Synthesis And Characterization Of Amphiphilic Block Copolymers Based On Polyisobutylene PDF Download

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The Synthesis and Characterization of Amphiphilic Poly(ethylene Oxide)-block-poly(octadecyl Acrylate) Block Copolymers

The Synthesis and Characterization of Amphiphilic Poly(ethylene Oxide)-block-poly(octadecyl Acrylate) Block Copolymers
Author: Yi Wang (Polymer engineer)
Publisher:
Total Pages: 0
Release: 2014
Genre: Crystalline polymers
ISBN:

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A series of well-defined poly(ethylene oxide)-block-poly(octadecyl acrylate) (PEO-b-PODA) diblock copolymers were successfully synthesized by reversible addition fragmentation transfer (RAFT) polymerization with low polydispersities (M[subscript w]/M[subscript n] = 1.09-1.13). The crystallization behavior of poly(ethylene oxide)-block-poly(octadecyl acrylate) (PEO-b-PODA) diblock copolymers has been studied by differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS) and polarized optical microscopy (POM). The melt morphology of PEO455-PODA19 experienced a transition from lamella to cylinder at 130°C. For the double crystalline block copolymer PEO455-PODA19, the micro-phase separation at 55°C created lamellar micro-domains, which confined the PEO blocks as it crystallized. The leading crystallization of PEO blocks then created a space that confined PODA crystallites as they are developed. The spherulites were formed first when PEO started to crystallize, but crystallites with polyhedral shape finally formed. As for the micelle behavior, the transmission electron microscopy (TEM) showed that amphiphilic block copolymers PEO-PODA with different volume fractions of hydrophobic PODA blocks ranging from 21% to 54%, were able to self-assemble in water forming spherical micelles.


Amphiphilic Polymer Co-networks

Amphiphilic Polymer Co-networks
Author: Costas S Patrickios
Publisher: Royal Society of Chemistry
Total Pages: 347
Release: 2020-04-23
Genre: Science
ISBN: 1839161345

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Amphiphilic polymer co-networks (APCNs) are a type of polymeric hydrogel, their hydrophobic polymer segments and hydrophilic components produce less aqueous swelling, giving better mechanical properties than conventional hydrogels. This new class of polymers is attracting increasing attention, resulting in further basic research on the system, as well as new applications. This book focuses on new developments in the field of APCNs, and is organised in four sections: synthesis, properties, applications and modelling. Co-network architectures included in the book chapters are mainly those deriving from hydrophobic macro-cross-linkers, representing the classical approach; however, more modern designs are also presented. Properties of interest discussed include aqueous swelling, thermophysical and mechanical properties, self-assembly, electrical actuation, and protein adsorption. Applications described in the book chapters include the use of co-networks as soft contact lenses, scaffolds for drug delivery and tissue engineering, matrices for heterogeneous biocatalysis, and membranes of controllable permeability. Finally, an important theory chapter on the modelling of the self-assembly of APCNs is also included. The book is suitable for graduate students and researchers interested in hydrogels, polymer networks, polymer chemistry, block copolymers, self-assembly and nanomaterials, as well as their applications in contact lenses, drug delivery, tissue engineering, membranes and biocatalysis.


Synthesis and 1H-NMR Characterization of Amphiphilic Acrylate Block Copolymers to Investigate the Effect of Chain Rigidity on Micelle Formation in Solution

Synthesis and 1H-NMR Characterization of Amphiphilic Acrylate Block Copolymers to Investigate the Effect of Chain Rigidity on Micelle Formation in Solution
Author: David Arnold
Publisher:
Total Pages: 63
Release: 2012
Genre: Copolymers
ISBN:

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Amphiphilic block copolymers are composed of distinct segments exhibiting different chemical properties. In solution, block copolymers may self-assemble to form micelles when triggered by a change in the environment. The effect of chain rigidity can be investigated in better detail if the molecular weights are controlled, as the polymer's ability to aggregate is also influenced by polymer size. Acrylate and methacrylate monomers were chosen for their similar chemical properties but their difference in reported glass transition temperature (Tg). Amphiphilic block copolymers were synthesized by a controlled free radical (RAFT) polymerization. 1H-NMR methods were developed to measure molecular weight of poly(methyl methacrylate) and poly(t-butyl acrylate) homopolymers to corroborate size-exclusion chromatography measurements. Using qualitative measurements of peak broadening that occurs by the shortening of T2 relaxation when polymers phase-separate from solution, it was found that polymers with a more rigid hydrophobic region tend to form micelles the most readily.


Block Copolymers

Block Copolymers
Author: Francisco Balta Calleja
Publisher: CRC Press
Total Pages: 604
Release: 2000-06-09
Genre: Technology & Engineering
ISBN: 9780824703820

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A summary of block copolymer chemical structures and synthesis. It discusses physical methods of characterization such as computer simulation, microhardness, dielectric spectroscopy, thermal mechanical relaxation, ultrasonic characterization, transmission electron microscopy, X-ray scattering, and NMR, among others. It also outlines rheological and processing parameters in the multiphase polymer systems with stable microstructures.