2915-52-8Relevant articles and documents
Porous polymer oil sorbents based on PET fibers with crosslinked copolymer coatings
Atta, Ayman M.,Brostow, Witold,Hagg Lobland, Haley E.,Hasan, Abdul-Raheim M.,Perez, Jose M.
, p. 25849 - 25857 (2013)
Oil sorbents - namely materials that can be used to extract oil after a spill - were fabricated from non-woven polyethylene terephthalate (NWPET) fibers modified by the adherence of crosslinked polymer coatings to the fiber surface. The NWPET fibers, which serve as a structural support for the applied functional coatings, were produced from recycled PET (polyethylene terephthalate) bottles. The oil absorbing coatings were comprised of crosslinked homopolymers and copolymers based on octadecyl acrylate (ODA), maleic anhydride (MA), and related esters of MA. The crosslinked polymer networks were synthesized by both suspension and bulk polymerization techniques using divinylbenzene (DVB) as the crosslinking agent. Efficacy of the coated NWPET fibers as oil sorbers was determined by oil absorption tests in toluene and in 10% crude oil in toluene. Rigidity, porosity and swelling of the crosslinked polymers were evaluated and correlated to the chemical structures, composition, and reaction media. Suspension polymerization yielded the desired morphology and function, providing higher porosity and in consequence a high absorption capacity.
Detection of long alkyl esters of succinic and maleic acid using TLC-MALDI-MS
Kim, Jinhee,Han, Sang-Pil,Kim, Jeongkwon,Kim, Yeong-Joon
experimental part, p. 915 - 920 (2012/01/13)
Four esters of succinic and maleic acid were synthesized, separated by thin-layer chromatography (TLC), and identified using matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS). A comparison of matrix materials showed that 2,6-dihydroxybenzoic acid (2,6-DHB) yielded a greater ionization efficiency than 2,5-DHB prior to TLC separation. The location of each ester sample on the TLC plate was estimated by comparing the developed plate with a duplicate plate that had been visualized by immersion in a KMnO 4 solution. Generally, mass spectra obtained from the KMnO4-visualized plate were relatively poor. Reproducible mass spectra with high peak abundance were difficult to obtain using the 2,6-DHB matrix from crude synthetic esters extracted from the TLC plates. Significant improvements in both reproducibility and sensitivity were realized by using pencil lead as the MALDI matrix. The current methodology will be beneficial to organic chemists since it can provide a guideline for simple and rapid characterization of small organic compounds. Copyright
Generation of quinone methide from aminomethyl(hydroxy)arenes precursors in aqueous solution
Matsumoto, Jin,Ishizu, Masayuki,Kawano, Ryu-Ichiro,Hesaka, Daisuke,Shiragami, Tsutomu,Hayashi, Yoshimi,Yamashita, Toshiaki,Yasuda, Masahide
, p. 5735 - 5740 (2007/10/03)
o-Quinone methides (QMs) are an important reactive intermediate for organic synthetic and biological standpoints of view. Photochemical and thermal transformation of N,N-dialkyl-9-aminomethyl-10-phenanthrols and their naphthalene analogs, which act as QM precursors, has been studied. These precursors readily reacted with alkyl vinyl ethers to give 2-alkoxydibenzo[f,h] chroman and 2-alkoxybenzo[f]chroman, respectively. Thermal and photochemical generation of QM was accelerated by the presence of water molecule in reaction solvents and by the formation of anionic micelle and vesicle.
