Sulfonation of polyglycidyl methacrylate (PGMA) chains grafted onto nonwoven polypropylene fabric is investigated in detail. Sulfonation reaction consists in implantation of sulfonate groups via epoxy ring-opening of PGMA chains grafted onto nonwoven polypropylene fabric by reaction between the GMA-grafted sample and sodium hydrogensulfite in water-dimethylformamide solution. On the basis of analyses of IR spectra of the appropriate samples and data of backward titration, two simultaneous processes are demonstrated to take place during the sulfonation reaction. These processes are the implantation of sulfonate groups via opening of the GMA epoxy rings and hydrolysis of the GMA epoxy rings with a-glycol groups formation. The main peculiarities of the sulfonation reaction in depending on the GMA grafting degree are reported.
The influence of the major grafting parameters (irradiation dose, reaction time, and inhibitor concentration) on graft polymerization of glycidyl methacrylate from its 10% solution in methanol onto nonwoven polypropylene upon irradiation with an electron accelerator in air was studied.
Portal vein thrombosis can result from the obstruction of blood flow, inflammation, and hypercoagulability of blood. Clinical symptoms include those of bowel ischemia caused by extension of the thrombus, portal hypertension, and gastrointestinal varix bleeding. Cases arising from complications of acute pancreatitis are very rare. The management of portal vein thrombosis varies, but spontaneous resolution of the thrombosis is uncommon. To prevent complications, anticoagulation therapy may be considered. We report a 51-year-old man who was treated successfully with low-molecular-weight heparin for portal vein thrombosis complicating acute necrotizing pancreatitis.
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