polyacrylic acid


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polyacrylic acid

A substance used to formulate artificial tears and supplied as eye drops for the relief of dry eye syndromes. A brand name is Viscotears.
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As listed in Table 1, the size of fibrils in the cross-section exhibited multi-order characters and increased with the increase of grafting yield, which is mainly related to the polyacrylic acid molecules as side chains grafted onto PSA molecular backbone.
The current study aims at preparation and characterization of derivatives of polyacrylic acid with some organic acids and amines through facile methods and application as thermal antioxidants for PVC as an example for the sensitive halogenated polymers.
Polyacrylic acid (PAA) and [gamma]-aminopropyltriethoxysilane were selected as the modification agent and the bridge agent, respectively.
Caption: Figure 1: Immediate scanning electron microscopy images (400x) of Hydro C (H) and Life (L) cements with (a) no treatment; (b) phosphoric acid conditioning and rinsing; (c) rinsing only; and (d) polyacrylic acid conditioning and rinsing.
Calcium phosphate Morphology Dimension ratio Crystallinity Natural Needle 5-10 nm 1.50 low bone Flaky 20-50 nm Chemical Needle 130-170 nm 1.640-1.643 high synthesis 15-25 nm Organic Needle 70-90 nm polymer 10-20 nm template Spherical 2-5 nm 1.35 low synthesis 30-50 nm 1-5 [micro]m Biological Flaky 7-8 nm template Fusiform 30-40 nm 1.5-1.66 low synthesis Flaky 6 nm 12 nm Representative Morphology Dimension method Needle 5-10 nm Flaky 20-50 nm Needle 130-170 nm Hydrothermal 15-25 nm Coprecipitation Needle 70-90 nm Polyamide 10-20 nm Polyacrylic acid Spherical 2-5 nm Polyethylene glycol 30-50 nm Polyethyleneimine 1-5 [micro]m Flaky 7-8 nm Collagen Fusiform 30-40 nm Chitosan Flaky 6 nm Chondroitin 12 nm sulfate
All chemicals, including ferric chloride hexahydrate (Fe[Cl.sub.3] x 6[H.sub.2]O), cobalt chloride (Co[Cl.sub.2]), copper (II) sulfate pentahydrate (CuS[O.sub.4]-5[H.sub.2]O), polyacrylic acid, and sodium borohydride (NaB[H.sub.4]) were analytical grade (Sinopharm Chemical Reagent Company) and were used as received without further purification.
Material Category Manufacturer Shade Ketac Fil Plus Aplicap Conventional 3M ESPE, A2 GIC Seefeld, (capsules) Germany IonoStar Molar Conventional Voco GmbH, A2 GIC Cuxhaven, (capsules) Germany Material Composition Ketac Fil Plus Aplicap Powder: codium-strontium-aluminum- lanthanum-fluorophosphosilicate glass and pigments Liquid: water, copolymer of acrylic acid-maleic acid, tartaric acid IonoStar Molar Powder: fluoroaluminosilicate glass Liquid: 25-50% polyacrylic acid, tartaric acid Material Lot number Ketac Fil Plus Aplicap 573761 IonoStar Molar 1616614 Table 2: Mean values and standard deviations of surface hardness (VHN) of the experimental groups of the study 24 h after preparation of the specimens.
Sodium lauryl sulphate (SLS), ammonium per sulfate (APS), pyrrole, acetone, sodium chloride (NaCl), polyvinyl pyrrolidone (PVP), ethanol, 2-mercaptobenzothiazole (MBT), polyacrylic acid were obtained from s.d.
The aim of the present work was to synthesis a new quaternized chitosan polyacrylic acid (QCS-PAA) nano particle and modifying textile surface using crosslinking agent and QCS-PAA nanoparticle.
Increase in the consumption of water soluble polymers for polyacrylamide, guar gum, polyvinyl alcohol, casein, gelatin and polyacrylic acid have been observed in Asia-Pacific due to continued industrialization and rise in the manufacturing sector of the region.
The Pipe and Kim research groups devised a way to strongly link long polymer chains of a plastic called polyacrylic acid (PAA) with short strands of another called polyacryloyl piperidine (PAP).
The slush experiment used sodium polyacrylate (a sodium salt of polyacrylic acid that can absorb as much as 200300 times its mass in water) as a substitute for soil.