Shuddhodana; Judeh, Zaher
Alginate-coating of artemisinin-loaded cochleates results in better control over gastro-intestinal release for effective oral delivery
Development of new drug delivery systems for effective delivery of poorly water-soluble drugs is important. We report the development of cochleate-based formulation for the oral administration of poorly water-soluble artemisinin (ART). Cochleates offer great potential as vehicles for the oral delivery of ART due to their high drug encapsulation and…
Hierarchical self-assembly of 3D lattices from polydisperse anisometric colloids
Luo, Binbin; Kim, Ahyoung; Smith, John W.; Ou, Zihao; Wu, Zixuan; Kim, Juyeong; Chen, Qian
Anisometric colloids—which have both nanometer and micrometer dimensions—combine features of their two constituent length scales. Here, using optical microscopy and modeling, the authors find that highly polydisperse anisometric colloids self-assemble into 3D, periodic lattices in a manner hardly inaccessible to nano- or micron-scale…
Topochemical polymerization of hierarchically ordered diacetylene monomers within the block copolymer domains
Krishnan, Deepthi; B, Amal Raj R.; Gowd, E. Bhoje
Integration of polymerizable small molecules within block copolymer based supramolecules provides a new strategy to generate functional materials. Herein we report hydrogen-bonding complexes of photopolymerizable 10,12-pentacosadyionic acid (PCDA) and polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP). We systematically investigate how annealing conditions affect the hierarchical ordering and…
A robust self-healing polyurethane elastomer: From H-bonds and stacking interactions to well-defined microphase morphology
Fan, Cheng-Jie; Huang, Zi-Chun; Li, Bei; Xiao, Wen-Xia; Zheng, En; Yang, Ke-Ke; Wang, Yu-Zhong
Self-healing materials have attracted considerable attention because of their improved safety, lifetime, energy efficiency and environmental impact. Supramolecular interactions have been extensively considered in the field of self-healing materials due to their excellent reversibility and sensitive responsiveness to environmental stimuli. However, development of a polymeric material with good…
Effects of Diisocyanate Structure and Disulfide Chain Extender on Hard Segmental Packing and Self-Healing Property of Polyurea Elastomers
Li, Ting; Zheng, Tianze; Han, Jiarui; Liu, Zhanli; Guo, Zhao-Xia; Zhuang, Zhuo; Xu, Jun; Guo, Bao-Hua
Four linear polyurea elastomers synthesized from two different diisocyanates, two different chain extenders and a common aliphatic amine-terminated polyether were used as models to investigate the effects of both diisocyanate structure and aromatic disulfide chain extender on hard segmental packing and self-healing ability. Both direct investigation on hard segments and…
A comparison of non-isocyanate and HDI-based poly(ether urethane): Structure and properties
Shen, Ziyun; Zheng, Liuchun; Li, Chuncheng; Liu, Guoming; Xiao, Yaonan; Wu, Shaohua; Liu, Jiajian; Zhang, Bo
DMC-derived poly (ether urethanes) were prepared via isocyanate-free route. The transurethanization reaction of the non-isocyanate route needs higher temperature as compared with the traditional route. There may be some unknown side reactions under high temperature which lead to changes in chemical structure and subsequent thermal and mechanical properties of the…
Light-induced healing in azobenzene bridged silsesquioxanes
Galante, María J.; Zucchi, Ileana A.; Oyanguren, Patricia A.; Sáiz, Luciana M.
Intrinsic healable polymers are materials capable of repairing itself through its chemical nature, in order to improve stability and durability and to restore the lost functionalities or properties. In this study, azobenzene (AZO) moieties were incorporated into a previously reported bridged silsesquioxane based on the reaction of isocyanatepropyltriethoxysilane (IPTS) with…
Transforming an inert nanopolymer into broad-spectrum bactericidal by superstructure tuning
Scilletta, Natalia A.; Pezzoni, Magdalena; Desimone, Martín F.; Soler-Illia, Galo J.A.A.; Catalano, Paolo N.; Bellino, Martín G.
Poloxamer block copolymers (also known as Pluronic®) are particularly useful for drug delivery and self-assembly techniques. These nanopolymers are generally considered to be biologically inert and they were used to generate only bacteria repellent surfaces but keeps bacteria alive and as a latent threat. However, the inherent capabilities of these…
Reprocessable Supramolecular Thermoplastic BAB-Type Triblock Copolymer Elastomers with Enhanced Tensile Strength and Toughness via Metal–Ligand Coordination
Wang, Wentao; Zhang, Juan; Jiang, Feng; Wang, Xuehui; Wang, Zhigang
A new strategy was proposed to enhance tensile strength, toughness, and extensibility of BAB-type reprocessable supramolecular triblock copolymer elastomers (STBCPEs) by simply incorporating 1-vinylimidazole (VI) as a minor comonomer to introduce metal–ligand coordinate bonds of minor contents into the soft matrix. Poly(n-butyl acrylate-co-1-vinylimidazole)-b-poly(isobornyl…
De-symmetrizing periodically grafted amphiphilic copolymers: design, synthesis and generation of Janus folded chains
Sarkar, Ramkrishna; Gowd, E. Bhoje; Ramakrishnan, S.
Periodically grafted amphiphilic copolymers (PGACs) were earlier shown to fold in a zigzag fashion to enable segregation of the two immiscible segments, namely the backbone and the pendant segments; crystallization of one or both segments led to the formation of a lamellar structure with the two segments located in alternate…