Aerylie acid

Also, membranes from blends of PVA/Poly(aerylie acid) [PAcr.Ac.] show a selective permeability against different components of a liquid mixture. This property of membranes makes them useful for the separation of components from liquid mixtures by the pervaporation method, i.e., for methanol dehydration. 

Furyl-(3-aerylie Acid (Furfuralacetic Acid or Furacetic Acid), O.CH CH.CH C.CH CH.CO,i,H mw 138.12. Exists as stable and labile isomers. The stable form ndls(w), mp 141°, bp (with quick heating) 255—65°(286°) sol in ale, eth, benz, HAc hot w steam distils. Can be prepd by refluxing furfural with NaAc (Refs 1, 2 4). The labile form prisms plates (benz), mp 103—04° sol in benz hot w. Was prepd by refluxing furfuridine malonic acid with Ac20 and recrystn as its piperidine salt from benz (the salt of the stable form is more sol in benz (Ref 3)... 

By using this reaction, copolymers of acrylic add and N-p-(methaeryloyloxy)ethyl derivative of uracil or thymine, and also those of methacrylic add and the methacrylate of pyrimidine bases are successfully prepared. The molecular weights of poly-(aerylie acid) and poly(methacrylic acid) used here were about 15,(WO. 

Arndt K-F, Richter A, Ludwig S, Zimmermann J, Kressler J, Kuckling D, Adler H-J (1999) Poly (vinyl alcohol)/poly(aerylie acid) hydrogels FT-IR spectroscopic characterization of cross-linking reaction and work at transition point. Acta Polym 50 383-390 Arndt K-F, Kuckling D, Richter A (2000) Application of sensitive hydrogels in flow control. Polym Adv Technol 11 496-505... 

Scheme 1. Homogeneous hydrogenation of the aerylie acid derivate 3 to give (S)-naproxene (4).

Polyethylene (PE) Aerylie acid (AA) RF diseharge (13.6 MHz), 6.6 Pa, 30-70 W, 5 0 min Adhesion enhancement to epoxy matrix. Hydrophilization initial contact angle 0 = 65°, final contact angle 0 = 8°... 

In Table 3, experimental values of were estimated from swelling measurements and shear modulus at 10 seconds. The data confirm the difference between divinylbenzene and aerylie acid anhydride. When DVB is used as the crosslinker, the experimental values agree well with the theoretical ones. The close agreement may be fortuitous however, since one would expect physical crosslinks to contribute to the experimentally measured crosslink level, especially when modulus was used. Apparently, network defects and physical crosslinks nearly cancel each other out in this system. 

As the water-absorbing polymer for the absorption sheet, poly-(aerylie acid) is often used. In order to keep the total cost of foodpackaging material low, a mass-produced expensive polymer is preferred. 

Figure 19.4 Morphological transformation on the PF-b-PAA diblock copolymers by varying the coil fraction and solvent selectivity. (Reproduced with permission from Y.-C. Tung, W.-C. Wu and W.-C. Chen, Morphological transformation and photophysical properties of rod-coil poly[2,7-(9,9-dihexylfluorene)]-block-poly(aerylie acid) in solution, Macromolecular Rapid Communications, 27, 1838-1844. Wiley-VCH Verlag GmbH Co. KGaA.)...

Table 3 Coexistence data (cloud points) of poly(ethylene-co-acrylic acid) (Afn/(g/mol) = 37500, Mw/(g/mol) = 183000, 3.0 wt% acrylic acid) in ethene (C2H4) and aerylie aeid (C3H4O2) at 453.15 K [1992WIN1].

---