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.

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.

Biopolymer monolith for protein purification

2019 ◽  
Vol 219 ◽  
pp. 154-167 ◽  
Author(s):  
Yoshiko Miura ◽  
Hirokazu Seto ◽  
Makoto Shibuya ◽  
Yu Hoshino
Keyword(s):  
Phase Separation ◽  
Protein Purification ◽  
Protein Adsorption ◽  
Radical Polymerization ◽  
Cross Linker ◽  
Polymerization Induced Phase Separation

Porous glycopolymers, “glycomonoliths”, were prepared by radical polymerization based on polymerization-induced phase separation with an acrylamide derivative of α-mannose, acrylamide and cross-linker in order to investigate protein adsorption and separation.

scholarly journals Long-Range Surface-Directed Polymerization-Induced Phase Separation: A Computational Study

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 256
Author(s):  
Shima Ghaffari ◽  
Philip K. Chan ◽  
Mehrab Mehrvar
Keyword(s):  
Phase Separation ◽  
Long Range ◽  
Spinodal Decomposition ◽  
Surface Potential ◽  
Computational Study ◽  
Polymer Mixture ◽  
Condensation Polymerization ◽  
Wetting Layer ◽  
Polymerization Induced Phase Separation ◽  
Directed Polymerization

The presence of a surface preferably attracting one component of a polymer mixture by the long-range van der Waals surface potential while the mixture undergoes phase separation by spinodal decomposition is called long-range surface-directed spinodal decomposition (SDSD). The morphology achieved under SDSD is an enrichment layer(s) close to the wall surface and a droplet-type structure in the bulk. In the current study of the long-range surface-directed polymerization-induced phase separation, the surface-directed spinodal decomposition of a monomer–solvent mixture undergoing self-condensation polymerization was theoretically simulated. The nonlinear Cahn–Hilliard and Flory–Huggins free energy theories were applied to investigate the phase separation phenomenon. The long-range surface potential led to the formation of a wetting layer on the surface. The thickness of the wetting layer was found proportional to time t*1/5 and surface potential parameter h11/5. A larger diffusion coefficient led to the formation of smaller droplets in the bulk and a thinner depletion layer, while it did not affect the thickness of the enrichment layer close to the wall. A temperature gradient imposed in the same direction of long-range surface potential led to the formation of a stripe morphology near the wall, while imposing it in the opposite direction of surface potential led to the formation of large particles at the high-temperature side, the opposite side of the interacting wall.

Phase Separation Effect in Gelation of 3DOM Bioactive Glass

2021 ◽  
Vol 32 ◽  
pp. 15-20
Author(s):  
Reedwan Bin Zafar Auniq ◽  
Upsorn Boonyang
Keyword(s):  
Phase Separation ◽  
Bioactive Glass ◽  
Sol Gel ◽  
Hollow Spheres ◽  
Void Space ◽  
Bioactive Glasses ◽  
Pluronic P123 ◽  
Ordered Macroporous ◽  
Polymerization Induced Phase Separation ◽  
Micrometer Scale

The quaternary phase bioactive glasses (SiO2-CaO-Na2O-P2O5) were synthesized by the sol-gel process. Pluronic P123, using surfactant as structure-directing agents as well as phase separation inducers. The obtained bioactive glasses were characterized regarding morphology by using the scanning electron microscopy (SEM). Polymer colloidal crystals (CCTs) as the template component yielded either three-dimensionally ordered macroporous (3DOM) structure or hollow spheres shaped bioactive glass. The other type of morphology generation is related to the polymerization-induced phase separation (PIPS) in the gelation process. The heterogeneous precursor i.e. silica-rich regions caused the microspheres and solvent-rich areas produced micrometer-scale void space in bicontinuos structure. While the lower pH of starting precursor in 45S4P showed stronger precursor-template interactions than the 53S4P by generating the completely hollow spheres structure.

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.

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