Macroporous Polyolefin Membranes from Dicyclopentadiene High Internal Phase Emulsions: Preparation and Morphology Tuning

Abstract

The curing of 200 mm thick, surfactant-stabilized water-in-dicyclopentadiene high internal phase emulsion films by ring opening metathesis polymerization yielded 140-200 mm thick, open-cellular macroporous membranes with 81.5 AE 2% porosity. Depending on the support on which high internal phase emulsion (HIPEs) were cast, different polyHIPE membrane surface morphologies ranging from almost closed (on steel) to fully open (on glass) were obtained. At the same time, the interior morphology of the membranes was identical, featuring cavity and window diameters of 7 AE 5 and 1.4 AE 0.6 mm, respectively. The membranes were tough and ductile, as revealed by a Young's modulus of 125 AE 8 MPa and an ultimate strength at break, which occurred at 20 AE 2% elongation and 3.1 MPa. The swelling behavior of the membranes was tested in several solvents and finally the swollen membranes were functionalized by bromination, yielding still ductile membranes of 80.6 AE 1% porosity and bromide loading of 5 mmol g À1 .

All‐Dry Fabrication of Poly(methacrylic acid)‐Based Membranes with Controlled Dissolution Behavior

“…[5] For example, the performance of wound dressings can be improved by the addition of a porous polymer layer to absorb exudate [6] or to control drug release into the wound. [7] A wide variety of solution phase fabrication methods exist, including those involving phase separation mechanisms [8,9] and templating. [10,11] Increasingly, fabrication processes are moving toward solventless methods in order to lessen the environmental and economic impact associated with the use of organic solvents.…”

The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2014

“…74) [318]; (7) a tris(norbornenecarboxylate) connected to a carbon nanotube [319]; (8) bis(norbornenecarboxylate ester)s (e.g. 73) [320]; (9) 5-ethylidenenorbornene (68) [321], including its use as a part of a self-healing system [322]; (10) vinylnorbornene [323]; (11) tetracyclododecene (69) [324]; (12) norbornadienes connected to various hydrophobic groups, including a steroid system [325]; (13) dicyclopentadiene [326,327,328,329,330,331,332,333,334,335,336], including polymerizations performed in the presence zinc oxide nanoparticles [337], urea formaldehyde microcapsules [338],mildly oxidized graphene oxide [339], barium titanate [340], and high internal phase emulsions [341,342]; (14) the norbornadiene-anthracene Diels-Alder adduct (76) [343,344]; (15) norbornenedicarboxylate esters connected to cyanobiphenyl groups [345], to anthracene groups [346], and to nitroxide groups (e.g. 79) [347]; (16) the three stereoisomeric dimethyl norbornenedicarboxylates (determination of the relative rates of ROMP) [348]; …”

Properties and applications of nanoclay reinforced open‐porous polymer composites

“…High internal phase emulsion (HIPE) templated polymers (polyHIPEs) are known to have an advantage for easy preparation of monoliths, beads, and membranes, exhibiting well‐defined hierarchical open‐porous structures. HIPEs are concentrated emulsions where higher than 74 vol % of the emulsion contains the internal phase .…”