Biobased Epoxy Matrix from Diglycidyl Ether of Bisphenol A and Epoxidized Corn Oil, Cross-Linked with Diels–Alder Adduct of Levopimaric Acid with Acrylic Acid

2013 ◽  
Vol 52 (48) ◽  
pp. 17099-17110 ◽  
Author(s):  
Fanica R. Mustata ◽  
Nita Tudorachi ◽  
Ioan Bicu
Keyword(s):  
Acrylic Acid ◽  
Bisphenol A ◽  
Epoxy Matrix ◽  
Corn Oil ◽  
Diglycidyl Ether ◽  
Diels Alder ◽  
Levopimaric Acid ◽  
Alder Adduct

Thermal and Dielectric Properties of Inorganic-Organic Nanocomposites Involving Epoxy Resin and Polyhedral Oligomeric Silsesquioxanes

2012 ◽  
Vol 476-478 ◽  
pp. 665-669 ◽  
Author(s):  
Li Yang ◽  
Miao Yin ◽  
Xiu Yun Li ◽  
Han Bing Ma
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Functional Groups ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Diglycidyl Ether ◽  
Polyhedral Oligomeric Silsesquioxanes

In this paper, a type of nanoporous polyhedral oligomeric silisesquioxanes (POSS) containing eight functional groups have been synthesized and mixed with diglycidyl ether of bisphenol A (DGEBA) to form epoxy resin networks with nanostructures. The cured octa(aminophenyl) silsesquioxane (1c-POSS) and DGEBA system inherently possesses higher thermal stability and higher char yield than the control epoxy resins. Furthermore, the dielectric constant of the 1c-POSS/DGEBA material (4.36) is substantially lower than that of the neat epoxy resins (4.64) as a consequence the presence of nanoporous POSS cubes in the epoxy matrix.

Rearrangements in the Diterpenoid Series. I. The Solvolysis of Methyl 15β-tosyloxy-13-isopropyl-17-noratis-13-en-18-oate

1973 ◽  
Vol 51 (1) ◽  
pp. 77-86 ◽  
Author(s):  
William A. Ayer ◽  
Pandurang D. Deshpande
Keyword(s):  
Diels Alder ◽  
Vinyl Ketone ◽  
Methyl Vinyl Ketone ◽  
Unsaturated Ketone ◽  
Methyl Vinyl ◽  
Levopimaric Acid ◽  
Alder Adduct

The synthesis of methyl 15β-hydroxy-13-isopropyl-17-noratis-13-en-18-oate (14b) is described. Compound 14b was prepared from the ketone 12b, in turn derived from the Diels–Alder adduct formed between levopimaric acid (7) and α-acetoxyacrylonitrile. Solvolysis of the tosylate of 14b proceeds predominantly with rearrangement and elimination to give methyl 16-isopropylidene-7,17-secoacon-8(15)-en-18-oate (16a). This rearrangement serves as a model for the proposed biosynthetic transformation of atisine-type alkaloids into alkaloids of the aconitine series. The degradation of 16a into the unsaturated ketone 19, which contains the 19 carbons of the aconane skeleton, is described. The Diels–Alder addition of methyl vinyl ketone to levopimaric acid is reported and the adduct is shown to possess structure 8.

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