New Macroporous Crosslinked Polymer Gels Prepared via Living Radical Polymerization

2006 ◽  
Vol 947 ◽  
Author(s):  
Kazuyoshi Kanamori ◽  
Kazuki Nakanishi ◽  
Teiichi Hanada
Keyword(s):  
Phase Separation ◽  
Radical Polymerization ◽  
Polymer Gels ◽  
Living Polymerization ◽  
Living Radical Polymerization ◽  
Crosslinked Polymer ◽  
Type Phase ◽  
Mechanical Durability

ABSTRACTMacroporous crosslinked polymer gels have been prepared via TEMPO-mediated living radical polymerization of divinylbenzene (DVB) in a solvent with a counter polymer. Incorporating a counter polymer, poly(dimethylsiloxane) (PDMS), induced macroscopic spinodal-type phase separation during the course of polymerization of DVB while suppressing the segregation of DVB-derived particles from the solution by living polymerization. Well-defined macroporous morphologies comprising continuous DVB-derived skeletons have thus obtained. Macropore volume and diameter were independently controlled by altering the concentrations of PDMS and the solvent. Since the present polymer gels are prepared using only the multifunctional “crosslinker”, mechanical durability against bending and compression was found to be as high as inorganic ceramics with similar morphologies and porosities.

Preparation of Macroporous Poly(divinylbenzene) Gels via Living Radical Polymerization

2008 ◽  
Vol 1134 ◽  
Author(s):  
Joji Hasegawa ◽  
Kazuyoshi Kanamori ◽  
Kazuki Nakanishi ◽  
Teiichi Hanada ◽  
Shigeru Yamago
Keyword(s):  
Phase Separation ◽  
Radical Polymerization ◽  
Spinodal Decomposition ◽  
Living Polymerization ◽  
Living Radical Polymerization ◽  
Polymerization Reaction ◽  
Bicontinuous Structure ◽  
Polymerization Induced Phase Separation ◽  
Micrometer Scale ◽  
Transient Structure

AbstractMacroporous cross-linked polymeric dried gels have been obtained by inducing phase separation in a homogeneous poly(divinylbenzene) (PDVB) network formed by organotellurium-mediated living radical polymerization (TERP). The living polymerization reaction of DVB with the coexistence of a non-reactive polymeric agent, poly(dimethylsiloxane) (PDMS), in solvent 1,3,5-trimethylbenzene (TMB) resulted in polymerization-induced phase separation (spinodal decomposition), and the transient structure of spinodal decomposition has been frozen by gelation. Well-defined macroporous monolithic dried gels with bicontinuous structure in the micrometer scale are obtained after removing PDMS and TMB by simple washing and drying. The properties of the macropores have been controlled by changing starting composition.

Precise synthesis of poly(N-acryloyl amino acid) through photoinduced living polymerization

2018 ◽  
Vol 9 (20) ◽  
pp. 2733-2745 ◽  
Author(s):  
Guofeng Li ◽  
Wenli Feng ◽  
Nathaniel Corrigan ◽  
Cyrille Boyer ◽  
Xing Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
Radical Polymerization ◽  
Living Polymerization ◽  
Living Radical Polymerization ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

A library of N-acryloylamino acid polymers with controlled molecular weights and narrow molecular weight distributions (Mw/Mn < 1.20) was created by a universal and versatile photoinduced living radical polymerization technique.

Freeze-etch TEM of aqueous polymer gel network morphology

1986 ◽  
Vol 44 ◽  
pp. 796-797
Author(s):  
J. A. N. Zasadzinski ◽  
R. K. Prud'homme
Keyword(s):  
Metal Ion ◽  
Polymer Network ◽  
Polymer Gels ◽  
Polymer Gel ◽  
Deformation History ◽  
Crosslinked Polymer ◽  
Aqueous Polymer ◽  
History Of ◽  
Gel Network ◽  
Network Morphology

The rheological and mechanical properties of crosslinked polymer gels arise from the structure of the gel network. In turn, the structure of the gel network results from: thermodynamically determined interactions between the polymer chain segments, the interactions of the crosslinking metal ion with the polymer, and the deformation history of the network. Interpretations of mechanical and rheological measurements on polymer gels invariably begin with a conceptual model of,the microstructure of the gel network derived from polymer kinetic theory. In the present work, we use freeze-etch replication TEM to image the polymer network morphology of titanium crosslinked hydroxypropyl guars in an attempt to directly relate macroscopic phenomena with network structure.

scholarly journals One-pot synthesis for gradient copolymers via concurrent tandem living radical polymerization: mild and selective transesterification of methyl acrylate through Al(acac)3 with common alcohols

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26049-26055
Author(s):  
Tam Thi-Thanh Huynh ◽  
Si Eun Kim ◽  
Soon Cheon Kim ◽  
Jin Chul Kim ◽  
Young Il Park ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Methyl Acrylate ◽  
Living Radical Polymerization ◽  
One Pot ◽  
Gradient Copolymers ◽  
One Pot Synthesis

The acrylate based gradient copolymers were successfully synthesized by concurrent tandem living radical polymerization using Al(acac)3 as cocatalyst with common alcohols.

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