No abstract

Hypercrosslinked polymers (HCPs) synthesized by copolymerisation of pdichloroxylene (p-DCX) and 4-4′-bis (chloromethyl)-1-1′-biphenyl (BCMBP) constitute a family of low density porous materials with excellent textural development. Such polymers show microporosity and mesoporosity and exhibit Brunauer-Emmett-Teller (BET) surface areas of up to 1970 m 2 g-1. The CO 2 adsorption capacity of these polymers was evaluated using a thermogravimetric analyser (atmospheric pressure tests) and a high-pressure magnetic suspension balance (high pressure tests). CO 2 capture capacities were related to the textural properties of the HCPs. The performance of these materials to adsorb CO 2 at atmospheric pressure was characterized by maximum CO 2 uptakes of 1.7 mmol g-1 (7.4 wt %) at 298 K. At higher pressures (30 bar), the polymers show CO 2 uptakes of up to 13.4 mmol g-1 (59 wt %), superior to zeolite-based materials (zeolite 13X, zeolite NaX) and commercial activated carbons (BPL, Norit R). In addition, these polymers showed low isosteric heats of CO 2 adsorption and good selectivity towards CO 2. Hypercrosslinked polymers have potential to be applied as CO 2 adsorbents in pre-combustion capture processes where high CO 2 partial pressures are involved.

A series of tetrahedrally linked conjugated microporous polymer networks were prepared using a variety of bond-forming chemistries including Sonogashira-Hagihara coupling, Yamamoto coupling, thermal alkyne condensation, and "click" chemistry. These thermally stable polymers exhibit high surface areas (up to 3200 m 2 /g) and adsorb up to 2.34 wt % hydrogen by mass at 1.13 bar/77 K and 7.59 wt % carbon dioxide by mass at 1.13 bar/298 K.

Poly(aryleneethynylene) networks prepared from tetrahedral monomers are highly microporous and exhibit apparent Brunauer-Emmett-Teller surface areas of up to 1213 m2 g(-1).

500-ml flask equipped with mechanical stirrer, Dry Ice condenser, nitrogen inlet-outlet, and an addition funnel. The addition of methyl iodide to lithium was performed at ice-salt temperature in about 2 hr. After an additional 2 hr all lithium had reacted. The methyllithium solution was cooled in an acetone-Dry Ice bath and a solution of a 60:40 mixture of ethyl 2,2-dimethyl-3vinyl-and ethyl 3-ethylidene-2,2-dimethylcyclobutaneacetate (19.6 g, 0.1 mol) in anhydrous ether (25 ml) was added dropwise with rapid stirring. After addition was complete, the mixture was allowed to warm to room temperature and stirred in a nitrogen atmosphere overnight. The reaction slurry was poured onto 300 g of crushed ice containing 100 ml of concentrated ammonia. The mixture was stirred rapidly for 1 hr. The ether layer was separated and the aqueous layer was extracted with 2 X 100 ml of ether. The combined ether solutions were washed with water and dried over anhydrous sodium sulfate. Removal of ether