Poly(glycerin 1,3-dimethacrylate)-based monolith with a bicontinuous structure tailored as HPLC column by photoinitiatedin situ radical polymerization via viscoelastic phase separation

2008 ◽  
Vol 46 (14) ◽  
pp. 4651-4673 ◽  
Author(s):  
Hiroshi Aoki ◽  
Nobuo Tanaka ◽  
Takuya Kubo ◽  
Ken Hosoya
Keyword(s):  
Phase Separation ◽  
Radical Polymerization ◽  
Hplc Column ◽  
Bicontinuous Structure

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.

FEATURES OF IN SITU FORMATION OF MIXTURES OF LINEAR POLYMERS

2021 ◽  
Vol 43 (4) ◽  
pp. 280-286
Author(s):  
T.D. IGNATOVA ◽  
◽  
L.F. KOSYANCHUK ◽  
Keyword(s):  
Phase Separation ◽  
Molecular Mass ◽  
Radical Polymerization ◽  
Chemical Nature ◽  
Chain Extender ◽  
Molar Ratio ◽  
Conversion Degree ◽  
Linear Polymers ◽  
A Chain

This article is devoted to the analysis of the results of the investigation of the process of forming mixtures of linear polymers formed simultaneously in situ according to different mechanisms. The first mechanism is polyaddition, the second mechanism is radical polymerization. This is one of the possible ways to obtain multicomponent polymer systems. The kinetics of chemical reactions of the formation of components and the phase separation which accompanies these reactions were studied for mixtures of poly(methyl methacrylate) (PMMA) with two polyurethanes (PU) of different chemical nature of both flexible and rigid blocks. PU-1 was synthesized from macrodiisocyanate based on oligo(tetramethylene glycol) with molecular mass 1000 g·mol–1 and hexamethylene diisocyanate taken in the molar ratio 1 : 2 using diethylene glycol as a chain extender. PU-2 was synthesized from macrodiisocyanate based on olygo(propylene glycol) with molecular mass 1000 g·mol–1 and toluylene diisocyanate taken in the molar ratio 1 : 2 using butanediol as a chain extender. The mixture of polystyrene (PS) with PU-2 was studied too. It is established that regardless of the chemical nature of the components, the process of in situ mixture formation is subject to general laws. In particular, the change in the chemical nature of the component formed by the mechanism of polyaddition (mixtures PMMA/PU-1 and PMMA/PU-2) or of the component formed by radical polymerization (mixtures PMMA/PU-2 and PS/PU-2) does not affect the nature of the dependence of the conversion degree of components and the fraction of formed polymers at the beginning of the phase separation on the composition of the initial reaction mixtures. Only the absolute values of these parameters change due to different reactivity and different thermodynamic compatibility of the mixed components.

scholarly journals The Formation of Polyvinylidene Fluoride Membranes with Tailored Properties via Vapour/Non-Solvent Induced Phase Separation

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 71 ◽  
Author(s):  
Tiziana Marino ◽  
Francesca Russo ◽  
Alberto Figoli
Keyword(s):  
Phase Separation ◽  
Polyvinylidene Fluoride ◽  
Pore Diameter ◽  
Membrane Properties ◽  
Triethyl Phosphate ◽  
Time Intervals ◽  
Membrane Morphology ◽  
Dope Solution ◽  
Bicontinuous Structure ◽  
Preparation Techniques

The present investigation reports as it is possible to prepared polyvinylidene fluoride (PVDF) membranes for microfiltration (MF) and ultrafiltration (UF) applications, by using triethyl phosphate (TEP) as non–toxic solvent in accordance with the Green Chemistry. Casting solutions containing different concentrations of polyethylene glycol (PEG) were prepared in order to study its effect on the final membrane morphology and properties. The possibility to finely modulate membrane properties was also investigated by applying two different membrane preparation techniques, the Non-Solvent Induced Phase Separation (NIPS) and its coupling with Vapour Induced Phase Separation (VIPS). Membranes’ morphology was detected by Scanning Electron Microscopy (SEM). Thickness, porosity, contact angle, pore size and water permeability were also recorded. Both the PEG content in the dope solution and the selected time intervals during which the nascent films were exposed to established relative humidity and temperature were found to play a crucial role in membrane formation. In particular, it was demonstrated as, by varying PEG content between 10 and 20 wt %, and by setting the exposure time to humidity at 0/2.5/5/7.5 min, membranes with different pore diameter and bicontinuous structure, suitable for UF and MF applications, could be easily obtained.

scholarly journals Analysis of the Phase Separation Induced by a Free-Radical Polymerization in Solutions of Polyisobutylene in Isobornyl Methacrylate

2007 ◽  
Vol 46 (23) ◽  
pp. 7535-7542 ◽  
Author(s):  
Ezequiel R. Soulé, ◽  
Guillermo E. Eliçabe ◽  
Julio Borrajo ◽  
Roberto J. J. Williams
Keyword(s):  
Phase Separation ◽  
Free Radical ◽  
Radical Polymerization ◽  
Free Radical Polymerization

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.

Sign in / Sign up

Export Citation Format

Share Document