled organogel strategy with chirality transfer to make an enantioselective generality possible. This…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSSelf-assembled materialTechnique

Towards mechanical robust yet self-healing polyurethane elastomers via combination of dynamic main chain and dangling quadruple hydrogen bonds

Hu, Jin; Mo, Ruibin; Jiang, Xiang; Sheng, Xinxin; Zhang, Xinya

One of the greatest challenges of robust self-healing materials is the confliction between high chain mobility for self-healing and a stable structure for mechanical strength. Herein, dangling 2-ureido-4-pyrimidione (UPy)-functionalized side groups were introduced into the hard segments of thermoplastic polyurethane (TPU) elastomers, where embedded the dynamic disulfide bonds in the…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSSelf-assembled materialTechnique

Effects of Hard Segment of Polyurethane with Disulfide Bonds on Shape Memory and Self-Healing Ability

Ha, Yu-Mi; Seo, Hae Cheon; Kim, Young-O; Khil, Myung-Seob; Cho, Jae Whan; Lee, Jae-Suk; Jung, Yong Chae

Self-healing polyurethane with disulfide bonds was synthesized using polycarbonate diol as a soft segment, and methylene diphenyl diisocyanate and 2-hydroxyethyl disulfide as a hard segment. Well-developed phase separation as the hard segments increased was confirmed by Fourier transform infrared spectra. The X-ray diffraction data showed that the crystallinity of the…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSelf-assembled materialTechniqueWAXS

Moebius strips of chiral block copolymers

Geng, Zhen; Xiong, Bijin; Wang, Liquan; Wang, Ke; Ren, Min; Zhang, Lianbin; Zhu, Jintao; Yang, Zhenzhong

The Moebius topology (twisted, single-sided strip) is intriguing because of its structural elegance and distinct properties. Here we report the generation of block copolymer Moebius strips via a fast self-assembly of chiral block copolymer polystyrene-block-poly(D-lactide acid) (PS-b-PDLA) in tetrahydrofuran/water mixed solvents. The Moebius strip is formed by morphological evolution from…
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsGISAXSMaterialPhase analysisPolymer researchSelf-assembled materialSurface structure and patternsTechnique

Transition Pathway between Gyroid and Cylindrical Morphology in Linear Triblock Terpolymer Thin Films

Guliyeva, Aynur; Vayer, Marylène; Warmont, Fabienne; Takano, Atsushi; Matsushita, Yushu; Sinturel, Christophe

A new transition between alternating gyroid (GA) structure and cylindrical morphology was observed in thin films for a poly(isoprene-block-styrene-block-(2-vinylpyridine)) (ISP) triblock terpolymer (I/S/P volume fraction = 0.20:0.66:0.14) exhibiting in bulk a Q214 (space group I4132) morphology. Thin films were organized using solvent vapor annealing (SVA) and characterized by atomic force…
27 January 2020
(Hydro)gels(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialNanoparticles & colloidsSAXSSelf-assembled materialShapeSizeTechnique

Solvent-non-solvent rapid-injection for preparing nanostructured materials from micelles to hydrogels

Lang, Chao; LaNasa, Jacob A.; Utomo, Nyalaliska; Xu, Yifan; Nelson, Melissa J.; Song, Woochul; Hickner, Michael A.; Colby, Ralph H.; Kumar, Manish; Hickey, Robert J.

Due to their distinctive molecular architecture, ABA triblock copolymers will undergo specific self-assembly processes into various nanostructures upon introduction into a B-block selective solvent. Although much of the focus in ABA triblock copolymer self-assembly has been on equilibrium nanostructures, little attention has been paid to the guiding principles of nanostructure…
27 January 2020