Gradient porosity poly(dicyclopentadiene)

Martina, Alberto Della; Hilborn, Jöns

doi:10.1557/jmr.2001.0280

Cited by 7 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, open porosity, macroporous crosslinked poly(dicyclopentadiene) (PDCPD) has been produced via chemically induced phase separation (CIPS) [1][2][3]. These materials could serve as bases for applications such as membranes, ion-exchange and chromatographic media, solid support resins, carriers, catalysts or adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Surface functionalization of cross-linked poly(dicyclopentadiene)

Martina

Garamszegi

Hilborn

2003

Reactive and Functional Polymers

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Surface functionalization of cross-linked poly(dicyclopentadiene)

Martina

Garamszegi

Hilborn

2003

Reactive and Functional Polymers

View full text Add to dashboard Cite

“…This can be explained by the higher porogen concentrations that cause gelation to occur later, thus allowing more time for the stirring to shear the polymerizing droplets. In the same manner, sample M1 not only has the lowest initial porogen concentration, but also is below the critical point, which is defined as the particular composition separating a compositions domain inside of which the porogen precipitates within a polymer matrix (low porogen concentrations) and a domain where polymer particles precipitate within the porogen (high porogen concentrations) 19, 20. In this case, gelation of the microsphere occurs even earlier since it corresponds to the gelation of the PDCPD matrix, while the gelation of the samples with porogen concentrations above the critical point corresponds to the moment where the primary particles (arising from the precipitation of PDCDP within the monomer/porogen mixture) agglomerate.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that chemically induced phase separation (CIPS) can be used to produce monolithic and gradient porosity macroporous thermosets 18–22. This technique consists of polymerizing polymer precursors in presence of an initially miscible, nonreacting porogen.…”

Section: Introductionmentioning

confidence: 99%

Macroporous poly(dicyclopentadiene) beads

Martina

Graf

Hilborn

2005

J of Applied Polymer Sci

View full text Add to dashboard Cite

Macroporous poly(dicyclopentadiene) beads have been produced via chemically induced phase separation in suspension polymerization. Phase separation is promoted by the enthalpic and entropic changes induced by the polymerization of dicyclopentadiene. By using poly(1,2-butylene glycol) monobutyl ether (M n 500 g/mol), which is not soluble in the suspending medium, as the porogen, the stabilized droplets of the monomer/porogen mixture can be considered microreactors in which both polymerization and phase separation occur, resulting in solid, biphasic microspheres. The porogen is then extracted with methanol and the particles are finally dried. The resulting macroporous crosslinked poly(dicyclopentadiene) beads are analyzed by scanning electron microscopy, mercury intrusion porosimetry, and nitrogen adsorption and are compared with similar bulk samples. Materials containing isolated pores as well as microstructures built with agglomerated particles have been produced. The porous microspheres showed micrometric average pores' access diameters and specific surface areas ranging from 1.3 to 3.1 m 2 /g.

show abstract

“…Such spatially nonuniform processes may play a role in the final physical and mechanical properties of porous polymers, which are formed through precipitation polymerization reactions in the absence of stirring. 43,57,58 This solution method is currently limited by two aspects: The first is a diffusive speed limit, which limits the speed of objects that can be tracked. Currently, this is limited to <10 μm 2 /s based on the mechanical response time of 3D-SMART.…”

Section: ■ Conclusionmentioning

confidence: 99%

Growth Kinetics of Single Polymer Particles in Solution via Active-Feedback 3D Tracking

García

Blum

et al. 2022

J. Am. Chem. Soc.

View full text Add to dashboard Cite

The ability to directly observe chemical reactions at the single-molecule and single-particle level has enabled the discovery of behaviors otherwise obscured by ensemble averaging in bulk measurements. However powerful, a common restriction of these studies to date has been the absolute requirement to surface tether or otherwise immobilize the chemical reagent/reaction of interest. This constraint arose from a fundamental limitation of conventional microscopy techniques, which could not track molecules or particles rapidly diffusing in three dimensions, as occurs in solution. However, many chemical processes occur entirely in the solution phase, leaving single-particle/-molecule analysis of this critical area of science beyond the scope of available technology. Here, we report the first kinetics studies of freely diffusing and actively growing single polymer−particles at the singleparticle level freely diffusing in solution. Active-feedback single-particle tracking was used to capture three-dimensional (3D) trajectories and real-time volumetric images of freely diffusing polymer particles (D ≈ 10 −12 m 2 /s) and extract the growth rates of individual particles in the solution phase. The observed growth rates show that the average growth rate is a poor representation of the true underlying variability in polymer−particle growth behavior. These data revealed statistically significant populations of fasterand slower-growing particles at different depths in the sample, showing emergent heterogeneity while particles are still freely diffusing in solution. These results go against the prevailing premise that chemical processes in freely diffusing solution will exhibit uniform kinetics. We anticipate that these studies will launch new directions of solution-phase, nonensemble-averaged measurements of chemical processes.

show abstract

Gradient porosity poly(dicyclopentadiene)

Cited by 7 publications

References 32 publications

Surface functionalization of cross-linked poly(dicyclopentadiene)

Surface functionalization of cross-linked poly(dicyclopentadiene)

Macroporous poly(dicyclopentadiene) beads

Growth Kinetics of Single Polymer Particles in Solution via Active-Feedback 3D Tracking

Contact Info

Product

Resources

About