Synthesis of Isotactic Polymers at Liquid-liquid Interfaces PDF Download
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Author: Gary Jay Fallick
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Book Description
Author: Gary Jay Fallick
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Book Description
Author: Jorge Alfert-Pérez
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
Author: Dieter A. Schlüter
Publisher: John Wiley & Sons
ISBN: 3527644083
Category : Science
Languages : en
Pages : 1229
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Book Description
Polymers are huge macromolecules composed of repeating structural units. While polymer in popular usage suggests plastic, the term actually refers to a large class of natural and synthetic materials. Due to the extraordinary range of properties accessible, polymers have come to play an essential and ubiquitous role in everyday life - from plastics and elastomers on the one hand to natural biopolymers such as DNA and proteins on the other hand. The study of polymer science begins with understanding the methods in which these materials are synthesized. Polymer synthesis is a complex procedure and can take place in a variety of ways. This book brings together the "Who is who" of polymer science to give the readers an overview of the large field of polymer synthesis. It is a one-stop reference and a must-have for all Chemists, Polymer Chemists, Chemists in Industry, and Materials Scientists.
Author: Michael I. Kinsinger
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
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Book Description
Author: Geoffrey Allen
Publisher: Pergamon
ISBN: 9780080362069
Category : Polymerization
Languages : en
Pages : 824
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Book Description
Volume 2.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 454
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Author: Massachusetts Institute of Technology
Publisher:
ISBN:
Category :
Languages : en
Pages : 1164
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Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 460
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Author: Hao Qi
Publisher:
ISBN:
Category : Crystallization
Languages : en
Pages : 356
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Book Description
Liquid-liquid and liquid-air interfaces are crucial to study amphiphile and colloidal self-assembly. Crystallization of polymers can also be regarded as a self-assembly process. In this dissertation, liquid interfaces are employed to direct polymer crystallization. Due to the particular interaction between the polymer chain and the interface, polymer crystallizations are confined in certain manners. According to the shape of the interface, this dissertation is divided into two parts, flat liquid-liquid interface and curved liquid-liquid interface. A flat water/pentyl acetate interface was created as a model system to study evaporative crystallization of poly (Îæ-caprolactone) which has carboxylic acid groups on both ends. A millimeter scale uniform polymer single crystal (PSC) film can form at the water/pentyl acetate interface. Due to the asymmetric nature of the liquid-liquid interface, the PSC film exhibit Janus property - a hydrophobic side and a hydrophilic side. Moreover, the effect of polymer chain conformation prior to on crystallization is studied, using PCL with different hydrophobic/hydrophilic ends. By using atomic force microscopy and transmission electron microscopy, terminal structures and temporal evolution of the crystalline films were explored. Different crystallization routes were revealed as a result of different polymer chain conformation. We furthermore proposed a phase diagram to explain different crystallization routes and demonstrated the phase diagram can be regulated via tuning polymer chain conformation at the liquid-liquid interface. Next, we demonstrated evaporative crystallization of PCL on a curved template will result in a curved lamella. The curved template was from PCL-b-PAA block copolymer Janus plates which can undergo a pH-triggered 2D to 3D shape transformation, due to the controlled degree of PAA ionization. As evidenced by selected area electron diffraction experiments, PCL crystalline domains arranged themselves into tortoise shell-like domain packing to accommodate the curvature. Curved space is intrinsically incommensurate with 3D translational symmetry. However, soft materials, including colloids, amphiphiles and block copolymers can form structures depicting curved surface/interfaces through self-assembly or directed assembly. It is therefore intriguing to study how polymer crystallization takes place in a curved space. Curve liquid-liquid interface was created through oil in water emulsion. Amphiphilic PLLA-b-PEG block copolymer was used as both surfactant to stabilize the emulsion and crystallization material. We demonstrated emulsion crystallization method can effectively confine and direct PLLA crystallization at curved emulsion droplet interface. Temporal evolution revealed there is only one nucleus per droplet and nucleation occurred at the interface because the crystalline block is confined at the liquid/liquid interface prior to crystallization. With the purpose to apply the obtained block copolymer crystalsomes (BCCs) for in-vivo study, we fabricated fully enclosed BCCs within 200 nm using PLLA-b-PEG/toluene and water emulsion system. Detailed structural characterization demonstrated the emulsion solution crystallization method is efficient to guide polymer chain folding into uniform crystalline packing at curved liquid-liquid interface to form single-crystal-like structure. As a new type of block copolymer ensemble, BCCs exhibit superior mechanical stability and extremely long circulation performance in vivo.
Author: Herman F. Mark
Publisher: John Wiley & Sons
ISBN: 0470073691
Category : Science
Languages : en
Pages : 1490
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Book Description
The compact, affordable reference, revised and updated The Encyclopedia of Polymer Science and Technology, Concise Third Edition provides the key information from the complete, twelve-volume Mark's Encyclopedia in an affordable, condensed format. Completely revised and updated, this user-friendly desk reference offers quick access to all areas of polymer science, including important advances in nanotechnology, imaging and analytical techniques, controlled polymer architecture, biomimetics, and more, all in one volume. Like the twelve-volume full edition, the Encyclopedia of Polymer Science and Technology, Concise Third Edition provides both SI and common units, carefully selected key references for each article, and hundreds of tables, charts, figures, and graphs.
