Coassembly of Janus Nanoparticles in Asymmetric Diblock Copolymer Scaffolds: Unconventional Entropy Effect and Role of Interfacial Topology

2014 ◽  
Vol 47 (13) ◽  
pp. 4369-4379 ◽  
Author(s):  
Bojun Dong ◽  
Ruohai Guo ◽  
Li-Tang Yan
Keyword(s):  
Diblock Copolymer ◽  
Janus Nanoparticles ◽  
Entropy Effect

scholarly journals Novel Synthesis of Cellulose-Based Diblock Copolymer of Poly(hydroxyethyl methacrylate) by Mechanochemical Reaction

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Takeshi Ohura ◽  
Yusaku Tsutaki ◽  
Masato Sakaguchi
Keyword(s):  
Free Radical ◽  
Reaction Time ◽  
Diblock Copolymer ◽  
Room Temperature ◽  
Mechanochemical Reaction ◽  
Hydroxyethyl Methacrylate ◽  
Radical Chain ◽  
Mechanical Fracture ◽  
Novel Synthesis

The mechanical fracture of polymer produces polymeric free radical chain-ends, by which liner block copolymers have been synthesized. A diblock copolymer of microcrystalline cellulose (MCC) and poly 2-hydroxyethyl methacrylate (pHEMA) was produced by the mechanochemical polymerization under vacuum and room temperature. The fraction of pHEMA in MCC-block-pHEMA produced by the mechanochemical polymerization increased up to 21 mol% with increasing fracture time (~6 h). Then, the tacticities of HEMA sequences in MCC-block-pHEMA varied according to the reaction time. In the process of mechanochemical polymerization, cellulose could play the role of a radical polymerization initiator capable of controlling stereoregularity.

Effect of Additive Constraint on the Morphological and Mechanical Properties of Triblock Copolymer Blends

1996 ◽  
Vol 461 ◽  
Author(s):  
L. Kane ◽  
D. A. Norman ◽  
S. A. White ◽  
R. J. Spontak
Keyword(s):  
Electron Microscopy ◽  
Diblock Copolymer ◽  
Triblock Copolymer ◽  
Morphological Characteristics ◽  
Mechanical Analysis ◽  
Molecular Weights ◽  
Copolymer Blends ◽  
Transmission Electron ◽  
Copolymer Blend

ABSTRACTWhile numerous studies have addressed the morphological characteristics of diblock copolymer blends either with a second copolymer or a parent homopolymer, relatively few have examined comparable blends containing a triblock copolymer. In this study, we investigate the role of mid-block bridging on the morphological and physical characteristics of blends composed of a poly(styrene-b-isoprene-b-styrene) (SIS) triblock copolymer with either an unconstrained homo-polyisoprene (hI) or an end-grafted SI diblock copolymer. Blend compositions and molecular weights of the hi, as well as the I-block of the copolymer, have all been systematically varied to elucidate the effect of additive constraint on the extent of nonideal intramicrodomain mixing. Blend morphologies are characterized using transmission electron microscopy, while blend properties have been measured by dynamic mechanical analysis.

Diblock Copolymer Based Janus Nanoparticles

2015 ◽  
Vol 48 (3) ◽  
pp. 750-755 ◽  
Author(s):  
Renhua Deng ◽  
Fuxin Liang ◽  
Xiaozhong Qu ◽  
Qian Wang ◽  
Jintao Zhu ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Janus Nanoparticles

scholarly journals Preparation of Janus nanoparticles from block copolymer thin films using triazolinedione chemistry

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37048-37054 ◽  
Author(s):  
Elio Poggi ◽  
Wolfgang Ouvry ◽  
Bruno Ernould ◽  
Jean-Pierre Bourgeois ◽  
Subrata Chattopadhyay ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Block Copolymer ◽  
Click Chemistry ◽  
Diblock Copolymer ◽  
Nanostructured Thin Film ◽  
Janus Nanoparticles

A nanostructured thin film obtained from a polystyrene-block-poly(4-vinylpyridine) diblock copolymer was used as a template to produce Janus-type nanoparticles via triazolinedione-ene click chemistry.

scholarly journals Rationally designed anionic diblock copolymer worm gels are useful model systems for calcite occlusion studies

2019 ◽  
Vol 10 (37) ◽  
pp. 5131-5141 ◽  
Author(s):  
Lee A. Fielding ◽  
Coit T. Hendley IV ◽  
Emily Asenath-Smith ◽  
Lara A. Estroff ◽  
Steven P. Armes
Keyword(s):  
Binary Mixtures ◽  
Diblock Copolymer ◽  
Chain Transfer ◽  
Model Systems ◽  
Macromolecular Chain ◽  
Carboxylate Groups ◽  
Transfer Agents

Binary mixtures of RAFT macromolecular chain transfer agents are utilized to rationally design anionic diblock copolymer nanoparticles via PISA. The role of carboxylate groups in directing calcite growth within copolymer worm gels is investigated.

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