Acrylic acid factors affecting

Bednar B, Li ZM, Huang YH, Chang LCP, Morawetz H (1985) Fluorescence study of factors affecting the complexation of poly(acrylic acid) with poly(oxyethylene). Macromolecules 18 (10) 1829-1833. doi 10.1021/ma00152a007... 

Another factor which can affect the soluble fraction is the relative reactivities of acrylic acid or sodium acrylate with the crosslinkers. As evidenced by reactivity ratios of various monomer pairs, methacrylate esters tend to be more reactive with acrylic acid and acrylate esters less reactive with acrylic acid. In a crosslinking copolymerization therefore, a methacrylate crosslinker will tend to be used up earlier in the reaction than will an acrylate crosslinker. As a result, use of methacrylate crosslinkers tends to give crosslinked polyacrylates with higher extractable fraction. 

H-Thiopyrans may occasionally be isolated from the reaction of 1,5-diketones, hydrogen sulphide, and acids, although they usually disproportionate under these conditions. Dienones give 2 T-thiopyrans with the same reagents. " [4 + 2] Cycloaddition of 3-dialkylaminovinyl aryl thiones with acrylic acid derivatives and related compounds afforded the 2fT-thiopyrans (10 R = H, OEt R = CN, CONHg, COMe, etc.). The intermediate 4-dialkylamino-A -dihydrothiopyrans were sometimes isolated. Factors affecting the addition were studied, and some reactions of (10) and the derived thiopyrylium salts were described. The preparation of the azido-thiopyrans (11 R = H or Ph) by the action of sodium azide on the thiopyrylium salts has been reported. Their thermolysis afforded substituted pyridines, thiophens, and sulphur, which were the decomposition products of the expected thiazepine intermediates. 

Shojaei AH, Paulson J, Honary S. Evaluation of poly(acrylic acid-co-ethylhexyl acrylate) films for mucoadhesive transbuccal drug dehvery Factors affecting the force of mucoadhesion. / Control Release. 2000 67(2-3) 223-32. 

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