28393-02-4Relevant articles and documents
Design and synthesis of polydiacetylenes, and their low temperature irreversible thermochromic properties
Mergu, Naveen,Son, Young-A.
, (2020/09/17)
A thermochromic material that show irreversible color change at or below freezing temperatures has potential utility as a temperature indicator for frozen food and meat products, therefore, the goods transporters and customers would easily recognize when the goods exposed to high temperatures during their storage and delivery. In this study, we have successfully synthesized and used polydiacetylenes functionalized with glycol ester groups as a thermochromic dye, which show irreversible thermochromic behavior at below freezing temperatures. The photochromic and thermochromic properties of diacetylenes were investigated in the solid state, and color-transition temperatures for poly(DCDA-EGME), poly(DCDA-DGME) and poly(DCDA-TGME) were found to be 2, ?10 and ?16 °C, respectively. Moreover, we prepared a paper test strip and used as a warning indicator for deep freeze products.
POLYFLUORINE-SUBSTITUTED ALKYNES AND ALKADIYNOIC ACIDS II. SYNTHESIS OF ω-HYDROPOLYFLUOROALKYNES AND ALKADIYNOIC ACIDS BASED ON THEM
Radchenko, O. A.,Proshakova, E. V.,Kotlinskaya, A. N.,Il'chenko, A. Ya.
, p. 1281 - 1290 (2007/10/02)
The reaction of propargylaluminum sesquibromide with 7-monohydroperfluoroheptanal and methyl 7-monohydroperfluoroheptanoate in THF results in the formation of 1,3,3,4,10-pentahydroperfluoro-1-decyn-4-ol and 4-propargyl-1,3,3,4,10-pentahydroperfluoro-1-decyn-4-ol. 3-(Trihydroperfluoroalkoxy)-1-propynes were obtained from the alcohol-telomers and propargyl chloride.The corresponding mercury compounds, triazoles, diacetylenic alcohols, and carboxylic and hydroxamic acids were synthesized from the two types of alkynes.The acids are inhibitors of 5- and 15-lipoxygenases.
Diacetylenic Liquid Crystalline Polymers II: Derivatives of 10,12-Docosadiyne-1,22-Dioic Acid
Ozcayir, Y.,Asrar, J.,Clough, S. B.,Blumstein, A.
, p. 167 - 178 (2007/10/02)
Polymers of 10,12-docosadiyne-1,22-dioic acid with different mesogenic groups have been prepared.The mesogenic groups were diphenyl (Polymer I); p-diphenylazoxy (Polymer II); 2,2'-dimethyldiphenylazoxy (Polymer III); 2-methyldiphenylazomethine (Polymer IV) and α-methylstilbene (Polymer V).All polymers crystallized extensively at room temperature, but only polymers I and V displayed an enantiotropic smectic mesophase.The X-ray diffractograms were consistent with a smectic H mesophase for both polymers.Polymers I and V differed also from polymers II-IV by enhanced reactivity of the diacetylenic moiety.A model for chain packing consistent with the X-ray diffraction pattern of the crystalline and the smectic phase is proposed.Keywords: diacetylenic polyesters, synthesis of, liquid crystalline order
