Processes for forming a permanent hydrophilic surface on a porous membrane
A technology of hydrophilic coating and basic membrane, applied in the direction of coating, membrane, membrane technology, etc., can solve the problem of increased transportation weight
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Embodiment 1
[0050] In this example, a functionalized PVA was synthesized and referred to as PVA-MMA(2.4)-high MW. PVA (20.1 g, 456 mmol, Celvol 165, purchased from Celanese Ltd.) was added to a 500 mL round bottom flask with anhydrous DMSO (175 mL) and vigorously stirred at 75 °C until a homogeneous solution was obtained. The reaction was cooled to 40 °C and 2-isocyanatoethyl methacrylate (3.53 g, 22.8 mmol) was slowly added to the vigorously stirred solution. The viscous solution was stirred for 24 hours, then cooled to room temperature. The polymer was precipitated in a 5:1 mixture of isopropanol:ether (total 800 mL). The flocculated white solid was dried under vacuum at room temperature. 1 H NMR indicated that approximately 2.4% of the repeat units contained graftable methacrylate linkages (21.5 g, 91% yield, 42% conversion). 1 H NMR (D 2 O, 400MHz) δ6.13 (1H, bs, CHH=CMe), 5.72 (1H, bs, CHH=CMe), 4.24 (2H, bm, CH 2 CH 2 ), 4.1-3.5 (43H, bm, CH of PVA), 3.45 (2H, bm, CH 2 CH 2 ...
Embodiment 2
[0051] In this example, a functionalized PVA was synthesized and referred to as PVA-MMA(5.0)-high MW. PVA (20.1 g, 456 mmol, Celvol 165, purchased from Celanese Ltd.) was added to a 500 mL three-necked round bottom flask with anhydrous DMSO (150 mL) and vigorously stirred at 95 °C until a homogeneous solution was obtained. The reaction was cooled to room temperature and 2-isocyanatoethyl methacrylate (10.1 g, 65.1 mmol) was slowly added to the vigorously stirred solution in an ice bath to control any exotherm. The viscous solution was stirred at 40 °C for 24 hours, then cooled to room temperature. The polymer was precipitated in a 3:1 mixture of isopropanol:ether (total 700 mL). The flocculated white solid was dried under vacuum at room temperature. 1 H NMR indicated that approximately 5% of the repeat units contained graftable methacrylate linkages (24.0 g, 80% yield, 39% conversion). 1 H NMR (DMSO-d 6 , 400MHz) δ6.13 (1H, bs, CHH=CMe), 5.72 (1H, bs, CHH=CMe), 4.95 (1H, b...
Embodiment 3
[0052] In this example, a functionalized PVA was synthesized and referred to as PVA-MMA(1.4)-high MW. PVA (20.0 g, 454 mmol, Celvol 165, purchased from Celanese Ltd.) was added to a 500 mL three necked round bottom flask with DMSO (200 mL) and vigorously stirred at 75 °C until a homogeneous solution was obtained. The reaction was cooled to 45 °C, and to the vigorously stirred solution were slowly added 4-(dimethylamino)pyridine (2.22 g, 18.2 mmol) and 4-isocyanatoethyl methacrylate (1.41 g, 9.09 mol) . The viscous solution was stirred for 24 hours, then cooled to room temperature. The polymer precipitated into isopropanol (total 1200 mL). The flocculated white solid was dried under vacuum at 40 °C. 1 H NMR indicated that approximately 1.4% of the repeat units contained graftable methacrylate linkages (20.8 g, 97% yield, 70% conversion). 1 H NMR (DMSO-d 6 , 400MHz) δ6.07 (1H, bs, CHH=CMe), 5.67 (1H, bs, CHH=CMe), 4.95 (1H, bm, OH of PVA), 4.67 (14H, bm, OH of PVA), 4.47 (...
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